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ישן 18-02-07, 23:41   #1
igorek
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ברירת מחדל שימוש בחגורות - דר. סטוארט מקגיל (כתבה באנגלית)

דר. סטוארט מקגיל נחשב לאחד מבכירי חוקרי בריאות עמוד בשידרה בעולם. הנה מה הוא חושב על חגורות:
ציטוט:
On The Use of Weight Belts
By Stuart M. McGill, Professor of Spine Biomechanics, University of Waterloo, Canada

A review invited by the National Strength and Conditioning Association
March 2005, Revised Sept 05

Scientific studies regarding the use of belts for athletic endeavours is scarce. Much more evidence and insight exists for the use of belts in occupational settings. The relevant information from occupational usage is discussed in this article and is blended with the limited work on athletic/performance use to form a position statement. Given the assets and liabilities of belt wearing, they are not recommended for healthy individuals either in routine work or exercise participation. However, the temporary prescription of belts may help some individual workers return to work. The exception is for extreme athletic lifting where belts appear to increase torso stability to reduce the risk of buckling and provide some elastic extensor recoil to assist with the lift. But the possible liabilities underscore the counterpoint to this proposition. The individual must make their own informed decisions on whether or not to wear a belt although guidance is provided here for their prescription and use.

The average person must be confused when they observe both Olympic lifters and back-injured people wearing back belts. A review of the documented effects of belt wearing in occupational settings (McGill, 1993) would support that:

• Those who have never had a previous back injury appear to have no additional protective benefit from wearing a belt.
• Those who are injured while wearing a belt seem to risk a more severe injury.
• Belts appear to give people the perception they can lift more and may in fact enable them to lift more.
• Belts appear to increase intra-abdominal pressure and blood pressure.
• Belts appear to change the lifting styles of some people to either decrease the loads on the spine or increase the loads on the spine.

Other opinions have been expressed regarding the mechanisms of belts, although few hold up to scrutiny. For example, some have suggested that belts perform the following functions:

• Remind people to lift properly
• Support shear loading on the spine that results from the effect of gravity acting on the handheld load and mass of the upper body when the trunk is flexed
• Reduce compressive loading of the lumbar spine through the hydraulic action of increased intra-abdominal pressure associated with belt wearing
• Act as a splint on the torso, reducing the range of motion and thereby decreasing the risk of injury
• Provide warmth to the lumbar region
• Enhance proprioception via pressure to increase the perception of stability
• Reduce muscular fatigue
• Provide stiffening to the torso to enhance performance

Many of these remain contentious.

The Recreational/Occupational Use of Belts

While there are guidelines for belt wearing for occupational use, sporting use requires a different approach. Occupational use is based on the premise of injury risk reduction while sporting use includes performance enhancement – to lift more for example. Previous recommendations for occupational use (see McGill, 1993, 1999, 2004) presented data and evidence that neither completely supported, nor condemned, the wearing of abdominal/back belts. Given the available literature, it would appear that the universal prescription of belts (i.e., providing belts to all workers in an industrial operation) is not in the best interest of globally reducing the risk of injury. Uninjured workers do not appear to enjoy any additional benefit from belt wearing, and in fact may be exposing themselves to the risk of a more severe injury if they were to become injured. Moreover, they may have to confront the problem of weaning themselves from the belt. However, if some individual workers perceive a benefit from belt wearing, they may be allowed to wear a belt conditionally, but only on trial. Having considered the scientific evidence for belt wearing for occupational and athletic use that the mandatory conditions for occupational/recreational prescription (for which there should be no exception) are as follows:

