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Neuromuscular function during knee extension exercise after cold water immersion.

Hitoshi Wakabayashi¹, Titis Wijayanto², Yutaka Tochihara³

¹Laboratory of Environmental Ergonomics, Faculty of Engineering, Hokkaido University, N13 W8, Kita-ku, Sapporo, 060-8628, Hokkaido, Japan. wakabayashi@eng.hokudai.ac.jp.

Journal of Physiological Anthropology

|June 25, 2017

Summary

Cold water immersion impacts exercise performance and neuromuscular function. Lower water temperatures significantly reduce maximal force and alter muscle activation patterns, suggesting recruitment of more muscle fibers to compensate for reduced nerve and muscle conduction velocity.

Keywords:

Cold water immersion Electromyography Hypothermic skeletal muscle Mean power frequency

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Area of Science:

Physiological Anthropology
Exercise Physiology
Sports Science

Background:

Human adaptability to cold environments is a key area in physiological anthropology.
Understanding cold acclimatization requires assessing the combined effects of cold exposure and physical activity.
This study specifically examines cold water immersion's impact on exercise and neuromuscular responses.

Purpose of the Study:

To investigate the effects of cold water immersion on maximal and submaximal isometric knee extension performance.
To analyze the impact of varying water temperatures on neuromuscular function during exercise.
To assess changes in muscle activity and conduction velocity post-immersion.

Main Methods:

Nine healthy males underwent isometric knee extension tests (maximal and submaximal loads).
Participants were immersed in water at 23°C, 26°C, and 34°C before testing.
Surface electromyography (EMG) measured rectus femoris and vastus lateralis activity, analyzing %MVC and MPF.

Main Results:

Maximal force decreased significantly in 23°C water compared to 26°C and 34°C.
Post-immersion, %MVC increased in rectus femoris and vastus lateralis at lower temperatures and intensities.
EMG mean power frequency (MPF) decreased significantly in colder water, indicating reduced nerve and muscle conduction velocity.

Conclusions:

Reduced EMG frequency correlates with decreased nerve and muscle fiber conduction velocity in cold water.
Increased muscle fiber recruitment may compensate for impaired muscle function to maintain exercise load.
Cold water immersion affects neuromuscular control and exercise capacity, with effects varying by temperature.