NDLI: Heat acclimation does not reduce the impact of hyperthermia on central fatigue

Content Provider	Springer Nature Link
Author	Brazaitis, Marius Skurvydas, Albertas
Copyright Year	2010
Abstract	We tested the hypothesis that improved physiological symptoms of passively induced heat acclimation (HA) might impair the impact of hyperthermia on central fatigue and consequently cause greater peripheral fatigue. Subjects in the experimental group (7 males and 6 females) completed seven sessions of HA involving passive heating of the lower body by immersion up to the waist in a water bath at ~44°C (air T 23°C, rh 40%) for 45 min, repeated every other day for 2 weeks. During the first and the last HA sessions, participants performed a 2-min MVC of the knee extensors. A TT100 Hz was superimposed on the contraction at about 3, 14, 29, 44, 59, 74, 89, 104, and 119 s. At about 30, 60, 90, and 120 s, the knee extensors were relaxed for 2–3 s and a control TT100 Hz was delivered. The participants in the control group (6 males and 6 females) followed the same exercise protocol on days 1 and 14 in a thermoneutral condition. Peak torque and the muscle voluntary activation and half-relaxation time were assessed during the exercise. The attainment of HA was confirmed by significant decreases in the resting and final rectal temperatures (~0.3°C), heart rate, and physiological stress index, and increased sweating capacity. Lower-body heating resulted in greater central and peripheral fatigue when compared with the thermoneutral condition during the 2-min MVC. Following HA, central and peripheral fatigues were unchanged. We conclude that passively induced HA for 2 weeks improved the physiological symptoms, but did not change central or peripheral fatigue during exercise in hyperthermia.
Starting Page	771
Ending Page	778
Page Count	8
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	109
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-11
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Heat stress Passive heating Physiological stress index Rectal temperature Voluntary activation Sports Medicine Occupational Medicine/Industrial Medicine Human Physiology
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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