לא רק שזה פוגע, זה מנמיך.
הנה מעיין קובץ שהכנתי להורים של חלק מהמתאמנים שלי (אני מאמן אישי גם של הרמת משקולות
בינתיים יש ילד בן 14 מתאמן אצלי שנה כבר, בוא נגיד שהוא גבה 10-15 ס"מ +/- משהתחיל,
מקום ראשון בכל התחרויות בשיעורי ספורט בבצפר ומרים משקלים יותר מחלק מבני ה20 במכון)
מאמרים בנוגע לצפיפות עצם והקשר בינה לבין הרמת משקולות בקרב נערים וילדים:
1. המאמר המלא:
http://www.yalemedicalgroup.org/stw/...geid=stw000836
weight training for teens
although children can begin weight training earlier, they don't usually build muscle until they hit puberty and hormones make it possible to increase muscle mass.
"research suggests strength training has a lot to offer some teenagers in terms of health, fitness and fun," says barbara brehm-curtis, ed.d., a professor of exercise and sport studies at smith college in northampton, mass.
Teens who work out with weights, as well as exercise aerobically, reduce by half their risk for sports injuries. Weight training also helps improve sports performance. It boosts bone density and strengthens tendons, dr. Brehm-curtis says.
If your teen is interested in a weight-training program, keep the following guidelines in mind.
2. במקרה רשום מאמר בדיוק על הגיל המדובר, המאמר המלא:
http://www.livestrong.com/article/47...year-old-boys/
effects
teenagers who participate in weight training will see an improvement in muscular strength, muscular endurance, coordination, sports performance, bone strength, bone density and self-confidence, says the national strength and conditioning association. Most of these improvements are based on the neuromuscular system becoming more efficient. Teenage boys will likely not see significant gains in muscle size until they reach puberty, which is marked by an increase in the muscle-building hormone testosterone.
3. קישור למאמר המלא :
http://www.buzzle.com/articles/weigh...-for-kids.html
why weightlifting for kids?
Everyone knows that kids don't have any need for bodybuilding. Then why should they perform weight training exercises? The answer lies in the fact that when muscle exerts pressure, the tissues involved, tear. The body's repair mechanism tries to recover the loss and builds more muscle tissue in that area than was present earlier. In this way, weightlifting exercises can increase muscle density and bone strength and also keep the repair mechanism of the body in function. But these results will only be visible when these exercises are done in a right manner by following an appropriate regimen. So the aim of weightlifting exercises for children is never to build their body like weightlifters, but to develop strength and steer them toward a healthy lifestyle.
When should a kid start?
The appropriate age is 9. The safest age to start is between 10-12 years. However, kids as young as 8 are also known for adapting well.
What are the benefits?
Weightlifting exercises are beneficial for the kid's health in many ways.
• helps in muscle building. It also increases muscle strength and endurance and prevents injury in the joints.
• improves performance in any sport, dance, and other physical activities.
• strengthens the bones. Maintains a healthy cholesterol level and blood pressure.
• maintains body weight.
• boosts rate of metabolism.
A healthy body makes a kid look good. This boosts his self-confidence. Weightlifting exercises are interesting to perform and, in most cases, kids develop their own weekly routine for sticking to it. This inculcates in them a positive attitude toward good health. They learn to love and respect their bodies, and this outlook gives them a higher chance of staying healthy in the long run. Therefore, pediatricians and expert trainers recommend weightlifting exercises for children.
מאמרים כלליים וחלקים מהם :
1. קישור למאמר המלא :
http://www.ehow.com/how-does_4744368...e-density.html
bone density
• lifting weights is important to increase bone density in all people. It is especially vital for women since they lose more bone density than men after menopause because of a decrease in estrogen. Lifting weights throughout your life will make your bones stronger in old age. Broken bones are the leading reason elderly people end up in nursing homes. Strong bones enable you to have an active and healthy lifestyle that leads to a longer life. Weak bones will shorten your life expectancy.
Secondary bone benefits
• lifting weights also protects your bones in unexpected ways. Weight resistance exercises make muscles stronger and improves balance. That makes it less likely that you will break a bone if you happen to fall down. Strong muscles protect the bones from damage in an impact. Improved balance also makes it less likely that you will fall down in the first place.
2. קישור למאמר המלא :
http://sportsmedicine.about.com/od/t...seandbones.htm
exercise and bone density
in 2009, researchers from the bone & joint injury prevention & rehabilitation center at the university of michigan reviewed research as far back as 1961 to determine the impact exercise has on bone density and bone health.
They found three characteristics of exercise have the largest impact on increased bone density. They are:
• strain magnitude of the exercise (this is higher in exercise such as gymnastics and weightlifting where the force or impact of the exercise is greatest).
• strain rate of the exercise (this is higher in exercise such as jumping or plyometrics where the rate at which the impact is felt is high).
מאותו המאמר :
The best exercises for increasing bone density
experts recommend the following forms of exercise for all athletes in order to increase bone density and prevent bone loss:
• weight training, especially the squat exercise
• plyometrics
• jump training
• stair running
• body weight exercises
• jump roping
nutrition and exercise best for building strong bones
building and maintaining bone mass requires more than weight-bearing exercise alone. A combination of good nutrition and weight-bearing exercise is the ideal way to build bone mass. Once we reach about age 30, we don't build bone as readily so building adequate bone density early in life is the best way to prevent osteoporosis later. As an adult, the best way to maintain the bone mass is the same way you build it -- getting adequate calcium in your diet and doing weight-bearing exercise.
מאמרים נוספים:
http://www.niams.nih.gov/health_info...le/default.asp
http://www.naturalnews.com/010528.html