LAB 6

What happens to EMG activity with stronger contractions?

More motor units are recruited, and firing frequency increases.

What characterizes Slow-twitch (Type I) muscle fibers?

They're fatigue-resistant and rely on oxidative metabolism.

What characterizes Fast-twitch (Type II) muscle fibers?

They fatigue quickly and rely on anaerobic metabolism.

What occurs if reciprocal inhibition is impaired?

Antagonist muscles don't relax, leading to stiffness and movement issues.

What happens to EMG activity during the contraction of the opposing muscle?

Agonist EMG increases, while antagonist EMG decreases due to reciprocal inhibition.

How does muscle length affect force production?

Maximum force is produced at mid-range length; being too short or too long reduces force.

Which type of contraction produces the most force?

Eccentric contractions generate the most force.

What factors influence force production in eccentric contractions?

Passive elastic elements (titin), greater actin-myosin engagement, and slower cross-bridge detachment.

How can trainers use force-velocity knowledge for hamstring recovery?

Begin with slow eccentric training and then progress to faster movements.