Exercise, fatigue and proprioception: a retrospective.

Area of Science:

• Neuroscience
• Human Physiology
• Exercise Science

Background:

• Intense exercise is known to cause clumsiness in skilled movements.
• Eccentric exercise can cause muscle damage, potentially affecting muscle spindles and limb position sense.

Purpose of the Study:

• To investigate the influence of exercise on human limb position sense.
• To determine if muscle damage from eccentric exercise or effort signals contribute to altered proprioception post-exercise.

Main Methods:

• Experiments over 20 years exploring exercise effects on limb position sense.
• Comparison of eccentric and concentric exercise impacts on elbow and knee position sense.
• Analysis of position errors in relation to muscle force reduction and perceived effort.

Main Results:

• No difference in position sense disturbance between eccentric and concentric exercise at severe intensities.
• Forearm consistently perceived as more extended after elbow exercise; lower leg perceived as more flexed after knee exercise.
• Findings suggest effort signals do not explain position sense disturbance in the elbow, but may contribute at the wrist.

Conclusions:

• Disturbances in limb position sense after exercise do not involve peripheral receptors.
• The observed proprioceptive deficits post-exercise likely arise within the central nervous system (brain).