Which combination of neural adaptations contributes to augmented neural drive after resistance training?

Which combination of neural adaptations contributes to augmented neural drive after resistance training?

• A. Increased agonist recruitment
• B. Improved firing rate
• C. Increased agonist recruitment, improved firing rate, and greater synchronization
• D. Muscle hypertrophy

Answer: (C)

Neural drive to a muscle increases when the nervous system becomes more efficient at activating motor units. After resistance training, this efficiency comes from three linked adaptations: recruiting more motor units, increasing the firing rate of those units (rate coding), and better synchronizing their firing. Recruiting more motor units expands the pool of fibers contributing to force, raising the overall neural signal reaching the muscle. Higher firing rates boost the force produced by each active unit and improve the temporal summation of their contractions. Greater synchronization aligns motor unit discharges in time, so their individual forces add more constructively, especially during heavier or faster movements. Together, these changes yield a larger and more consistent neural drive than any single adaptation alone. Muscle hypertrophy, while increasing force capacity through greater muscle size, is a muscular adaptation and does not directly reflect neural drive.

Neural drive to a muscle increases when the nervous system becomes more efficient at activating motor units. After resistance training, this efficiency comes from three linked adaptations: recruiting more motor units, increasing the firing rate of those units (rate coding), and better synchronizing their firing. Recruiting more motor units expands the pool of fibers contributing to force, raising the overall neural signal reaching the muscle. Higher firing rates boost the force produced by each active unit and improve the temporal summation of their contractions. Greater synchronization aligns motor unit discharges in time, so their individual forces add more constructively, especially during heavier or faster movements. Together, these changes yield a larger and more consistent neural drive than any single adaptation alone. Muscle hypertrophy, while increasing force capacity through greater muscle size, is a muscular adaptation and does not directly reflect neural drive.