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09>å($j;PSqlRQYե+3*\xW+in;dB s t s e t . T h a t b o d y w e i g h t i s d i v i d e d b e t w e e n t h e t w o l e g s , s o t h a t , e v e n t a k i n g a c c e l e r a t i o n i n t o a c c o u n t , t h e l o a d i n g p e r l e g i s b o d y w e i g h t o r a l i t t l e m o r e , w h i l e t h e s p i n e i s s u b j e c t e d t o t h e f u l l l o a d o n t h e b a r . I n o t h e r w o r d s , t h e l e g s a n d s p i n e i n c o n t r o l l e d s q u a t t i n g a r e e x p o s e d t o s i g n i f i c a n t l y l e s s f o r c e t h a n i n r u n n i n g a n d j u m p i n g . N o r m a l l y , e x e r c i s e s s u c h a s s q u a t t i n g w i l l b e d o n e n o m o r e t h a n t w i c e a w e e k f o r a t o t a l o f a b o u t 6 0 r e p e t i t i o n s , w h i l e t h e r u n n i n g c h i l d w i l l r u n e v e r y d a y a n d s u b j e c t t h e b o d y t o t h o s e m a n y t h o u s a n d s o f i m p u l s i v e f o o t s t r i k e s . < b r > I t d o e s n o t r e q u i r e m u c h s c i e n t i f i c k n o w l e d g e o r c o m p u t a t i o n a l g e n i u s t o s e e t h a t t h e c u m u l a t i v l o a d i n g i m p o s e d b y s i m p l e r u n n i n g a c t i v i t i e s o n t h e l o w e r e x t r e m i t i e s a n d t h e s p i n e i s f a r g r e a t e r t h a n t h e c u m u l a t i v e l o a d o f t w o o r t h r e e t i m e s a w e e k o f w e i g h t t r a i n i n g . D o e s t h i s n o w m e a n t h a t w e a r e j u s t i f i e d i n r e c o m m e n d i n g t h a t c h i l d r e n n o t b e a l l o w e d t o r u n , j u m p , t h r o w o r c a t c h b e c a u s e b i o m e c h a n i c a l r e s e a r c h d e f i n i t e l y s h o w s t h a t s u c h a c t i v i t i e s c a n p r o d u c e v e r y l a r g e f o r c e s o n m a n y p a r t s o f t h e g r o w i n g b o d y ? < b r > I t s h o u l d b e o b v i o u s t h e n t h a t t h e r e i s n o t h i n g w r o n g w i t h r u n n i n g a n d o t h e r n o r m a l a c t i v i t i e s o f c h i l d h o o d , a n d t h e r e f o r e n o r e a s o n t o d i s a l l o w a c t i v i t i e s o f l e s s e r i m p a c t , s u c h a s c a r e f u l l y s t r u c t u r e d p r o g r a m s o f w e i g h t t r a i n i n g . < b r > S i f f a l s o n o t e s t h a t b o n e d e n s i t y s c a n s h a v e p r o v e n t h a t y o u n g s t e r s w h o d o c o m p e t i t i v e w e i g h t l i f t i n g ( i . e . , t h e s n a t c h a n d t h e c l e a n a n d j e r k ) h a v e h i g h e r b o n e d e n s i t i e s t h a n c h i l d r e n w h o d o n o t u s e w e i g h t s , a n d t h a t c l i n i c a l r e s e a r c h h a s n o t s h o w n a n y c o r r e l a t i o n b e t w e e n w e i g h t t r a i n i n g a n d e p i p h y s i a l d a m a g e . F u r t h e r , a n e x t e n s i v e R u s s i a n s t u d y o n y o u n g a t h l e t e s , p u b l i s h e d i n a b o o k e n t i t l e d S c h o o l o f H e i g h t , c o n c l u d e d t h a t h e a v y l i f t i n g t e n d s t o s t i m u l a t e b o n e g r o w t h i n y o u n g a t h l e t e s r a t h e r t h a n i n h i b i t i t . < b r > T w o p o s s i b l e r e a s o n s f o r t h e f e a r t h a t w e i g h t t r a i n i n g c o u l d s t u n t g r o w t h a r e t h a t w e i g h t l i f t e r s t e n d t o p o s s e s s m o r e m u s c l e m a s s t h a n o t h e r a t h l e t e s a n d t h a t s m a l l e r a t h l e t e s a r e a t t r a c t e d t o t h e s p o r t . I n g y m n a s t i c s , t h e a v e r a g e h e i g h t o f e l i t e a t h l e t e s h a s s t e a d i l y d e c l i n e d i n t h e p a s t s e v e r a l O l y m p i c s b e c a u s e s h o r t e r a t h l e t e s t e n d t o b e m o r e s u c c e s s f u l i n t h i s s p o r t . B u t s a y i n g t h a t w e i g h t l i f t i n g m a k e s y o u s h o r t e r b e c a u s e m a n y e l i t e w e i g h t l i f t e r s a r e s h o r t w o u l d b e l i k e s a y i n g t h a t b a s k e t b a l l m a k e s y o u t a l l e r b e c a u s e m o s t p r o f e s s i o n a l b a s k e t b a l l p l a y e r s a r e t a l l ! < b r > < b r > T h e N u m b e r s G a m e < b r > < b r > R i s k o f i n j u r y i s a n o t h e r a r e a o f c o n c e r n f o r s o m e c o a c h e s a n d p a r e n t s . I n t h i s r e g a r d , i t s i n s t r u c t i v e t o l o o k a t t h e m a n y s t u d i e s t h a t h a v e m e a s u r e d t h e r a t e o f i n j u r i e s a s s o c i a t e d w i t h w e i g h t t r a i n i n g c o m p a r e d t o o t h e r s p o r t s . F o r e x a m p l e , a s t u d y p u b l i s h e d i n t h e N o v e m b e r / D e c e m b e r 2 0 0 1 i s s u e o f t h e J o u r n a l o f A m e r i c a n A c a d e m y o f O r t h o p a e d i c S u r g e o n s c i t e d r e s e a r c h s h o w i n g t h a t i n c h i l d r e n a g e d 5 t o 1 4 y e a r s , t h e n u m b e r o f i n j u r i e s f r o m b i c y c l i n g w a s a l m o s t 4 0 0 p e r c e n t g r e a t e r t h a n f r o m w e i g h t l i f t i n g ! 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