Muscle Fatigue and Crossbridge Function Quiz

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What are the possible sites of peripheral fatigue?

Motoneurons, brain, sarcoplasmic reticulum

Brain, spinal cord, neuromuscular junction

Central fatigue, spinal cord, muscle fiber

Motoneurons, neuromuscular junction, muscle fiber (correct)

What does fatigue lead to in terms of crossbridge function?

Reduction in the number of crossbridges only

Increase in the number of crossbridges, force per crossbridge, and/or the rate of crossbridge activation and deactivation

Reduction in the number of crossbridges, force per crossbridge, and/or the rate of crossbridge activation and deactivation (correct)

No effect on the number of crossbridges, force per crossbridge, and/or the rate of crossbridge activation and deactivation

Which side of the force-velocity and power-velocity relationships is more affected by fatigue?

None of the sides are affected by fatigue

Eccentric side

Concentric side (correct)

Isometric side

What is the effect of fatigue on ISOmax and Vmax?

Reduced ISOmax and reduced Vmax Signup and view all the answers

What is a possible cause of central fatigue during a 400 m race?

Decrease in neurotransmitters Signup and view all the answers

What contributes to motor unit 'drop-off' during fatigue at MVC?

Reduction in active muscle fibers Signup and view all the answers

What is the role of pain/discomfort in motor unit activation?

Lead to a decrease in motor unit activation Signup and view all the answers

What is a possible cause of decreased membrane excitability at the motoneuron level?

Reflex inhibition Signup and view all the answers

What is a possible cause of peripheral fatigue during a 42 km race?

Increase in metabolites (ex. H+) Signup and view all the answers

What does the Interpolated Twitch Technique demonstrate?

Decrease in motor unit activation (i.e. central fatigue) Signup and view all the answers

What can overcome some central fatigue?

Arousal (ex. gunshot, shouting, crowd motivation, etc.) Signup and view all the answers

What is the effect of pain/discomfort on motor unit activation?

Lead to a decrease in motor unit activation Signup and view all the answers

What is the effect of hypoglycemia on cognitive ability?

Negatively impact cognitive ability Signup and view all the answers

What is a possible cause of peripheral fatigue during a 400 m race?

Increase in metabolites (ex. H+) Signup and view all the answers

What is the effect of pain/discomfort on motor unit firing rates?

Lead to a decrease in motor unit firing rates Signup and view all the answers

Muscle Fatigue and Crossbridge Function Quiz

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