This data supports the idea that positive reinforcement helps to increase the number of activated muscle fibers and causes the individual to exert more force. Based on the data provided in table 6 and the 3 graphs, neuromuscular systems try to overcome fatigue by increasing the amount of activated muscle fibers. This can cause injury because the increase in lactic acid inhibits contraction, meaning tough physical activity can put too much pressure of the muscle. The last 20 seconds in table 7’s mean grip strength were slightly higher than table 6. This provides evidence that visual stimulation may provide the brain with more fuel than positive feedback from peers. In table 8, the mean grip strength from the first 20 seconds, were greater than the last 20 seconds, and the opposite is true for table 6. This shows that for the individual positive reinforcement didn’t increase the grip strength as much and in the constant gripping. The percent change between 0-20 seconds and 80-100 seconds for tables 6 is 43.04% and for table 8 is 36%. This information does not support the idea that brief relaxation delays muscle fatigue. In general, many of the ideas presented were supported by the experiments conducted in this lab. However, because the information was only acquired from one class of biology students, and only one trial of each experiment was completed, the data does not present strong statistical evidence for the presented hypotheses. In this lab a greater understanding of muscle units and their functions in action was acquired. When being physically active more fibers are activated. Having a greater understanding of grip strength and pinch strength provides a larger understanding of daily activity, and neuromuscular illness.
References: 1. Lab Activity Reference: Hebel, Angela “Analysis of working muscle” 2. Internet Source Reference: Biophysical Journal “A dynamic model of muscle activation, fatigue, and recovery” 3. Internet Source Reference: EMM “Muscle fatigue: general understanding and treatment” 4. Internet Source Reference: PMC “Muscle fatigue: what, why and how it influences muscle function”
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