1. Given the concerns regarding increased blood pressure and heart rate and issues of liability, all candidates for belt wearing should be screened for cardiovascular risk by medical personnel.
2. Given the concern that belt wearing may provide a false sense of security, belt wearers must receive education on lifting mechanics. All too often, belts are being promoted as a quick fix to the injury problem. Promotion of belts, conducted in this way, is detrimental to the goal of reducing injury as it redirects the focus from the cause of the injury. Education programs should include information on how tissues become injured, techniques to spare the back, and what to do about feelings of discomfort to avoid disabling injury.
3. Consultants should not prescribe belts until they have conducted a full ergonomic assessment of the individual’s job, or a very thorough analysis of their training/lifting technique. Belts are no substitute for poor lifting technique. The ergonomic approach should examine, and attempt to correct, the cause of the musculoskeletal overload and provide solutions to reduce the excessive loads.
4. Belts should not be considered for long-term use. The objective of any small-scale belt program should be to wean workers from the belts by insisting on mandatory participation in comprehensive fitness programs and education on lifting mechanics, combined with ergonomic assessment. Furthermore, consultants would be wise to continue vigilance in monitoring former belt wearers for a period of time following belt wearing, given that this period appears to be characterized by an elevated risk of injury.
5. An analysis of the anatomy and biomechanics of the torso shows that there is a natural belt formed by the abdominal wall and the lumbodorsal fascia. Training the core musculature enhances the stabilizing effect of the “natural belt” by both strengthening the core and improving the motor control of these muscles so that they work as a team to enhance back stability.

Belt use for Serious Lifting Athletes

Much of the occupational evidence has relevance for athletic use of belts. There is no question that belts assist in generating a few more Newton-meters (or foot-pounds) of torque in the torso through elastic recoil of a bent torso that is stiffened with a belt. However, if a neutral spine is preserved throughout the lift this effect is diminished. In other words, to obtain the maximal effect from a belt, the lifter must lift poorly and in a way that exposed the back to a much higher risk of injury! There is no question that belts assist in generating torso stiffness to reduce the risk of spine buckling in extreme heavy lifts. Many athletes working at this edge of the envelope will receive this assist. However, other techniques are employed to maximize the torso stiffness – the lungs are filled to almost the top of tidal volume and the breath is then held. In some tasks, an athlete will only “sip” the air never allowing much air to leave the lungs that would reduce torso stiffness. Belts also increase intra-abdominal pressure which in turn increases the CNS fluid pressure in the spine and, in turn, the brain. This decreases the transmural gradient (the pressure difference between the arterial blood pressure in the brain vessels and the brain itself) which in turn may reduce the risk of aneurysm, or stroke. Others have argued that this effect has detrimental implications for venous return to the heart. There appears to be no evidence to suggest where the balance lies on this issue. There are other counter considerations. Evidence suggests that people change their motor patterns, together with their motion patterns when using a belt. The evidence suggests that these motor control changes can elevate the risk of injury should a belt not be worn in a belt-training athlete. The severity of a back injury may be greater if a belt is worn.
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ישן 18-02-07, 23:42   #2
igorek
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ציטוט:
Many people adopt belts in training for one of three reasons:

• They have observed others wearing them and have assumed that it will be a good idea for them to do so.
• Their backs are becoming sore and they believe that a back belt will help.
• They want to lift a few more pounds.

None of these reasons are consistent with the objective of good health. It would appear that if one must lift a few more pounds, wear a belt. If one wants to groove motor patterns to train for other athletic tasks that demand a stable torso, it is probably better not to wear one. Instead individuals are encouraged to train the core musculature and to perfect lifting technique.

Natures Belt – A brief review of the anatomy

The abdominal wall formed by the lateral obliques (external and internal) and transverse abdominis creates hoop forces around the abdomen (see figure 1). These hoop forces are the reason why the rectus abdominis has a “beaded” appearance—the lateral tendons transmit the lateral forces from the oblique muscles forming a continuous hoop around the abdomen. Further the intermuscular tendons and rectus fascia prevent the fibers of rectus from being ripped apart laterally from these hoop stresses. Posteriorly, the obliques connect with the lumbodorsal fascia (LDF) completing the hoop, or belt. The resulting “hoop stresses” and stiffness assist with spine stability. Training of this mechanism has been extensively discussed in McGill (2004).

