דיפ סקוואט

[Ori-Silver]

אני מאוד אוהב לבצע סקוואט בדיפ ולרדת על שהתחת כמעט נוגע בריצפה אני ממש שונא את הגרסא שיורדים עד 90 מעלות בכל מקרה כבר כמה פעמים העירו לי על זה מאמנים שדי מבינים עניין שזה שוחק את הרצועות בברכיים האם יש אמת בדבר או שהם סתם מדברים שטויות?

[dstyle]

זה הרבה יותר יעיל לדעתי לעשות דיפ וככה מרגישים יותר עבודה, אבל אם מדריך רואה אותך ישר אומר לעשות ב90 מעלות כי זה פוגע בברכיים,אז כנראה אם הרבה אומרים וזה לא אחד או שני מאמנים שלא מבינים -זה נכון...מצטרף לשאלה אני רוצה לדעת גם למרות שאני מאמין שזה נכון אבל כשמדובר בעבודה ממושכת רצופה וארוכת טווח

[Amit]

דווקא אצלנו מאמנים מעודדים דיפ סקוואטים אבל מה שכן הוא באמת מסוכן יותר לברכים מסקוואט רגיל שים משקלים נורמלים ואל תשתגע תעלה משקל לאט לאט ויהיה בסדר עדיף לא לשחק עם פציעות..

[Bullet]

זה לא יותר מסוכן לפי דעתי.
עומס מכני גבוה על העצמות והגידים מסוכן בכל מצב. העניין הוא שהעומס צריך להיות על השרירים ולא על העצמות. (למשל, כשבן אדם קופץ ממקום גבוה, הוא לא מקפל הרבה את הרגליים-חלק מעוצמת המכה מועבר לעצמות. לעומת זאת, אם הוא יקפוץ ויקפל את הרגליים עד הסוף, יותר סיבי שריר יוכלו להמתח ולכן פחות מהמכה תעבור לעצמות).

אותו דבר אם מישהו עושה בנצ' פרס ומשחרר את השרירים בנקודה העליונה. המוט לא חייב ליפול, אפשר "לסדר" את הידיים ככה שהעומס יהיה על העצמות.

בדיפ סקוואט המון מתאמנים "משחררים" את השרירים בנקודה התחתונה. הם צריכים להיות מכווצים. כל עוד הם מכווצים השרירים נמצאים בעומס ולא העצמות. משקולנים אולימפיים עושים המון סקוואטים, ואין להם בעיות ברכיים...

לפחות ככה אני חושב.

[יאיר כהן]

אני עושה דיפ סקוואט
ואין לי שום בעיה אחי

[Leo]

יש אמת בדבר.
אם כי הבעייה גנטית לדעתי

[igorek]

תקראו ותשכילו:

Squat Theory and Execution

Written by “Arioch”





The squat should be a standard exercise in any lifters program. Whether the goal is strength, hypertrophy (increase in muscle size), increased accelerative ability, or a heightened vertical jump, the squat is the tool for the task. In addition to working the muscles of the legs, hips, lower back, abdomen, and obliques, the demands of squatting should stimulate a growth response from the body that will carry over into strength and size increases in other areas.

The basic technique of the squat consists in placing a loaded barbell across the shoulders, then bending at the hips and knees, descending into the bottom position, “the hole,” and returning to an erect position. We will examine the squat from the deck up.

Stance. This varies from individual to individual, but one thing is necessary for all who wish progress: you must keep your feet flat on the deck at all times. The center of gravity may be maintained over the center of the foot, but it is generally best to push through the heels. This will help in maintaining bar position and help eliminate a small degree of forward lean. To achieve this, some people find it necessary to curls the toes upward while squatting, forcing their heels flat. The feet should be placed at least shoulder width apart, and some individuals may best utilize a stance nearly twice shoulder width. The narrower stance tends to place more direct emphasis on the quads, and creates a longer path for the bar to travel. The wider stance (often called “sumo”) tends to be favored by many powerlifters, although some have enjoyed great success with a relatively narrow stance. The sumo stance place more emphasis on the adductors and hamstrings. As a rule of thumb, lifters with longer legs will need a wider stance than shorter individuals. However, there are exceptions. A wider stance will tend to recruit both the adductors and buttocks to a greater degree than a narrow stance. (1)

The shins should be a close to vertical as possible throughout the entire movement. This lessens the opening of the knee joint, and reduces the shearing force as well. By reducing the workload that the knee joint is required to handle, more of the work is accomplished by the larger muscles around the hip joint. For powerlifters, this decreases the distance one must travel with the bar, as the further the knee moves forward, the lower the hips must descend to break parallel.

