# How to measure muscle strain

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I am trying to figure out if there is a way to measure muscle strain.

If I apply a force F to compress a hand grip to the maximum distance x

The work done to compress the hand grip is F*x

Work done = Fx

Since work done = energy used, I can change the equation to:

Energy used = Fx

When our muscles use energy to perform work, we get muscle strain. I can change the wording to:

Muscle strain = Fx

If I continue to hold on to the hand grip so that it would not spring back, I need to maintain the energy used. As time passes, more energy is used (no work is done) because I can feel that the muscle strain becomes muscle pain.

If I hold on to the hand grip for 10 s. Can I define the muscle strain to be:

Muscle strain = Fx * 10s (and the scientific unit is Nms)

I don't have to go into the cellular level to explain the various chemical reactions that take place to maintain the hand grip in compressed position. I just have to know the external force acting on my hand muscles.

I can't find any literature to scientifically measure muscle strain. Can I define muscle strain as such since no one has done it?

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