PRo Lesson A02 ems, Inc. BIOPAC Systems, Inc. Figure 23 be duration of the relax
ID: 3478770 • Letter: P
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PRo Lesson A02 ems, Inc. BIOPAC Systems, Inc. Figure 23 be duration of the relaxation phase, zoom in and select an area from the peak of on to the end of the contraction. The "SC oontraction measurement will display the duration i o the The relaxation phase returns to baseline more slowly than the contraction phase. If it is difficult to see the point where the signa returns to baseline, zoom out more (compress the data) then re-select the area Note: phase. Figure 24 stimulate the sciatic nerve or directly stimulate the muscle? od you Threshold Condition Stimulus Level Amplitude of Latent Period Duration of Duration of Volts)Contacion(msecContracionPhase Relasamions Phase Contraction PhaseRelaxation Phase (msec)(msec) (grams) Delta T Doita T Threshold Maximal Response Table 1 Volts Calculate the Stimulus level between Threshold and Maximal (used for Summation) 1.96 aculate the twitch duration for the Threshold response: 20msec .22 Caciate the twitch duration for the maximal response, msec .28 sec Questions: 1 When stimulating the sciatic nerve, what happens to the number of fibers producing action'potentials as you increased the voltage? When you directly stimulate the muscle: a. Why does the force increase as the voltage is increased? b Would this be considered motor unit recruitment? 23 Page 17 of :a © BIOPAC Systems, IncExplanation / Answer
1.
The number of fibres increases with increasing voltage until each nerve fibre got stimulation. This increases intensity of signals.
2a. Voltage increase perform more muscle fibres to stimulate, this causes more muscle fibres to get in contraction phase. That increases the force value from all activated muscle fibres. Force of muscle produces from contraction of sarcomere.
2b. Yes, this can consider as motor unit recruitment because more motor units will activate by increasing voltage but up to limit of all muscle fibres activation. Motor unit form by connection between a motor neuron and a muscle fibre.
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