010-111 · Question #71
Neural mechanisms responsible for adaptations in strength and power include all of the following EXCEPT an increased _____.
The correct answer is B. antagonist muscle coactivation. Increased antagonist coactivation opposes agonist force production and is not a beneficial neural adaptation; training actually reduces antagonist coactivation to improve movement efficiency.
Question
Neural mechanisms responsible for adaptations in strength and power include all of the following EXCEPT an increased _____.
Options
- Amotor unit recruitment
- Bantagonist muscle coactivation
- Cmotor unit firing rate
- Dfast-twitch fiber recruitment
How the community answered
(59 responses)- A7% (4)
- B71% (42)
- C3% (2)
- D19% (11)
Why each option
Increased antagonist coactivation opposes agonist force production and is not a beneficial neural adaptation; training actually reduces antagonist coactivation to improve movement efficiency.
Increased motor unit recruitment is a well-established neural adaptation that allows more muscle fibers to be activated simultaneously for greater force output.
With progressive resistance training, antagonist coactivation decreases rather than increases, allowing the primary movers to generate force without opposing resistance from the antagonist muscles; an increase in antagonist coactivation would reduce net joint torque and impair rather than enhance strength and power expression.
Increased motor unit firing rate (rate coding) is a primary neural mechanism enabling the CNS to summate force from individual motor units into a stronger overall contraction.
Preferential recruitment of fast-twitch (Type II) motor units is a key neural adaptation associated with high-intensity strength and power training.
Concept tested: Neural adaptations to resistance training - antagonist coactivation
Source: https://www.acsm.org/education-resources/books/acsms-foundations-strength-training-conditioning
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