Neural adaptations to resistive exercise: mechanisms and recommendations for training practices.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing mechanistic concepts without systematic search criteria.
PubMed 16464122 · doi:10.2165/00007256-200636020-00004
What was done
This narrative review synthesized literature on the neural mechanisms responsible for muscle strength adaptations following resistance training and formulated practical recommendations for sports medicine and rehabilitation.
What was found
The abstract reports no quantitative numerical data. It notes that early strength gains occur without noticeable muscle hypertrophy and coincide with increased surface electromyography (SEMG) amplitude and motor unit firing rates. Increases in the rate of tension development are linked to motor unit doublet firing, whereas motor unit synchronization remains unproven. Central adaptations include increased cortical excitability from mental practice and cross-education to the untrained contralateral limb. Bilateral deficits and lower SEMG in eccentric actions can be reversed with training. Peripheral adaptations remain uncertain, with conflicting findings regarding whether antagonist co-activation increases to stabilize joints or decreases to maximize net force.
Why it matters
Understanding the neural drivers of force production allows clinicians and coaches to apply targeted methods—such as imagined contractions, cross-education, and antagonist-agonist proprioceptive neuromuscular facilitation—to maintain strength during immobilization or prevent falls in older adults.
Limits
The abstract provides no sample sizes, effect sizes, statistical measures, or systematic review methodology. Several proposed mechanisms (including motor unit synchronization and peripheral sensory disinhibition) remain unconfirmed, and the trade-off between joint integrity and force optimization by the central nervous system is unresolved.
Cited by
- supports The initial gains in strength during the first several weeks of resistance training are predominantly driven by neuromuscular adaptations rather than muscle hypertrophy.