Scientific Studies

The scientific studies can be divided into clinical trials and those that examined biomechanical, psychophysical, and physiological changes from belt wearing.
Clinical Trials: Clinical trials have been conducted to examine the effectiveness of belts to reduce injury in workers who perform lifting tasks. These types of studies are difficult to conduct. For example, the Hawthorne effect is a concern, as it is difficult to present a true double-blind paradigm to participants since those who receive belts certainly know so. In addition, logistical constraints on duration, diversity in occupations, and sample size are problematic. However, the data reported in the better-executed clinical trials cannot support the practice of universal prescription of belts to all workers involved in industrial lifting to reduce the risk of low-back injury (for example, Reddell and colleagues, 1992, Mitchell and colleagues, 1994, Wassell and colleagues, 2000). Weak evidence suggests that those people already injured might benefit from belts with a reduced risk of injury recurrence. However, evidence does not appear to support uninjured workers wearing belts to reduce the risk of injury; in fact, the risk of injury seems to increase during the period following a trial of belt wearing. Finally, some evidence suggests that the cost of a back injury may be higher in workers who wear belts than in workers who do not.

Biomechanical Studies: Researchers who have studied the biomechanical issues of belt wearing have focused on spinal forces, intra-abdominal pressure (IAP), load, and range of motion. The most informative studies are reviewed in this section.

Two studies in particular (Harman et al.,1989, and Lander et al., 1992) suggested that wearing a back belt can increase the margin of safety during repetitive lifting. Both of these papers reported ground reaction force and increased intra-abdominal pressure while subjects repeatedly lifted barbells. It was only assumed that intra-abdominal pressure is a good indicator of spinal forces. However, several studies have questioned the hypothesized link between elevated intra-abdominal pressure and reduction in low back load. For example, using an analytical model and data collected from three subjects lifting various magnitudes of loads, McGill and Norman (1987) noted that a buildup of intra-abdominal pressure required additional activation of the musculature in the abdominal wall. This activity resulted in a net increase in low back compressive load and not a net reduction of load, as researchers had previously thought. In addition, Nachemson and colleagues (1986) published some experimental results that directly measured intradiscal pressure during the performance of Valsalva maneuvers, documenting that an increase in intra-abdominal pressure increased, not decreased, the low back compressive load. Therefore, the conclusion that an increase in intra-abdominal pressure due to belt wearing reduces compressive load on the spine seems erroneous. In fact, such an increase may have no effect or may even increase the load on the spine.

Several studies have put to rest the belief that IAP affects low back extensor activity. Our own study (McGill and colleagues, 1990) suggested that there was no change in activation levels of the low back extensors nor in any of the abdominal muscles (rectus abdominis or obliques).

Both Reyna and colleagues (1995) and Ciriello and Snook (1995) found belts provided no enhancement of function in terms of alleviating the loading of back extensor muscles or fatigue, but these trials were not conducted over a very long period of time.

Both Lantz and Schultz (1986) and McGill and colleagues (1994) observed the range of lumbar motions in subjects wearing low back orthoses and belts, respectively. Generally, the stiffness of the torso was significantly increased about the lateral bend and axial twist axes when belt wearing but not when subjects were rotated into full flexion.

A data set presented by Granata and colleagues (1997) supports the notion that some belt styles are better in stiffening the torso in the manner described previously—namely, the taller elastic belts that span the pelvis to the rib cage. Furthermore, these authors also documented that a rigid orthopedic belt generally increased the lifting moment, while the elastic belt generally reduced spinal load. Even in well controlled studies, belts appear to modulate lifting mechanics in some positive ways in some people and in negative ways in others.

Studies of Belts, Heart Rate, and Blood Pressure: Hunter and colleagues (1989) monitored the blood pressure and heart rate of five males and one female performing dead lifts and one-arm bench presses and riding bicycles while wearing and not wearing a 10-cm (4-in.) weight belt. During the lifting exercise, blood pressure (up to 15 mmHg) and heart rate were both significantly higher in subjects wearing belts. Given the relationship between elevated systolic blood pressure and an increased risk of stroke, Hunter and colleagues (1989) concluded that individuals who may have cardiovascular system compromise are probably at greater risk when undertaking exercise while wearing back belts than when not wearing them. Our own work (Rafacz and McGill, 1996) supports these conclusions. Anecdotally, belts and associated pressures may possibly be linked with higher incidents of varicose veins in the testicles, hemorrhoids, and hernias. As of this writing, there has been no scientific and systematic investigation of the validity of these suggestions. It may be prudent to simply state concern and test these ideas in the future.

