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Questions and Answers
What is the main reason why the same input to a muscle (twitch) results in significantly more force output in the potentiated state?
What is the main reason why the same input to a muscle (twitch) results in significantly more force output in the potentiated state?
- Decreased twitch potentiation
- Changes in Ca2+ kinetics at the sarcoplasmic reticulum level (correct)
- Myosin light-chain dephosphorylation during actin/myosin interaction
- Reduction in motor unit firing rates
How are motor unit firing rates affected by potentiation?
How are motor unit firing rates affected by potentiation?
- Motor unit firing rates decrease significantly
- Motor unit firing rates increase significantly (correct)
- Motor unit firing rates become irregular
- Motor unit firing rates remain unchanged
What is the main factor that enhances the active state during a brief high-intensity tetanus or voluntary contractions?
What is the main factor that enhances the active state during a brief high-intensity tetanus or voluntary contractions?
- Enhanced neural input to the system
- Decrease in twitch potentiation
- Increase in Ca2+ concentration at the myofilaments (correct)
- Reduction in myosin light-chain phosphorylation
Which of the following statements best describes the effects of muscle potentiation on force production?
Which of the following statements best describes the effects of muscle potentiation on force production?
What are the two likely mechanisms responsible for muscle potentiation during high-intensity contractions?
What are the two likely mechanisms responsible for muscle potentiation during high-intensity contractions?
What limits the ability to continually flex a finger under a fixed load according to the text?
What limits the ability to continually flex a finger under a fixed load according to the text?
What is one of the factors affected by metabolic perturbations that can lead to reduced force output?
What is one of the factors affected by metabolic perturbations that can lead to reduced force output?
What is the big controversy mentioned in the text related to when discussing metabolites and their impact on the fatigue response?
What is the big controversy mentioned in the text related to when discussing metabolites and their impact on the fatigue response?
Why is it mentioned that finger flexion can still occur with electrical stimulation despite limitations within central systems?
Why is it mentioned that finger flexion can still occur with electrical stimulation despite limitations within central systems?
What does an increasing superimposed twitch throughout a fatiguing task indicate?
What does an increasing superimposed twitch throughout a fatiguing task indicate?
Which factor contributes to decreased muscle activation (reduced firing rates) with fatigue according to the text?
Which factor contributes to decreased muscle activation (reduced firing rates) with fatigue according to the text?
Is it favorable or unfavorable when firing rates decline as muscle contractile speed slows down?
Is it favorable or unfavorable when firing rates decline as muscle contractile speed slows down?
What is the main reason for reduced ROM due to fatigue in the text?
What is the main reason for reduced ROM due to fatigue in the text?
Which factor contributes to the inability to generate an initial force appropriate for a task in the text?
Which factor contributes to the inability to generate an initial force appropriate for a task in the text?
What is the primary reason why fatigue processes are not sustainable indefinitely according to the text?
What is the primary reason why fatigue processes are not sustainable indefinitely according to the text?
What contributes significantly to the reduction in muscle response force and contractile speed during maximal or high intensity exercise?
What contributes significantly to the reduction in muscle response force and contractile speed during maximal or high intensity exercise?
What is the relationship between firing rates and muscle speed according to the text?
What is the relationship between firing rates and muscle speed according to the text?
What mechanism may lead to a loss of force during sustained maximal contractions?
What mechanism may lead to a loss of force during sustained maximal contractions?
In sub-maximal tasks, what combination plays a role in generating force?
In sub-maximal tasks, what combination plays a role in generating force?
What is one cause for loss of force during sustained maximal exercise according to the text?
What is one cause for loss of force during sustained maximal exercise according to the text?
What is the effect of task specificity on force generation during submaximal intermittent exercise?
What is the effect of task specificity on force generation during submaximal intermittent exercise?
During maximal sustained exercise, what happens to EMG activity?
During maximal sustained exercise, what happens to EMG activity?
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