There are several schools of thought on squat depth. Many misinformed individuals caution against squatting below parallel, stating that this is hazardous to the knees. Nothing could be further from the truth. (2) Stopping at or above parallel places direct stress on the knees, whereas a deep squat will transfer the load to the hips,(3) which are capable of handling a greater amount of force than the knees should ever be exposed to. Studies have shown that the squat produces lower peak tibeo-femoral(stress at the knee joint) compressive force than both the leg press and the leg extension.(4) For functional strength, one should descend as deeply as possible, and under control. (yes, certain individuals can squat in a ballistic manner, but they are the exception rather than the rule). The further a lifter descends, the more the hamstrings are recruited, and proper squatting displays nearly twice the hamstring involvement of the leg press or leg extension. (5,6) and as one of the functions of the hamstring is to protect the patella tendon (the primary tendon involved in knee extension) during knee extension through a concurrent firing process, the greatest degree of hamstring recruitment should provide the greatest degree of protection to the knee joint. (7) When one is a powerlifter, the top surface of the legs at the hip joint must descend to a point below the top surface of the legs at the knee joint.

Knee injuries are one of the most commonly stated problems that come from squatting, however, this is usually stated by those who do not know how to squat. A properly performed squat will appropriately load the knee joint, which improves congruity by increasing the compressive forces at the knee joint. (8,(9) which improves stability, protecting the knee against shear forces. As part of a long-term exercise program, the squat, like other exercises, will lead to increased collagen turnover and hypertrophy of ligaments. (10,11) At least one study has shown that international caliber weightlifters and powerlifters experience less clinical or symptomatic arthritis. (12) Other critics of the squat have stated that it decreases the stability of the knees, yet nothing could be further from the truth. Studies have shown that the squat will increase knee stability by reducing joint laxity, as well as decrease anterior-posterior laxity and translation. (13,14) The squat is, in fact, being used as a rehabilitation exercise for many types of knee injuries, including ACL repair. (15)

One of the most, if not the most critical factor in squatting is spinal position. It is incredibly important not to round the back. This can lead to problems with the lower back, and upper back as well. The back should be arched, and the scapulae retracted, to avoid injury. This position must be maintained throughout the entire lift, as rounding on the way up is even more common than rounding on the way down, and people who make this mistake are the ones who perpetuate the “squats are bad for your back” myth. Furthermore, spinal position is essential to maintaining a proper combined center of gravity (CCOG). The farther one leans forward or, even worse, rounds the back, the more strain the erectors are forced to bear, and the less the abdominals can contribute to the lift. To say nothing of the fact that the greater the lean, the greater the shearing force placed on the vertebrae. Proper spinal alignment will assist in ensuring that the majority of the force the spine must bear is compressive in nature, as it should be. Another reason for descending below parallel is that the sacrum undergoes a process known as nutation (it tilts forward, relative to the two ilia on either side of it). At only 90 degrees of knee flexion, the sacrum is still tilted backward, which inhibits proper firing of the erectors and gluteus maximus and minimus. Going through a full range of motion completes the rotation of the sacrum and allows maximal muscular recruitment.

“Squats are bad for your back” is yet another cry of the weak of both leg and spirit. While an improperly performed squat can cause problems, so can improperly performed barbell curl, yet many of the people who use the squat rack only to curl do not seem to have a problem strengthening their elbow flexors. While the squat can be hazardous to the back among the untrained who often incline the torso to an unsafe degree, as well as round the back, skilled athletes have been shown to minimize trunk segment torques by maintaining a more erect posture. (16) It has been positively shown that maintaining an upright torso during the squatting motion reduces both spinal compression and shear forces. (17) Several studies have shown that weightlifters experience not only less back injury and pain that many other athletes, but often even less than inactive individuals, which clearly displays that a proper weight training program, which includes squatting, is beneficial in avoiding injury. (18,19)

The placement of the bar is another very important consideration when squatting. If one places the bar high on the traps, more emphasis will be placed on the quads, and a low bar squat recruits more of the lower back and hamstrings, by virtue of back extension, simply because the lower the bar is placed, the greater the degree of forward lean. Even when high bar squatting, the bar should NEVER be placed on the neck. This is far more stress than the cervical vertebrae should be forced to bear. When a powerlifter squats with a low bar position, the bar should be placed no lower than three centimeters below the top of the anterior deltoids. For other lifters, comfort and flexibility will go a long way towards determining bar positioning. When gripping the bar, at first it is best to place your hands as close together as possible, to maintain tension in the upper back, and to avoid any chance of the bar slipping. As a general rule, the lower you place the bar, the wider your hands will have to be. Anything placed between the bar and the lifter, such as a pad or towel, decreases the force of friction and increases the chance of the bar slipping. It is to avoid injuries that this practice is banned in competition. Also, this will artificially raise the lifter’s CCOG, which makes it harder to balance under a heavy load.

[igorek]

המשך:

Look slightly upward when squatting, to avoid rounding the upper back. The movement should be initiated from the hips, by pushing the glutes back, not down. This will assist in keeping the shins vertical. On the way down, keep the torso as close to vertical as possible, continue to push the hips back, and push the knees out to the sides, avoiding the tendency to allow them to collapse inward. The manner in which the lifter descends will greatly influence the manner in which the ascent is made. When the necessary depth is achieved, begin ascending by pushing the head back, and continue to concentrate on pushing the knees outward.

