THE EFFECT OF SLEEP LOSS ON HIGH-INTENSITY EXERCISE AND RECOVERY

  • 1 January 1984
    • journal article
    • research article
    • Vol. 55  (11) , 1031-1035
Abstract
The cardiovascular and metabolic responses of 5 male subjects during submaximal exercise (80% .ovrhdot.VO2 max [maximum CO2 output]) were examined after 24 h of wakefulness. The protocol consisted of 2 sets of 2 trials separated by 7-10 days: 1st, a 20 min exercise bout, then a normal night''s sleep, followed by another 20 min of exercise; 2nd, a 20-min exercise bout, 24 h of wakefulness, then another 20 min exercise trail. Exercise ventilation, heart rate, and O2 uptake were not affected by sleep loss. However, sleep loss caused the recovery ventilation and O2 uptake to remain higher than normal during the slow phase of recovery. Blood glucose levels were greater during the sleep deprived trials compared to controls, but were simlar to controls 15 min after exercise. Blood lactates were lower at the end of exercise after sleep deprivation and remained lower during the recovery period. Changes in plasma volume were not affected by sleep loss. Although sleep loss may not overtly affect acute submaximal exercise performance, it attenuates the recovery process.

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