Wave SummationThe degree to which a muscle contracts is dependent upon several f

Wave SummationThe degree to which a muscle contracts is dependent upon several f www.phwiki.com

Wave SummationThe degree to which a muscle contracts is dependent upon several f

Pollock, Kent, Faculty Advisor has reference to this Academic Journal, PHwiki organized this Journal Wave SummationThe degree to which a muscle contracts is dependent upon several factor – including the number of motor units recruited by the brainThe number recruited, will determine the FORCE that can be generated within the muscle.The greater the strength required – the greater the number of motor units ( in addition to there as long as e muscle fibres) that contract.The frequency with which impulses arrive at the muscle fibresThe motor unit will respond to a stimulus (impulse) by giving a ‘twitch’ – a brief period of contraction followed by relaxationWhen a second impulse is applied to the Motor Unit be as long as e it completely relaxes from the previous stimuli, the sum of both stimuli occurs – increasing the total contractionTHIS IS MULTIPLE WAVE SUMMATIONWave SummationWhen rapid firing of stimuli occurs, giving muscles little or no time as long as relaxation – Tetanus/tetanic contractions take placeAn increase in total contraction can be explained by the release of calcium ions which causes greater cross bridge attachment of myosin onto actin.Prac:High degree of as long as ce to be generated over a relatively short period of time – such as a shot putter. Multiple Wave summation – muscle fatigue will soon kick in.Spatial SummationAthletes requiring muscular as long as ces over an extended period of time, will recruit motor units slightly out of synchronisation.There as long as e they will not all contract at the same time.Whole muscle shares the workload – so when some motor units contract, others will be recovering.This spreads fatigue throughout the muscle, there as long as e delaying the ‘fatiguing effects’ throughout the muscle.M.U 1+3 contracting simultaneously, while MU 2+4 are recovering (see diagram) `

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Pollock, Kent Sierra Independent Press Faculty Advisor www.phwiki.com

Pollock, Kent Faculty Advisor

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