One of the most common mistakes made while squatting, or performing any exercise for that matter, is improper breathing. At first, the lifter should inhale on the way down, and exhale on the way up. Many advanced lifters will take several large breaths, hold it all in on the way down, and then exhale forcefully at their sticking point on the way up. This technique, known as the “Partial Valsalva,” requires practice like any other.

There are many other types of squats, but all of them are secondary to the squat itself, which is appropriately termed the “King of Exercises.”

The front squat is performed in a similar manner, but the bar is held in the clean position, across the anterior deltoids, not the clavicles. The hands should be slightly wider than shoulder width, and the elbows should be elevated as much as possible. The bar is maintained as high as possible by elevating the elbows. This allows the lifter to maintain a more upright posture, and increases the emphasis on the glutes, while lessening the involvement of the lower back. This exercise may allow a lifter who lacks the flexibility required to perform a full squat achieve a reasonable depth while improving flexibility. The front squat will place far more emphasis on the quadriceps muscles and less recruitment of the hamstrings takes place. 7 (20) When comparing the squat to other exercises, it is important to note that the squat causes less compressive force to the knee joint, and greater hamstring activation, than both the leg press and the leg extension. (21)

[igorek]

המשך:

Another popular type of squatting exercise is the split squat (“lunge”). In this type of squat, the legs are placed at approximately shoulder width, but one foot is out in front of the athlete and one is placed to the rear, as if a lifter has just completed the jerk portion of the clean and jerk. The athlete descends by bending the front leg until the knee is slightly forward of the toes. The shin of the front leg should be ten degrees past perpendicular to the floor. It is important to maintain an upright posture when doing so. As when squatting, co-activation of the hamstring serves to protect the knee joint during flexion, (22) which is very important as often a greater degree of flexion will occurring when performing the split squat.

Certain misinformed and so-called “personal trainers” will have people squat in a smith machine, which is, quite simply, an idea both hideous and destructive. This is often done under the misguided “squat this way until you are strong enough to perform a regular squat” premise. Even if one overlooks the obvious fact that it is better to learn to do something right than build bad habits from the start, there are numerous other factors to be considered. The smith machine stabilizes the bar for the lifter, which does not teach the skill of balancing the bar, balance being important to any athlete, as well as the fact that free weight squatting strengthens the synergists which goes a long way to preventing injuries. A chain is only as strong as its weakest link, and the smith machine leaves far too many weak links. To say nothing of the fact that free weights provide a greater transfer of functional strength than machines. (23)Furthermore, the bar moves straight up and down, and very few people squat in this manner, which means that the smith machine does not fit a lifters optimal strength curve. (24) The smith machine also requires that the lifter either squats with his torso much closer to vertical than would be done with a real squat, which mechanically decreases the involvement of both the spinal erectors and the hamstrings. While this would be fine if it was done by the lifters muscular control, when the smith machine does this it is disadvantageous to the lifter by virtue of decreasing the ability of the hamstrings to protect the knee joint. Another mistake made, aside from simply using it in the first place, is allow the knees to drift forward over the toes, the chance of which is increased by the smith machine. As was previously mentioned, this greatly increases the shearing force on the knees. This from a device touted by the ignorant as “safe.”

There is a great debate about the use of belts when squatting, some sources insist that you must wear one, while others state quite the opposite. It is worth noting that there are plusses and minuses to wearing one. Using a proper belt while squatting can serve to increase intra-abdominal pressure (IAP) which will serve to stabilize the spinal column, reducing compressive forces acting upon the spine and reducing back muscle forces. (25) However, muscle activity of the trunk appears to be significantly reduced when using a weight belt, which can lead to the muscles of the trunk receiving a less than optimal stimulus when using a belt. (26) Other proponents of belt use have shown that the use of a properly designed power belt may improve a lifter's explosive power by increasing the speed of the movement without compromising the joint range of motion or overall lifting technique. (27)

There are numerous methods of utilizing the squat in any athlete’s training program. While a variety of rep and set ranges are optimal for a bodybuilder who wishes to maximize hypertrophy, an athlete’s must carefully plan a training program to meet their goals. Even though squatting will lead to gains in size, strength, and jumping ability, the more specific the program, the greater the results. When an untrained subject begins lifting, numerous programs produce gains in practically all areas, but this changes rapidly, with limited progress being made unless something is altered. (28)

To utilize the squat to gain in size is both simple and complex. Individuals will respond to a variety of rep ranges in different manners based on fiber type, training history, biomechanics, injuries, etc. Bodybuilders, who are concerned exclusively with gains in size, should squat heavy, as fast-twitch muscle fibers have the greatest potential for hypertrophy. However, sarcoplasmic hypertrophy (growth of muscle tissue outside of the sarcoplasmic reticulum) will contribute to overall muscular size, and is obtained by training with lighter weights and higher reps. Rate of training is once again an individual decision, but as a general rule, the greater the volume of training, including time under tension (TUT) per workout, the longer one must wait before recovery is optimized, allowing supercompensation to take place. A word of caution about performing higher repetitions while squatting: As the set progresses, the degree of forward lean increases. While this is desirable to increase the stress on the hamstrings, it takes the emphasis off of the quadriceps, as well as increases the risk of injury. (29)

[igorek]

.......