Psychophysical Studies: Some scientists and coaches have expressed concern that wearing belts fosters an increased sense of security that may, or may, not be warranted. Studies based on the psychophysical paradigm allow subjects to select weights that they can lift repeatedly using their own subjective perceptions of physical exertion. For example McCoy and colleagues (1988) found that subjects were willing to lift by approximately 19% when wearing a belt. This evidence may lend some support to the theory that belts give people a false sense of security.

A Look to the future

Training for high performance usually requires high speed movement. Also critical for ultimate performance is timed and coordinated stiffness and joint stability. Consider the golf swing that epitomizes the contrast between controlled relaxed motion through the backswing and violent whole body stiffening at the instant of ball contact only to be followed by more relaxed follow through motion. The same contrast can be generalized for generating punching power and for the impressive “hit”in football, for example. The best athletes are able to generate motion but know when to stiffen with extremely rapid muscle activation together with rapid muscle relaxation. Techniques for training this skill involve selective plyometric exercise which is generally encumbered by wearing a belt. Thus, different considerations apply for speed training and belt usage is considered inappropriate.
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ישן 18-02-07, 23:43   #3
Nimrod
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תודה!!
מחר אקרא את זה 100%!
השרת של מורפיקס הולך ליפול..
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"החיטוב שלך זה 80% תזונה
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ג'אי קטלר במסה (תמונה חדשה) :
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מני = מלך ישראל! (חי חי וקיים)
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ישן 18-02-07, 23:43   #4
igorek
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המשך:
ציטוט:
Note: Adapted from thechapter on back beltsby Stuart McGill in:“Ultimate Back Fitness and Performance”, Wabuno publishers, 2004, Canada. Available from www.backfitpro.com

References
Ciriello, V.M., and Snook, S.H. (1995) The effect of back belts on lumbar muscle fatigue. Spine, 20 (11):1271-1278.
Granata, K.P., Marras, W.S., and Davis, K.G. (1997) Biomechanical assessment of lifting dynamics, muscle activity andspinal loads while using three different style lifting belts. Clin. Biomech, 12 (2): 107-115.
Harman, E.A., Rosenstein, R.M., Frykman, P.N., and Nigro, G.A. (1989) Effects of a belt on intra-abdominal pressure during weight lifting. Med. Sci. Sports Exercise, 2 (12): 186-190.
Hunter, G.R., McGuirk, J., Mitrano, N., Pearman, P., Thomas, B., and Arrington, R. (1989) The effects of a weight training belt on blood pressure during exercise. J. Appl. Sport Sci. Res., 3 (1):13-18.
Lander, J.E., Hundley, J.R., and Simonton, R.L. (1992) The effectiveness of weight belts during multiple repetitions of the squat exercise. Med. Sci. Sports Exercise, 24 (5): 603-609.
Lantz, S.A., and Schultz, A.B. (1986) Lumbar spine orthosis wearing. I. Restriction of gross body motion. Spine, 11 (: 834-837.
McCoy, M.A., Congleton, J.J., Johnston, W.L., and Jiang, B.C. (1988) The role of lifting belts in manual lifting. Int. J.Ind. Ergonomics, 2: 259-266.
McGill, S.M. (1993) Abdominal belts in industry: A position paper on their assets, liabilities and use. Am.Ind.Hyg.Assoc.J., 54 (12): 752-754.
McGill, S.M., and Norman, R.W. (1987) Reassessment of the role of intra-abdominal pressure in spinal compression. Ergonomics, 30 (11): 1565-1588.
McGill, S., Norman, R.W., and Sharratt, M.T. (1990) The effect of an abdominal belt on trunk muscle activity and intra-abdominal pressure during squat lifts. Ergonomics, 33 (2): 147-160.
McGill, S.M., Seguin, J.P., and Bennett, G. (1994) Passive stiffness of the lumbar torso in flexion, extension, lateral bend and axial twist: The effect of belt wearing and breath holding. Spine, 19 (6): 696-704.
McGill, S.M. Invited Paper. (1999) Should industrial workers wear abdominal belts: guidelines based on the recent literature. Int. J. Industrial Ergonomics 23(5-6): 633-636.
McGill, S.M. Medical Management: Back Belts. In: Occupational Ergonomics Handbook (second edition), CRC Press, 2004.
McGill, S.M., Ultimate back fitness and performance, Wabuno Publishers, Waterloo, 2004 (available from www.backfitpro.com).
Mitchell, L.V., Lawler, F.H., Bowen, D., Mote, W., Asundi, P., and Purswell, J. (1994) Effectiveness and cost effectiveness of employer-issued back belts in areas of high risk for back injury. J. Occup. Med., 36 (1): 90-94.
Nachemson, A.L., Andersson, G.B.J., and Schultz, A.B. (1986) Valsalva maneuver biomechanics. Effects on lumbar-trunk loads of elevated intra-abdominal pressures. Spine, 11 (5): 476-479.
National Institute for Occupational Safety and Health (NIOSH) (1994, July) Workplace use of back belts. U.S.Department of Health and Human Services, Centers for Disease Control and Prevention.
Rafacz, W., and McGill, S.M. (1996) Abdominal belts increase diastolic blood pressure. J. Occup. Environ. Med., 38 (9): 925-927.
Reddell, C.R., Congleton, J.J., Huchinson R.D., and Montgomery J.F. (1992) An evaluation of a weightlifting belt and back injury prevention training class for airline baggage handlers. Appl. Ergonomics, 23 (5): 319-329.
Reyna, J.R., Leggett, S.H., Kenney, K., Holmes, B., and Mooney, V. (1995) The effect of lumbar belts on isolated lumbar muscle. Spine, 20 (1): 68-73.
Wassell, J.T., Gardner, L.I., Landsittel, D.P., Johnston, J.J., and Johnston, J.M. (2000) A prospective study of back belts for prevention of back pain and injury. J. Am. Med. Assn., 284 (21): 2727-2734.

