Movement Lab
This is an attempt to explain how temperature and fatigue affects the function of muscle. This is important so we know what is needed to optimize our performance.
1. What are the three changes you observed in a muscle while it is working (contracted)?
The muscle shortened.
The muscle diameter enlarged.
The muscle became hard.
2. What effect did the cold temperature have on the action of your hand muscles? Explain.
I imagine that most people had a greater difference. My hands are always cold (Raynauld's Phenomenon). The cold water caused the muscles to ache and respond slowly.
3. In Figure 3, make a line graph of your results of the fatigue experiment. Be sure to fill in the values on the vertical axis.
Number of trials indicated above
Maybe the reps leveled off because my hand was warming up from exercising.
Maybe the reps leveled off because my hand was warming up from exercising.
4. What effect did fatigue have on the action of your hand muscles? Explain.
I quickly felt the aching and slowing of response to continous squeezing. Initially the Creatine Phosphate pathway was utilized by the muscles, but this is good for only 5 seconds. Next, the muscles obtain ATP by fermentation, which produces a build-up of lactate. This is felt as aching in your muscles and is an anaerobic metabolism. I believe that the process was not able to keep up with the demand and that is why I could not maintain faster repetitions.
Below is an interesting chart showing how our muscles use the energy stores and methods.
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