An athlete wishing to improve his vertical jump should not only squat, but perform a variety of assistance work specific to both improving squatting strength as well as specifically improving jumping skill. As jumping requires a great expenditure of force in a minimal amount of time, exercises such as squatting should be performed to increase muscle power, as muscle cross-sectional area significantly correlates to force output. (30) When wishing to increase one’s power through squatting to assist in the vertical jump, one must train to generate a high degree of force.(31 ,32 ,33 ) This is done by squatting a dynamic manner, where one is attempting to generate a large amount of power while using submaximal weights. This has been shown to provide a great training stimulus for improving the vertical jump. (34) A program consisting of a session once-weekly heavy squatting, ballistic lifting, and plyometric training, with each being performed during a separate workout, should provide maximal stimulus while allowing maximal recovery and supercompensation.(35,36)

When training to improve one’s overall squatting ability, expressed as a one-repetition maximum (1rm), once again a variety of programs may be utilized. The most common is a simple periodized program where, over time, the training weight is increased and the number of repetitions decreases. This sort of program is utilized by both Weightlifters and Powerlifters alike. A sample periodized program is included in Appendix B. Some sources state that you must train to failure, while others state that one should train until form begins to break down, leaving a small reserve of strength but reducing the risk of injury. It should be stated that there is no evidence that indicates training to failure produces a greater training stimulus than traditional volume training.

Far and away the most complicated, and controversial training program is the conjugate training method. Using this method one trains to develop maximal acceleration in the squat during one workout, and in another workout (72 hours later) generate maximum intensity in a similar exercise to the squat. This is based on an incredibly lengthy study by A. S. Prelepin, one of the greatest sports physiologists of the former Soviet Union. (37) This method also uses the practice of compensatory acceleration, where an athlete attempts to generate as much force as possible, by not only generating maximal acceleration, but by continuing to attempt to increase acceleration as the lifter’s leverage improves. The addition of chains or bands can increase the workload as well as force the athlete to work harder to accelerate the bar. Utilizing this system, the squat is trained for low repetitions (2) but a high number of sets (10 – 12), with training intensities being 50 – 70% of the athlete’s 1rm. Rest periods are short (45 – 75 seconds), and the squats are often performed on a box, which breaks up the eccentric-concentric chain, and inhibits the stretch reflex, forcing the athlete to generate the initial acceleration out of the bottom of the lift without the benefit of the elasticity of the muscle structure.

During the second workout, an exercise which taxes the muscles recruited when squatting, but not an actual squat, is performed for very low repetitions (1-3, usually one). The goal on this day is to improve neuromuscular coordination by increased motor unit recruiting, increased rate coding, and motor unit synchronization. This allows the athlete to continue to generate maximal intensity week after week, but by rotating exercises regularly optimal performance is maintained. For one microcycle, a squat-like exercise is performed, such as a box squat, rack squat, or front squat is performed, then the athlete switches to a different type of exercise, such as good mornings, performed standing, seated, from the rack, etc. for another microcycle, then switches exercises again, often to a pulling type exercise such as deadlifts with a variety of stances, from pins, from a platform, or any number of other variations. Once again, chains or bands may be added to increase the workload. A sample training program is included in Appendix B, and a variety of maximal effort exercises can be found in Appendix C.

Assistance work for the squat is of the utmost importance. The primary muscles which contribute to the squat, in no particular order, are the quadriceps, hamstrings, hip flexors/extensors, abdominals, and spinal erectors. When an athlete fails to rise from the bottom of a squat, it is important to note that not all of the muscles are failing simultaneously. Rather, a specific muscle will fail, and the key to progress is identifying the weakness, then strengthening it. A partial list of assistance exercises is provided in Appendix D. While it is impossible to simply state that if x happens when squatting, it is muscle y that is causing the problem, some general guidelines follow. If a lifter fails to rise from the bottom of a squat, it generally indicates either a weakness in the hip flexors and extensors, or a lack of acceleration due to inhibition of the golgi tendon organ (no stretch reflex – train with lighter weight and learn to accelerate if this is the case). If an athlete has a tendency to lean forward and dump the bar overhead, it generally indicates either weak hamstrings or erectors. If an athlete has trouble stabilizing the bar, or maintaining an upright posture, it is often due to a weakness in the abs.

The above factors assume that proper technique is being maintained. If this is not the case, no amount of specific work will overcome this problem. Drop the weight and concentrate on improving skill, which is far more important than training the ego, and less likely to lead to injury.

Safety is the key issue when squatting, or performing any lift. With a few simple precautions, practically anyone may learn to squat, and do so quite effectively. The rewards are well worth the effort. Squat heavy, squat often, and above all, squat safely.

