Power training, involving the development of speed and strength in combination, usually consists of lighter weights with increased reps.

Strength training, usually consists of lower reps with heavier weights.

To begin with I am aware of actin-myosin interactions.

What is the difference between actin-myosin connections in a muscle that is trained for power compared to that of strength that gives the muslce increased speed and a more defined look? Is the muscles density increased through constant connection of actin-myosin filaments during power training that allows a muscle to have comparable strength to one twice its size?

Stength training often elicits a greater degree of hypertrophy than power. Is there any difference in the 'muscle efficiency', per cubic inch of muscle, in a muscle trained primarily for power than that in strength?

I'm looking for answers based a physiological perspective.

-GJ