Details:

Alternative Title:
J Sports Med Phys Fitness
Personal Author:
DiLeo, T.D. ; Powell, J.B. ; Kang, H-K. ; Roberge, R.J. ; Coca, A. ; ... More +
DiLeo, T.D. ; Powell, J.B. ; Kang, H-K. ; Roberge, R.J. ; Coca, A. ; Kim, J-H. Less -
Description:
AIM

Heat acclimation (HA) evokes numerous physiological adaptations, improves heat tolerance and has also been shown to enhance lactate (LA) responses during exercise, similar to that seen with endurance training. The purpose of this study was to examine whether HA improves the body’s ability to remove LA during recovery following maximal exercise.

METHODS

Ten healthy men completed two trials of maximal treadmill exercise (PRE- and POST-HA) separated by 5 days of HA. Each day of HA consisted of two 45 minute periods of cycling at ~50% VO2max separated by a 15min rest period in an environmental chamber (Tdb 45°C, RH 20%). In PRE-/POST-HA trials, venous blood was collected during 60 minutes of recovery to determine LA concentrations and removal kinetics (A2: amplitude and y2: velocity constant) using bi-exponential curve fitting.

RESULTS

Physiological adaptation to heat was significantly developed during HA, as evidenced by end-exercise Tre (DAY 1 vs. 5) (38.89±0.56 vs. 38.66±0.44 °C), Tsk (38.07±.51 vs. 37.66±.48 °C), HR (175.0±9.9 vs. 165.0±18.5 beats·min−1), and sweat rate (1.24 ±.26 vs. 1.47 ±.27 L·min−1) (p<.05). However, there was no significant difference in either LA concentrations (LA0min: 8.78±1.08 vs. 8.69±1.23; LApeak: 10.97±1.77 vs. 10.95±1.46; and La60min; 2.88±.82 vs. 2.96±.93 mmol·L−1) or removal kinetics (A2: −13.05±7.05 vs −15.59±7.90 mmol.L−1 and y2: .02±.01 vs .03±.01 min−1).

CONCLUSION

The present study concluded that, while effective in inducing thermo-physiological adaptations to heat stress, short-term HA does not improve the body’s ability to remove LA following maximal exercise. Therefore, athletes and workers seeking faster LA recovery from intense physical activity may not benefit from short-term HA.


Subjects:
[+]
Article Heat Adaptation Heat Stress Lactate Recovery Lactic Acidosis Performance
Source:
J Sports Med Phys Fitness. 56(1-2):70-78.
Pubmed ID:
25286892
Pubmed Central ID:
PMC4864577
Document Type:
Journal Article
Funding:
CC999999/Intramural CDC HHS/United States
Collection(s):
CDC Public Access
Main Document Checksum:
[+]
urn:sha256:baf7055d39f9e8e1719f69c4dd3080cb688f657fa2adfd4c5ede7500fc6cdaa5
Download URL:
https://stacks.cdc.gov/view/cdc/39453/cdc_39453_DS1.pdf
File Type:

Supporting Files

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