[igorek]

........

1 Stance width and bar load effects on leg muscle activity during the parallel squat. McCaw ST; Melrose DR Med Sci Sports Exerc, 31(3):428-36 1999 Mar

2 Ariel, B.G., 1974. Biomechanical analysis of the knee joint during deep knee bends with a heavy load. Biomechanics. IV(1):44-52.

3 High- and low-bar squatting techniques during weight-training. Wretenberg P; Feng Y; Arborelius UP, Med Sci Sports Exerc, 28(2):218-24 1996 Feb

4 An analytical model of the knee for estimation of internal forces during exercise. Zheng N; Fleisig GS; Escamilla RF; Barrentine SW, J Biomech, 31(10):963-7 1998 Oct

5 Biomechanics of the knee during closed kinetic chain and open kinetic chain exercises. Escamilla RF; Fleisig GS; Zheng N; Barrentine SW; Wilk KE; Andrews JR Med Sci Sports Exerc, 30(4):556-69 1998 Apr

6 A comparison of tibiofemoral joint forces and electromyographic activity during open and closed kinetic chain exercises. Wilk KE; Escamilla RF; Fleisig GS; Barrentine SW; Andrews JR; Boyd ML Am J Sports Med, 24(4):518-27 1996 Jul-Aug

7 Chandler TJ and Stone MH. (1991) The squat exercise in athletic conditioning: a review of the literature. NSCA Journal. 13(5): 58-60.
8 Hsieh, H. and P.S. Walker. 1976. Stabilizing mechanisms of the loaded and unloaded knee joint. Journal of Bone and Joint Surgery. 58A(1):87-93.

9 Uhl, T.L. and P.V. Loubert. 1990. Axial compression effect on anterior displacement of the in vivo tibeofemoral joint. Master’s thesis, University of Michigan, Ann Arbor, MI.

10 Shankman, G. 1989. Training guidelines for strengthening the injured knee: basic concepts for the strength coach. NSCA Journal. 11(4):32-42.

11 Tipton, C.M., Matthes, R.D., Maynard, J.A. and Carey, R.A. 1975. The influence of physical activity on ligaments and tendons. Medicine and Science in Sports. 7(3):165-175.

12 Herrick, R.T., Stone, M.H. and Herrick, S. 1983. Injuries in strength-power activities. Powerlifting USA. 7(5):7-9.

13 Panariello, R.A., Backus, S.I., and Parker, J.W. 1994. The effect of the squat exercise on anterior-posterior knee translation in professional football players. American Journal of Sports Medicine. 22(6):768-773.

14 Steiner, M.E., Grana, W.A., Chillag, K., and Schelberg-Karnes, E. The effect of exercise on anterior-posterior knee laxity. 1986. American Journal of Sports Medicine. 14(1): 24-29.

15 Palmitier, R.A., Kai-Nan, A., Scott, S.G., and Chao, E.Y.S. 1991. Kinetic chain exercise in knee rehabilitation. Sports Medicine. 11(6):402-413.

16 McLaughlin, T.M., Lardner, T.J., and Dillman, C.J. 1978. Kinetics of the parallel squat. Research Quarterly. 49(2):175-189.

17 Garhammer, J. 1989. Weight lifting and Weight Training. In: Biomechanics of Sport, chapter 5, C.L. Vaughan, ed. Boca Raton FL: CRC Press. Pp. 169-211.

18 Granhed, H. and Morelli, B. 1988. Low back pain among retired wrestlers and heavyweight lifters. American journal of Sports Medicine. 16(5):530-533.

19 Kulund, D.N., Dewey, J.B., Brubaker, C.E., and Roberts, J.R. 1978. Olympic Weightlifting Injuries. Physician and Sports Medicine. 6(11):111-119.

20 A preliminary comparison of front and back squat exercises [see comments] Russell PJ; Phillips SJ Res Q Exerc Sport, 60(3):201-8 1989 Sep

21 J Biomech 1998 Oct;31(10):963-7 An analytical model of the knee for estimation of internal forces during exercise. Zheng N, Fleisig GS, Escamilla RF, Barrentine SW

22 Biomed Sci Instrum 1997;33:360-5 Co-activation of the hamstrings and quadriceps during the lunge exercise. Hefzy MS, al Khazim M, Harrison L

23 Stone, M. H., Johnson, R. L., & Carter, D. R. (1979). A short-term comparison of two different methods of resistance training on leg strength and power. Athletic Training, 14, 158-160.

24 Phys Ther 1995 Feb;75(2):133-44 Neuromuscular coordination of squat lifting, II: Individual differences. Scholz JP, McMillan AG

25 Lander, J.E., Hundley, J.R., and Simonton, R.L. The effectiveness of weight-belts during multiple repetitions of the squat exercise. Med Sci Sports Exercise. 24(5):603-609. 1992.

