17. Muscle Twitch & Wave Summation

What instrument measures muscle tension?

Myogram

What is a muscle twitch?

Single, brief contraction

What stimulus triggers a muscle twitch?

Single stimulus

What are the three periods of a muscle twitch?

1. Latent, 2. Contraction, 3. Relaxation

What is the latent period?

Brief delay before contraction

What occurs during the contraction period?

Active contraction

What occurs during the relaxation period?

Passive return to resting

What timing produces wave summation?

Stimulus before muscle relaxes

What occurs during wave summation?

Waves of contraction add

What physiological result is caused by wave summation?

Increase tension

What stimulation frequency defines incomplete tetanus?

50 times per second

What relaxation state occurs during incomplete tetanus?

Partial relaxation

What stimulation frequency defines complete tetanus?

80-100 times per second

What relaxation state occurs during complete tetanus?

No relaxation

What contraction state is produced by complete tetanus?

Sustained contraction