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Power in mechanical systems is the combination of forces and movement. In particular, power is the product of a force on an object and the object's velocity, or the product of a torque on a shaft and the shaft's angular velocity. Mechanical power is also described as the time derivative of work.
Human power is the rate of work or energy that is produced from the human body. It can also refer to the power (rate of work per time) of a human. Power comes primarily from muscles, but body heat is also used to do work like warming shelters, food, or other humans.
Muscle force: 1.7: Static contractions ... Stevens' power law is an empirical relationship in psychophysics between an increased intensity or strength in a ...
Higher power output is produced because the energy is released in a much shorter amount of time than it is stored. In this sense the power of the muscles is actually amplified. When energy is produced by muscle contraction, stored in a tendon, then released to increase mechanical energy of the body (or body segment), muscle power is amplified.
[11] [12]: 150 The physics concept of force makes quantitative the everyday idea of a push or a pull. Forces in Newtonian mechanics are often due to strings and ropes, friction, muscle effort, gravity, and so forth. Like displacement, velocity, and acceleration, force is a vector quantity.
The three-element Hill muscle model is a representation of the muscle mechanical response. The model is constituted by a contractile element ( CE ) and two non-linear spring elements , one in series ( SE ) and another in parallel ( PE ).
This rate exceeds the muscle's maximum capacity for energy. In comparison, power amplification of tendons allow for greater output of power that can exceed the capacity of their respective muscle. This elastic mechanism can lead to the following reductions by lengthening muscles: peak power input, lengthening velocity, and force. Muscle damage ...
Although power output is a principal determinant of jump distance (as noted above), physiological constraints limit muscle power to approximately 375 Watts per kilogram of muscle. [2] To overcome this limitation, grasshoppers anchor their legs via an internal "catch mechanism" while their muscles stretch an elastic apodeme (similar to a ...