Effects of calf muscle conditioning upon ankle proprioception

Area of Science:

• Biomechanics
• Neuroscience
• Human Movement Science

Background:

• Ankle proprioception is vital for maintaining balance.
• Accurate proprioceptive input relies on calf muscle spindle function.
• Muscle spindle input depends on surrounding muscle tissue properties.

Purpose of the Study:

• To investigate the effects of prior muscle cooling, stretch, and contraction on ankle proprioception.
• To determine how altered muscle properties influence ankle joint position matching performance.
• To assess the relevance of these changes for postural balance.

Main Methods:

• A contralateral ankle joint matching task was performed without vision.
• Participants' right ankle was rotated, and they matched the position with their left ankle.
• Interventions included calf muscle contraction, passive stretch, and lower leg cooling (≤ 5°C for 10 minutes).

Main Results:

• Muscle stretch induced a significant bias (0.89 ± 0.6°) in perceived ankle position.
• Muscle cooling increased joint matching error by approximately 0.4° due to bias and variability.
• Muscle contraction had no significant effect on task performance.

Conclusions:

• Conditioning of the triceps surae muscles can alter the perception of ankle joint position.
• The observed changes in proprioception are significant enough to potentially affect balance during quiet stance.
• These findings highlight the sensitivity of proprioception to muscle physiological and mechanical states.