26 The Effectiveness of Weight-belts During the Squat Exercise. Lander, JE, Simonton, RL, and Giacobbe JKF. Med Sci Sports Exercise. 22(1):117-126. 1990.

27 Attila J. Zink, William C. Whiting, William J. Vincent, and McLaine, A.J. The effects of a weight belt on trunk and leg muscle activity and joint kinematics during the squat exercise. 1999. Journal of Str Con Res.

28 Influence of two different modes of resistance training in female subjects. Hisaeda H; Miyagawa K; Kuno S; Fukunaga T; Muraoka I

29 Lander, JE, Hundley, JR, and Simonton, Rl. The Effectiveness of weight-belts during multiple repetitions of the squat exercise. Med Sci Sports Exerc. 24(5): 603-609. 1992.

30 Force-velocity relationships and fatigability of strength and endurance-trained subjects. Kanehisa H; Ikegawa S; Fukunaga T
Choi, J. Y., Takahashi, H., Itai, Y., & Takamatsu, K. (1997).

31 Comparison of training effects between power-up type and bulk-up type in strength training. Medicine and Science in Sports and Exercise, 29(5), Supplement abstract 54.

32 Hellebrandt, F. A. (1972). The physiology of motor learning. In R. N. Singer (Ed.), Readings in motor learning (pp. 397-409). Philadelphia, PA: Lea & Febiger.

33 Christina, R. W. (1996). Major determinants of the transfer of training: Implications for enhancing sport performance. In K-W. Kim (Ed.), Human performance determinants in sport (pp. 25-52). Seoul, Korea: Korean Society of Sport Psychology.

34 Wilson, G. J., Newton, R. U., Murphy, A. J., & Humphries, B. J. (1994). The optimal training load for the development of dynamic athletic performance. Medicine and Science in Sports and Exercise, 25(11), 1279-1286.

35 Morrissey, M. C., Harman, E. A., & Johnson, M. J. (1995). Resistance training modes: Specificity and effectiveness. Medicine and Science in Sports and Exercise, 27, 648-660.

36 Kraemer, W. J., & Newton, R. U. (1994). Training for improved vertical jump. Sports Science Exchange, 7(6), 1-12.

37 A. S Prelepin. 1969. Preparation of :):):):):) Soviet Athletes. Technical Report #1012-62, Moscow: All-Union Research Institute of Physical Culture.





Appendix A: Anatomical References



Trapezius (i): The lower half of the trapezius (“traps 3” and “traps 4”) assist in retracting the scapulae and maintaining proper alignment of the cervical and thoracic vertebrae. The Trapezius also assist in maintaining the head in an erect position. This serves to secure the bar in a stable position on the upper back, as well as maintain a proper arch in the upper back (thoracic vertebrae).

[igorek]

.........

The Levator Anguli Scapulae, Rhomboideus major(b), and Rhomboideus minor all function to retract the scapulae, maintain alignment of the cervical vertebrae, retract the scapulae, and maintain proper position of the shoulder girdle while support a fixed load (barbell). Levator not shown, inferior to the scapulae(g). These muscles are of the utmost importance in maintaining the bar position while squatting.

Latissimus dorsai: These wide muscles which cover the lumbar and lower half of the dorsal regions will contract isometrically to avoid compression of the shoulder girdle. They assist in maintaining rigidity in the spinal column, which allow proper arching (lordosis) of the spine while squatting.

The Erector spinae(1), Sacro-lumbalis(b), Longissimus Dorsi(2_, and Spinalis Dorsi(3) all serve to maintain the spine in the erect posture. They also serve to bend the trunk backward when it is required to counterbalance a weight such as when squatting. Numerous smaller muscles function to stabilize the spinal column during back extension, by contracting to maintain vertebral alignment. It should be noted that during a heavy squat, the erectors and their synergists will be quite heavily taxed. Due to the need for the athlete-barbell system to maintain a proper combined center of gravity (CCOG), there will be a certain amount of forward inclination of the trunk taking place, to maintain barbell position over the athlete’s base of support (the foot).

The abdominals: The Rectus(f), Obliques internus(c ), Obliques externus(b), Transersalis(d), Pyramidalis, and Quadratus lumborum all contract isometrically to support the trunk under a compressive load. Pyramidalis (not shown) is a small triangular muscle sheathed within the base of the rectus.

Serratus posticus superior and inferior: Both assist in maintaining rigidity in the torso by contracting isometrically to support the chest cavity as well as providing support for the lumbar vertebrae. Figure Four: Serratus superior (g). Not shown, inferior, below superior.

The intercostals: External intercostals(1), Internal intercostals, Infracostals, Triangularis sterni, and Leytores costarum all contract isometrically to stabilize the ribcage under a compressive load. Only externals are indicated. Other muscles in this group are inferior to the Externals.

The Glutei function to adduct the thigh. The Gluteus maximus(c ) and medius(2) rotate the thigh outward, and the minimus(1) rotates it inward. The Gluteus maximus extends the femur and brings the bent thigh into a line with the body. The Gluteus medius and minimus flex the thigh. The Glutei also function to achieve an erect posture after squatting.

