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OzuܱQ B@9LTݬ- z,Q* )PW5ԌMʃsڕ8Y$AV US!9Os֫Lk#CP#LZ,+#PF\o,5 &7BN*2,PC.?OSbzFyXpw'_JLVI&9OG JM+ޞܢLčxYnbe vҖ/"9a@ӏ4 e  zՠ\mV'{HqWz.i&&QZ!f;P1BWHS %bĬ >lԶ5%Fv*F;TwıO Ooo8 3P4k1Y-*>G\>V221hbئM0H_\ҏq#Eq"ckt+)ݷ bOy.M(1) 7}OK HK9[[̞-ݒ:Gb%!b 2NT?J+JY4*x`?Ҋwg=broj|GJ(ƾ!.@3cgZO S[#N۟U⨷ jG}a!rÓKn8'{EIkq&;?!6#%gJ(?R6ɍN !#k?2EPx>LE'I enOP8t9\ԋlrv5\.jX $jJp;L2tm=+E3N*eSBfD<$4ˌeEzU'9o1ĉ* Eubescent baseball players. Journal of Strength and Conditioning Research, 10: 8-14.<br><br>Dietz, W. (1990). Children and television. In Green, M. & Hagerty, R. (eds). Ambulatory Pediatrics IV. Philadelphia: WB Saunders, 39-41.<br><br>Docherty, D., Wenger, H., Collis, M., et al. (1987). The effects of variable speed resistance training on strength development in prepubertal boys. Journal of Human Movement Studies, 13: 377-382.<br><br>Dominguez, R. (1978). Shoulderce the additional bodyweight developed from full squats could add extra muscle mass that would decrease jumping height (and, for some athletes, adversely affect the aesthetics of the performance, which greatly influence the athletes placement). Other athletes who may not want to develop additional muscle mass from emphasizing full squats are gymnasts, divers, high jumpers and even swimmers. <br>Let s examine the box squat in more detail by looking at the concept of starting strength.<br><br>Getting a Head Start on the Competition<br><br>First, it s time for some more definitions. During a concentric contraction a muscle develops tension and shortens, causing movement to occur. During an isometric contraction a muscle develops tension without a change in joint angle; thus no external movement occurs. And during an eccentric contraction, a muscle develops tension and lengthens, also causing movement to occur.<br>One factor that makes the box squat especially effective for sport-specific training is that the exercise requires the athlete to perform a concentric muscular contraction after a prolonged isometric muscular contraction. The effect of this on performance is that the pause (isometric) phase dissipates the stored energy (part of the plyometric effect) that develops during the lowering (eccentric) phase of the lift, energy that would otherwise be used to help during the lifting phase. <br>In powerlifting competition, research has shown that an extra second delay waiting for the judge s signal to press the weight off the chest in the bench press could result in a five-percent difference in the amount of weight lifted. This is one reason that although it has