EFFECT OF SHORT-TERM HEAT ACCLIMATION TRAINING ON KINETICS OF LACTATE REMOVAL FOLLOWING MAXIMAL EXERCISE

Details

• Alternative Title:
  J Sports Med Phys Fitness
• Personal Author:
  DiLeo, T.D. ; Powell, J.B. ; Kang, H-K. ; Roberge, R.J. ; Coca, A. ; Kim, J-H.
• 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:
  Acclimatization Exercise Exercise Test Heart Rate Hot Temperature Humans Kinetics Lactic Acid Male Sweating Young Adult

  More +
• 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
• Volume:
  56
• 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:
  [PDF - 372.20 KB ]