The hamstrings, which consist of the Biceps Femoris(g), Semimembranosus(i), and Semitendinosis(h), serve to flex the knee. They also function to extend the torso, such as when rising from a squatting position. The Semitendinosus and, to a lesser extent, the Semimembranosus, assist in rotating the thigh inward.

The Illiacus(o), Psoas magnus(c), and Psoas parvus(q) (often called the illio-psoas muscle group), acting from above, flex the thigh upon the pelvis, and at the same time rotate the femur outward. Acting from below, the femur being fixed, the muscles of both sides bend the lumbar portion of the spine and pelvis upon the femur. They also serve to maintain the erect position by supporting the spine and pelvis upon the femur.


The Quadriceps function to extend the knee joint, while the Sartorius flexes the leg upon the thigh and the thigh upon the pelvis. Rectus (1), Vastus Externus (2), Vastus Internus (“medialis")(3), Sartorius (c ). When the knee is bent the Sartorious assists the Semitendinosis in rotating the tibia inward. The Rectus assists the Psoas and Iliacus in supporting the pelvis upon the trunk upon the femur.


The Pectineus(f), the Adductor Brevis (g), the Adductor Longus (h), and the Adductor Magnus (not shown, inferior to the other adductors) powerfully adduct (move inward) the thigh. The Pectineus and Adductor Brevis and Longus assist the Psoas and Illiacus in flexing the thigh upon the pelvis. The Gracilis (I) assists the Sartorius in flexing the leg and rotating it inward, it is also an adductor of the thigh.



Appendix B: Sample Training Programs

Basic Periodized Program:
Week One: Squat 50% 1rm, three sets, 10 reps.
Week Two: Squat 55% 1rm, three sets, 10 reps.
Week Three: Squat 60% 1rm, three sets, 8 reps.
Week Four: Squat 65% 1 rm, three sets, 8 reps.
Week Five: Squat 70% 1 rm, three sets, 8 reps.
Week Six: Squat 75% 1 rm, three sets, 5 reps.
Week Seven: Squat 80% 1rm, three sets, 5 reps.
Week Eight: Squat 85% 1rm, three sets, 3 reps.
Week Nine: Squat 90% 1rm, three sets, 3 reps.
Week Ten: Squat 95% 1 rm, three sets, 2 reps.
Week Eleven: Squat 100% 1rm, three sets, 1 rep.
Week Twelve: Squat 105% of previous 1 repetition maximum for one repetition.

Basic Conjugate Training Program:
Each workout is performed once a week for a three week microcycle.
Day One: Maximal Acceleration:
Box squat: 10 sets, 2 reps, 50% 1rm.
Box squat: 2 sets, 2 reps, 60% 1rm.
Arched Back Good Mornings: 3 sets, 5 reps.
Reverse Hyper Extensions: 3 sets, 8 reps.
Russian Twist: 3 sets, 10 reps.
Seated Calf Raise: 3 sets, 15 reps.

Day Two: Maximal Effort, performed 72 hours later:
Front Squat from low box: 1rm.
Glute-Ham Raise: 3 sets, 5 reps.
Reverse Hyper Extensions: 3 sets, 10 reps.
Weighted Sit Ups: 3 sets, 8 reps.
Calf Raise: 3 sets: 10 reps.

Repeat for three weeks (total) and then switch to:
Day One:
Box Squat: 10 sets, 2 reps, 55% 1rm.
Box Squat: 2 sets, 2 reps, 65% of 1rm.
Pull Throughs: 3 sets, 12 reps.
Reverse Hyper Extensions: 3 sets, 6 reps.
Hanging Leg Raise: 4 sets, 12 reps.
Donkey Calf Raise: 3 sets, 8 reps.

Day Two:
Sumo Deadlift with plates 6” off floor (lower by 2” each week for the next two weeks): 1rm
Split Squat: 3 sets, 5 reps.
Reverse Hyper Extensions: 3 sets, 10 reps.
Weighted Side Bend: 3 sets, 10 reps.
Calf Press: 3 sets, 10 reps.

After three weeks, again rotate exercises.

Appendix C: Partial List of Maximal Effort Exercises

Squatting Exercises:
Low Box Squat
High Box Squat
(either lift may be performed with one of the following:
Buffalo Bar
Manta Ray
Cambered Squat Bar)
Saftey Squat Bar)
Chains or bands may be added.
Low Box Front Squat (modified as above)
Good Morning Squat
Overhead Squat(may be performed off a box, with a variety of stances.
Zercher Squat

Pulling Exercises:
Conventional Deadlift
Sumo Deadlift
(either lift may be performed from a variety of pin heights in the power rack)
Deadlift from platform
Zercher Deadlift
Trap Bar Deadlift
Clean Pulls
Snatch Pulls
Snatch Grip Deadlift (may be done from various heights)

Good Mornings:
Arched Back
Round Back (Only for advanced lifters. If you are not sure, you are not advanced.)
Seated
Good mornings on floor with legs outstretched
(all may be modified as per the squat)
Good mornings can also be performed to various pin heights in the power rack.





