Neuromuscular function during knee extension exercise after cold water immersion
Wakabayashi H, Wijayanto T, Tochihara Y
Journal of physiological anthropology · 12 citations
How it was studied
- Design
- Controlled clinical trial (classified by our AI screen)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Independent funding
- Government
- Japan Society for the Promotion of Science
- Grants
- Japan Society for the Promotion of Science (09J03584); Japan Society for the Promotion of Science (15K12671)
Based on 1 listed funder(s) and full-text disclosure statement.
Publication
- Published
- 2017-06-23 · J Physiol Anthropol · vol. 36 · issue 1 · p. 28
- Publisher
- BioMed Central
- Cited
- 20 citations · more than 65% of similar papers · 0.4× the field average
- References
- 39 works
- Access
- Open access (journal) · CC-BY
- Research areas
- Exercise and Physiological Responses · Cardiovascular and exercise physiology · Sports Performance and Training
- Keywords
- Isometric exercise, Immersion (mathematics), Medicine, Electromyography, Physical medicine and rehabilitation, Physical therapy, Anesthesia, Mathematics
- MeSH
- knee, muscle, skeletal, humans, electromyography, hypothermia, induced, muscle contraction, adult, male, cold temperature, young adult
3 authors
From JP, ID
- Hitoshi Wakabayashi · correspondingHokkaido University
- Titis WijayantoUniversitas Gadjah Mada
- Yutaka TochiharaKyushu University
Abstract
Background
Human adaptability to cold environment has been focused on in the physiological anthropology and related research area. Concerning the human acclimatization process in the natural climate, it is necessary to conduct a research assessing comprehensive effect of cold environment and physical activities in cold. This study investigated the effect of cold water immersion on the exercise performance and neuromuscular function during maximal and submaximal isometric knee extension.
Methods
Nine healthy males participated in this study. They performed maximal and submaximal (20, 40, and 60% maximal load) isometric knee extension pre- and post-immersion in 23, 26, and 34 °C water. The muscle activity of the rectus femoris (RF) and vastus lateralis (VL) was measured using surface electromyography (EMG). The percentages of the maximum voluntary contraction (%MVC) and mean power frequency (MPF) of EMG data were analyzed.
Results
The post-immersion maximal force was significantly lower in 23 °C than in 26 and 34 °C conditions (P < 0.05). The post-immersion %MVC of RF was significantly higher than pre-immersion during 60% maximal exercise in 23 and 26 °C conditions (P < 0.05). In the VL, the post-immersion %MVC was significantly higher than pre-immersion in 23 and 26 °C conditions during 20% maximal exercise and in 26 °C at 40 and 60% maximal intensities (P < 0.05). The post-immersion %MVC of VL was significantly higher in 26 °C than in 34 °C at 20 and 60% maximal load (P < 0.05). The post-immersion MPF of RF during 20% maximal intensity was significantly lower in 23 °C than in 26 and 34 °C conditions (P < 0.05), and significantly different between three water temperature conditions at 40 and 60% maximal intensities (P < 0.05). The post-immersion MPF of VL during three submaximal trials were significantly lower in 23 and 26 °C than in 34 °C conditions (P < 0.05).
Conclusions
The lower shift of EMG frequency would be connected with the decrease in the nerve and muscle fibers conduction velocity. To compensate for the impairment of each muscle fibers function, more muscle fibers might be recruited to maintain the working load. This might result in the greater amplitude of EMG after the cold immersion.
Abstract via Europe PMC. Copyright remains with the authors or publisher (CC BY).
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