Bone Growth and Youth Development

12-2-16

Adam Boily MS, MATJS, USAW

Here might be the most commonly asked question a strength & conditioning professional must answer to youth athlete parents.

Question:

“Will my 13 year old child (or younger or teenager) have a stunted growth from lifting weights?”

Answer:

It depends. It depends if the athlete is exercising biomechanically correct or not. Stunted bone growth may occur when the open growth plates located at the ends of bones become damaged. Damaged open growth plates can happen for various reasons, which include an injury from sport or poor exercising technique. For example, if a 12 yo athlete playing soccer sustains a trauma to the knee in a soccer game, he/she could incur growth plate damage around the knee. Another way an athlete can sustain growth plate damage in the knee would be biomechanically incorrect weight-bearing exercises. Say a 10 yo athlete is front squatting and during every repetition their right knee caves in with a valgus moment. If an expert S&C coach is not there coaching the athlete out of these poor mechanics, overtime knee growth plate damage might occur before the plate close. However, most youth athletes will not experience growth plate damage from training or in sport as long as qualified professionals are monitoring exercises.

It’s important to develop youth athletes through sport and training participation because their young bodies and minds are like sponges and we want them to learn exercise technique and proper nutrition before they may learn bad habits. To avoid growth plate damage in young athletes, their training should be focused on light loads (body weight or light weights) so they can learn the intention of each exercise. When an athlete is below the age of 13 yo, they benefit tremendously from learning proper biomechanically correct exercise techniques and become strong through a long amount of isometric exercises. Before weight is increased for the youth athletes, volume and isometric times should be increased substantially so proper technique is reinforced and the athlete naturally performs exercises biomechanically correct. These exercises may include squatting, pressing, pulling, running, and jumping. Typically we find that athletes starting to exercise around 5-8 yo will become strong enough and biomechanically adequate for progressive resistance training when they reach 14 yo. Also, at this point, the growth plates are still open/undamaged and these athletes will start peak height velocity (puberty).

Surges of hormones, including testosterone, are beginning to flow through the athlete naturally. This is the ideal time for athletes to exercise with heavier resistance and advanced plyometrics. With the surge in hormones and advanced strength and conditioning volume combined, the athlete will experience hypertrophy of lean muscles, increased bone density, length, and girth as well as other bodily tissue growing. Sometimes, an athlete will grow rapidly and the muscles become stretch so fast that the brain has a hard time communicating to or controlling the muscles during this growth. In this case the athlete will become clumsy or uncoordinated (you may have this seen this with young basketball players). However, if during this time that same athlete were in a proper training program, especially involving isometric exercises (pillars or infant squats), their muscles would remain strong and would not become as clumsy. During this time of puberty, the athletes’ recovery time will be much more rapid allowing them to endure progressive amounts of volume from day to day and week to week.

To some it all up, participating in unsupervised training or with unqualified coaches could potentially put youth athletes in scenarios that could damage growth plates. Again, few youth athletes experience stunted growth and damaged growth plates and these rare occurrences from improper movements should not detour youth athletes from exercising young. The benefits a youth athlete receives from intelligent training and sport play are far too valuable to be passed up. There are many brilliant minds and a plethora of scientific research that shows bone growth will be improved (sometimes more than genetics had planned) rather than stunted through biomechanically sound youth training. Depriving a youth athlete from proper training before, during and after their peak height velocity is doing that athlete a major disservice and could potentially cause that athlete to never reach their full genetic potential.

 

*For more information join our BPSU and go research and study the work of Istvan Balyi (an expert in long term athlete development).