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Effects of differing heat and humidity on the performance and recovery from multiple high intensity, intermittent exercise bouts.
Int J Sports Med. 2000 Aug; 21(6):400-5.IJ

Abstract

The aim of this study was to determine the effects of different conditions of heat and humidity on two multiple bouts of high intensity cycling with 60 min recovery between each bout. Eight males (age: 25.5+/-1.8 yr, height: 179.0+/-3.7 cm; weight: 72.3+/-4.0 kg; VO2peak: 51.5+/-2.4 ml x kg(-1) x min(-1), Peak Aerobic Power: 366+/-13 W) volunteered for this study. After undertaking VO2peak testing, all participated randomly, in three consecutive 30 s Wingate tests in three different environmental conditions being: Normal (22 degrees C/30% RH), Wet (30 degrees C/85% RH), and Hot (40 degrees C/40% RH). Subjects were then monitored for the 60 min post-exercise period after which time they repeated the Wingate tests and were again monitored for 60 min. Blood samples were taken pre, immediately post exercise, and at 1, 5, 10, 15, 30, 45, and 60 min into each of the recovery periods and analysed for lactate, pH, and hematocrit. Heart rate was monitored continuously throughout exercise (5 s average) and recovery (60 s average). Weight was measured pre exercise and at 15, 30, 45, and 60 min post-exercise. Urine samples were collected at the same time and analysed for osmolality. The results of the experiment indicated that environmental conditions had no effect on the performance of either series 1 or 2 Wingate tests. Neither were there any changes in weight throughout the three conditions or across the condition. Post exercise pH levels were lower than pre exercise values (p < 0.0001) and the reverse was true for blood lactate levels (p < 0.0003). We conclude that anaerobic exercise is not unduly affected by hot or humid conditions when subjects can re-hydrate according to decreases in body weight.

Authors+Show Affiliations

Sports Science, Kingston University, England.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Clinical Trial
Controlled Clinical Trial
Journal Article

Language

eng

PubMed ID

10961514

Citation

Backx, K, et al. "Effects of Differing Heat and Humidity On the Performance and Recovery From Multiple High Intensity, Intermittent Exercise Bouts." International Journal of Sports Medicine, vol. 21, no. 6, 2000, pp. 400-5.
Backx K, McNaughton L, Crickmore L, et al. Effects of differing heat and humidity on the performance and recovery from multiple high intensity, intermittent exercise bouts. Int J Sports Med. 2000;21(6):400-5.
Backx, K., McNaughton, L., Crickmore, L., Palmer, G., & Carlisle, A. (2000). Effects of differing heat and humidity on the performance and recovery from multiple high intensity, intermittent exercise bouts. International Journal of Sports Medicine, 21(6), 400-5.
Backx K, et al. Effects of Differing Heat and Humidity On the Performance and Recovery From Multiple High Intensity, Intermittent Exercise Bouts. Int J Sports Med. 2000;21(6):400-5. PubMed PMID: 10961514.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of differing heat and humidity on the performance and recovery from multiple high intensity, intermittent exercise bouts. AU - Backx,K, AU - McNaughton,L, AU - Crickmore,L, AU - Palmer,G, AU - Carlisle,A, PY - 2000/8/29/pubmed PY - 2001/2/28/medline PY - 2000/8/29/entrez SP - 400 EP - 5 JF - International journal of sports medicine JO - Int J Sports Med VL - 21 IS - 6 N2 - The aim of this study was to determine the effects of different conditions of heat and humidity on two multiple bouts of high intensity cycling with 60 min recovery between each bout. Eight males (age: 25.5+/-1.8 yr, height: 179.0+/-3.7 cm; weight: 72.3+/-4.0 kg; VO2peak: 51.5+/-2.4 ml x kg(-1) x min(-1), Peak Aerobic Power: 366+/-13 W) volunteered for this study. After undertaking VO2peak testing, all participated randomly, in three consecutive 30 s Wingate tests in three different environmental conditions being: Normal (22 degrees C/30% RH), Wet (30 degrees C/85% RH), and Hot (40 degrees C/40% RH). Subjects were then monitored for the 60 min post-exercise period after which time they repeated the Wingate tests and were again monitored for 60 min. Blood samples were taken pre, immediately post exercise, and at 1, 5, 10, 15, 30, 45, and 60 min into each of the recovery periods and analysed for lactate, pH, and hematocrit. Heart rate was monitored continuously throughout exercise (5 s average) and recovery (60 s average). Weight was measured pre exercise and at 15, 30, 45, and 60 min post-exercise. Urine samples were collected at the same time and analysed for osmolality. The results of the experiment indicated that environmental conditions had no effect on the performance of either series 1 or 2 Wingate tests. Neither were there any changes in weight throughout the three conditions or across the condition. Post exercise pH levels were lower than pre exercise values (p < 0.0001) and the reverse was true for blood lactate levels (p < 0.0003). We conclude that anaerobic exercise is not unduly affected by hot or humid conditions when subjects can re-hydrate according to decreases in body weight. SN - 0172-4622 UR - https://www.unboundmedicine.com/medline/citation/10961514/Effects_of_differing_heat_and_humidity_on_the_performance_and_recovery_from_multiple_high_intensity_intermittent_exercise_bouts_ L2 - http://www.thieme-connect.com/DOI/DOI?10.1055/s-2000-3833 DB - PRIME DP - Unbound Medicine ER -