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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