Is There Power Involved in Holding a Weight at Rest?

[matttan]

For example,
if you are going to the gym and lift a 5kg weight and you lift it till you wrist level and stop moving. Does your body lose/exerts energy during the interval when you are not moving?
And is there are power involved?

 

[stewartcs]

For example,
if you are going to the gym and lift a 5kg weight and you lift it till you wrist level and stop moving. Does your body lose/exerts energy during the interval when you are not moving?

Yes, one "uses" energy to hold the weight.

And is there are power involved?

No, since there is no displacement, no work is done. Note that "effort" and "work" are not the same thing.

CS