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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 aHead Start on the Competition<br><br>First, it s time for some mre 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 uscular 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 been allowed in competition to have spotters place the barbell on the chest to begin the lift, it is a technique seldom used because there is virtually no plyometric effect with this technique (besides the fact that you have to have well-trained spotters to properly place the weight on the chest).<br>In certain sporting movements, an isometric contraction in the set position precedes a concentric contraction, but tZ]YN'UH l/#=:jIMY@7OJڜɓ[#/: +ImW0}k)Gs$ZGo2BHW=J(50h~;֛հTG3y9z .1SgtMf-+я9)ٽkۙ`eTبIQMJIBIMF$T}0C$y$I=ZPaX\6Wm]M'l>If +?NҶ6 ܰkAt{/X`JNcJiVj;=*kȜ1b8Dz $oIҴ` ӰacFl}qR U& (Z3,О?*(Xcd헆0,"S^ei}ȌQ]$cq>jRӲml1Gnz['ut2?9w>&, E i hY*s xXUaG 5q}%ˆlTbLhso`EZ9$ 3>?^Hp#wۿQ*R{l/@0Zr .s;431SI֘Xn@=y Mb14SN3SGvƌ=fNpʱ'Զ̂=+<6PnS5N)]ǡ;GzrGr VU 鞵枈i4Ehr&Gosog('Z%grTKieA jdNH,zjF8L3G HFOwQs˪D\2Apd#6iָN>3EN(Œnʿa @k: iS}@qM42A Joi^l'xZ-5l&of]361QN@%Q-޽