Appendix D: Partial List of Assistance Exercises


Exercises for the lower back and hamstrings:
Good Mornings(see Appendix C)
Glute Ham Raise
High Repetition Deadlifts (done with glutes pushed to the rear, only lowered to just below knee level)
Reverse Hyper Extensions
Pull Throughs

Exercises for the hamstrings:
Manual Hamstring Curl
Leg Curls (this is the least effective of the entire list)

Exercises for the Hip Flexors:
Kneeling Squats
Ultra-Wide Sumo Deadlifts
Overhead Squats done to a low box with a sumo stance
Spread Eagle Sit Ups
Heavy Step Ups

Exercises for the Abdominals:
Weighted Sit Ups
Medicine Ball Throws on decline board
Standing Ab Pulldowns
Ab Bench
Hanging Leg Raise

Exercises for the Obliques:
Russian Twist
Weighted Side Bends
Atlas Twist
Weighted Sit Ups on decline board with twist

Exercises for the Quads:
Belt Squats
Split Squats
Front Squats



Bibliography:

Supertraining: Siff and Verkoshansky, 1999.

Physiology of Sport and Exercise, Wilmore and Costill, 1994. Human Kinetics.

Science and Practice of Strength Training, V. M. Zatsiorsky, 1995. Human Kinetics.

The Weightlifting Encyclopedia, A. Drechsler, 1998. A is A publications.

Gray’s Anatomy, H. Gray, 1998. House of Collectables.

The Training of the Weightlifter, R. A. Roman, 1988. Sportivny Press.

A System of Multi-Year Training in Weightlifting. A. S. Medvedyev, 1989. Sportivny Press.

Power: A Scientific Approach. F. C. Hatfield, 1989. Contemporary books.

Squatting, Westside Style, Dave Tate, 2000. :):):):):) Fitness Systems.

Biomechanics of Sport. J. Garhammer, 1989. CRC Press.

Designing Resistance Training Programs. S. J. Fleck and W. J. Kraemer, 1987. Human Kinetics.

Weight Training: A Scientific Approach. M. H. Stone and H. S. O’Bryant, 1987. Bellwether Press.

[- Idan -]

שטויות במיץ עגבניות.

אם אתה שואל אותי, זה מיתוס שהתפתח ממתאמנים כוסיות שפחדו לרדת מתחת ל-90 מעלות.
יש עובדות פזיולוגיות, והעובדות האלה מצביעות על כך שדיפ סקוואט לא יכול להיות מסוכן יותר לברכיים מסקוואט 90 מעלות, נקודה. טווח התנועה המלא של הברך קיים בכל מקרה, אז למה להגביל אותו? אתה לא רואה אנשים עושים לחיצה צרפתית עד שהמרפק מגיע ל-90 מעלות, נכון? אתה לא רואה אנשים שעושים פשיטות ברכיים במכונה עד למצב של 90 מעלות, נכון?
דבר שני, בסקוואט 90 מעלות המומנט לברך הוא גדול יותר ולכן גם העומס לברך גבוה יותר. אז אני לא אומר שסקוואט 90 מעלות בעל פוטנציאל גבוה יותר לפציעות (למרות שיש כאלה שבאמת טוענים ככה), אבל זה לגמרי מפריך את זה שדיפ סקוואט מסוכן לברכיים.
דבר שלישי, ככל שיורדים יותר עמוק, יותר עומס נופל על ה- Posrerior muscel chain, כלומר השרירים שנמצאים בצד האחורי של הגוף (תחת, ירך אחורית, זוקפי גב) ולכן באופן טבעי זה אותו עומס שיורד מהברכיים, ולא להיפך.

מקווה שהצלחתי לשכנע אותך, שהמאמנים האלה (שאני לא ממעיט בערכם), כנראה בסקוואט לא מתמצאים הרבה מהסיבה שוינגייט מזדחל מאחור בכל הנוגע לתרגילים מהסוג הזה (סקוואט, דד ליפט שאגב אפילו לא מלמדים שם, שלא נדבר על הנפות אולימפיות).

[igorek]

http://forum.:):):):):):):):):):):):):):):):):)/showth...threadid=68739

[NIRAN]

שאני עושה ראווז במכון המדריך שואל אותי מה זה חחחחח

[Troya]

פורסם במקור על ידי NIRAN

שאני עושה ראווז במכון המדריך שואל אותי מה זה חחחחח

חחחחחחחחח יש הרבה מפגרים כאלה

[Leo]

את האמת אני לא יכול לרדת מתחת ל100 מעלות בתרגילים שונים לטריספס כי יש לי קליקים במרפקים ( וכאבים) בגלל שהתרגלתי לאמן טריספס מנעילות , (ולא עשיתי את התרגילים הפשוטים לטריספס נכון)

אבל זה עובר ( לאט לאט)