This article originally appeared in NSCA's Performance Training Journal, a publication of the National Strength and Conditioning Association. For a free subscription to the journal, browse to www.nsca-lift.org/perform.
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ישן 18-02-07, 23:44   #5
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תודה!

reps for you.
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ישן 18-02-07, 23:45   #6
igorek
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הבאתי את הכתבה כי ראיתי שיותר מדי אנשים פה משתמשים בחגורה אבל אין להם מושג למה הם משתמשים בה והם יכולים לגרום לעצמם נזק בעתיד.
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ישן 18-02-07, 23:47   #7
Antonator1
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יש אנשים בחדרי כושר שבאים לעשות כפיפות מרפקים ופשיטות ברכיים עם חגורה...
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ישן 18-02-07, 23:53   #8
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אגב, בהקשר זה, גם הרבה אנשים חושבים שרצועות לברכיים נועדו למנוע פציעות. ע"פ מה שקראתי (פוסטים של מייק בויל ב- T.nation), הרצועות נועדו רק כדי להתמודד על משקלים כבדים יותר.
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ישן 19-02-07, 00:09   #9
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זה ארוך , יש מילת סיכום בקיצור?
ובקשר לרצועות ברכיים זה ידוע שזה רק למשקלים גבוהים ככה זה מגביל אותך ואין צורך בהם
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ישן 19-02-07, 00:11   #10
igorek
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ציטוט:
פורסם במקור על ידי MosheB
זה ארוך , יש מילת סיכום בקיצור?
ובקשר לרצועות ברכיים זה ידוע שזה רק למשקלים גבוהים ככה זה מגביל אותך ואין צורך בהם
בקיצור, אם אתה בנאדם בריא ולא היו לך בעיות בגב רצוי שתמנע משימוש בחגורה.
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ישן 19-02-07, 00:15   #11
- Idan -
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ציטוט:
פורסם במקור על ידי MosheB
ובקשר לרצועות ברכיים זה ידוע שזה רק למשקלים גבוהים ככה זה מגביל אותך ואין צורך בהם
זה לא ידוע, כי יש פה הרבה אנשים שמשתמשים בזה במטרה למנוע פציעות.
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ישן 19-02-07, 00:17   #12
Antonator1
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לעשות דדליפט עם חגורה זה קצת לא נוח לדעתי.
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ישן 19-02-07, 01:00   #13
Leo
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אני לא ממש אוהב את הדוקטורים האלה שאין להם באמת ניסיון בעסק ,

