BPK Lab#5

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Mechanical Engineering

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Apr 3, 2024

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BPK 142 Lab #5 Muscular Strength, Power, Endurance 1. Compare your velocity versus force graph, and your power versus velocity graph to the graphs shown in Unit 11 on page 11-7 and 11-8 in the BPK 142 Laboratory Manual (3 marks) The velocity versus force graph on page 11-7 and my own have similar downward shaped curves, as they follow the trend that as force increases velocity decrease (or as velocity increases the amount of force produced decreases). For example, a weight force of 63.8N (80% of 1RM) produced a velocity of 0.33m/s, and a weight force of 15.7N (20% of 1RM) produced a velocity of 0.52m/s. As the speed of the movement increases, the force output of a muscle decreases considerably and vice versa. The power versus velocity graph on page 11-8 and my own have a similar upside down ‘U’ shaped curve, as they follow the trend that power increases as velocity increases, until a certain point (~80% of 1RM), then power decreases as velocity increases. For example, when using 60% of 1RM as power of 12.5 watts and velocity of 0.26m/s was achieved, when using 80% of 1RM a power of 21.1 watts and velocity of 0.33m/s was achieved, and when using 40% of 1RM a power of 12.6 watts and velocity of 0.39m/s was achieved. 2. With reference to your velocity versus force graph, power versus velocity graph, and power versus force graph, what general information is given by these graphs regarding the optimal combinations of force and velocity needed to obtain maximal power output for any task (2 marks) Based on the graphs the maximal power output is seen with 80% of 1RM when the combinations of force and velocity are both relatively even. For example, from the
velocity versus force graph showed us that force decrease as velocity increases, from the power versus velocity graph we notice that the median velocity (0.33m/s) produced the highest power and from the power versus force graphs we notice the force (63.8N) associated with the median velocity produced the highest power. From these graph you can conclude that a medium velocity will be associated with a relatively similar force (medium), which will be the optimal combinations of force and velocity to obtain maximal power output.
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