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Guidelines for optimizing heat acclimatization

Guidelines for optimizing heat acclimatization
Acclimatization should be performed gradually over 10-14 consecutive days
Environment Reflects the environment that will be encountered during goal activity
Warm or hot (WBGT >26°C)
Relative humidity reflects the humidity that will be encountered
If necessary environmental conditions not present, add clothing or exercise during hottest/most humid part of the day
Exercise session Duration: >60 minutes
Type: aerobic
Intensity: moderate intensity (should progress from 60-80 percent age-predicted maximum heart rate)
Frequency: one session per day (may progress to two sessions per day alternating with a single session day)
Hydration Urine specific gravity: <1.020
Urine osmolality: <700
Urine color: <3 (using 8 color scale)
Safety Monitor temperature with rectal or gastrointestinal thermistor (<40°C)
Monitor athlete for signs and symptoms of heat illness
Monitor heart rate for increased intensity (>80 percent age-predicted maximum)
Avoid interval training at race speeds (may be performed separately in a cooler environment)
Calculate sweat rate: pre-exercise nude body mass (kg) - post-exercise nude body mass (kg) + fluid ingested (L) per exercise time (hour) = sweat rate (L/hour)
Keep athlete well hydrated before and during exercise (<2 percent dehydrated)
Training intensity should correspond with fitness level
References:
  1. Daanen HAM, Jonkman AG, Layden JD, et al. Optimising the acquisition and rentention of heat acclimation. Int J Sports Med 2011; 32:822-828.
  2. Cheung SS. Heat Stress. Advanced Environmental Exercise Physiology. Champaign, IL:Human Kinetics; 2010.
  3. Kuennen M, Gillum T, Dokladny K, et al. Thermotolerance and heat acclimation may share a common mechanism in humans. Am J Physiol Regul Integr Comp Physiol 2011; 301: R524-R533.
  4. Armstrong LE, Maresh CM, Castellani JW, et al. Urineary indices of hydration status. Int J Sport Nutr 1992; 4:265.
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