חגורה באמת חשובה רק לסקווטים ולמיליטרי פרס(אפילו יותר מסקווטים את האמת)
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ישן 19-02-07, 01:17   #14
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אבל מה אם עשית דדליפט והגב עייף ואתה רוצה לעשות תרגיל בעמידה או איזה לחיצת כתפיים?
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ישראלבודי תוספי תזונה לספורטאים במחירים הזולים ביותר בישראל. תוספי תזונה במשלוח מהיר לבית הלקוח
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Bullet מנותק   הגב עם ציטוט
ישן 19-02-07, 08:56   #15
הזברה
IsraelBody VIP - חבר יהלום
 
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ממ, ליאו תלמד לקרוא, המחקרים נעשו על חברה שמתאמנים וגם על אתלטים, זו לא איזה המצאה של איזה דוקטור שלא בדק כלום והוא כתב שם שבממוצע חגורה מעלה את הסיכוי לפציעות וגם שעודף של לחץ תוך בטני פוגע בגב ,בניגוד למה שמלמדים בווינגייט.

אני בעקרון חושב שחגורה זה דבר רע ,עד היום כל פעם שניסיתי אותה היא הפריעה לי לבצע את התרגילים נכון וגם היא מאוד מציקה לי כשהיא לוחצת עליך בזמן התרגיל.
הזברה מנותק   הגב עם ציטוט
ישן 19-02-07, 11:25   #16
ran_z
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גם אני אנטי חגורה ולא משתמש, אני חושב שמלבד נניח בסט אחרון ושהוא יהיה סט די כבד, אפשר ואולי רצוי לשים חגורה, בכל השאר, פשוט מיותר.
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ran_z מנותק   הגב עם ציטוט
ישן 19-02-07, 13:17   #17
toxicity
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ברירת מחדל

http://www.musculardevelopment.com/c.../view/356/129/
הוא משתמש בחגורה לכל תרגיל אתה אומר לי שהוא עושה טעות?
toxicity מנותק   הגב עם ציטוט
ישן 19-02-07, 14:51   #18
הזברה
IsraelBody VIP - חבר יהלום
 
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ברירת מחדל

ציטוט:
פורסם במקור על ידי toxicity
http://www.musculardevelopment.com/c.../view/356/129/
הוא משתמש בחגורה לכל תרגיל אתה אומר לי שהוא עושה טעות?
זה שאדם גדול, לא אומר שמה שהוא עושה נכון. חוץ מזה זה נושא מאוד לא מפורסם ,יכול להיות שהבנאדם שהבאת פשוט לא מודע לזה.
לדעתי ,הרבה יותר הגיוני לגבש דעה לפי מאמר של מומחה עולמי בעל שם שמתייחס למחקרים שנעשו על הרבה אנשים כמוך וכמוני ,מאשר לפי בודיבילדר גדול שאין שום סיבה שמה שהוא עושה טוב לעמוד השדרה ולבריאות שלו.
הזברה מנותק   הגב עם ציטוט
ישן 19-02-07, 16:17   #19
Nimrod
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במסור זה די הכרחי :x, יעני בלי חגורה הגב עקום.
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המסה שלך זה 80% אימונים
החיטוב והמסה שלך זה 100% סטרואידים"

ג'אי קטלר במסה (תמונה חדשה) :
http://img19.imageshack.us/img19/9108/66454295sl1.jpg

"סמים הם סטרואידים לנשמה"

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מני = מלך ישראל! (חי חי וקיים)
Nimrod מנותק   הגב עם ציטוט
ישן 19-02-07, 16:34   #20
Nadav19
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תאריך הצטרפות: Jul 2006
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עוסק ב:: גויאבות, מישמיש... ירקות, פירות.
ברירת מחדל

אני שם חגורה בכל תרגיל בעמידה..

אם זה סיבובי ידיים, או הנפת ידיים לצצדים או הרמת מוט W בעמידה.
יותר נוח לי, עזבו את הקטע של הבריאות.

חוצמיזה שזה לא מפריע ורק עוזר.
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Nadav19 מנותק   הגב עם ציטוט
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