Mind, muscles and motoneurones.

Area of Science:

• Neuroscience
• Exercise Physiology
• Motor Control

Background:

• The central nervous system (CNS) plays a crucial role in regulating musculoskeletal system performance.
• Understanding neural adaptations is key to optimizing physical efforts, from low-intensity to maximal contractions.

Purpose of the Study:

• To review central nervous system adaptations for optimal musculoskeletal performance across varying effort levels.
• To explore the mechanisms behind mental imagery's effect on exercise performance.
• To examine neural factors contributing to force maintenance during fatigue and their impact on motor output.

Main Methods:

• Literature review of studies on central nervous system adaptations and motor control.
• Analysis of research on mental imagery and its physiological effects.
• Examination of findings related to neural drive, muscle fatigue, and motor cortex excitability.

Main Results:

• Mental imagery can enhance performance by evoking muscle contractions and activating receptors.
• Specific muscle control is possible without sensory feedback.
• Maximal voluntary contractions ensure full muscle force production via motoneurone activation.
• Neural factors, including feedback loops, maintain force during repetitive activity and enhance muscle perfusion during fatigue.
• Peripheral fatigue leads to changes in motor cortex excitability, with central factors potentially acting upstream of motor cortical output.

Conclusions:

• The CNS employs diverse strategies, including mental imagery and modulation of central drive, to optimize musculoskeletal function.
• Neural adaptations are critical for sustained force production and adapting to fatigue.
• Further research is needed to fully elucidate the upstream mechanisms influencing motor output during fatigue.