Abstract
The effects of physical work (30% of\(\dot VO_2 \) max), sleep loss (3-h nap during a 48-h operation), continuous work (CW), and time of day on cognitive performance were assessed (by ANOVA) in this repeated-measures study comparing two groups (exercise/nonexercise) of healthy young men (N=22). Treadmill walking did not accentuate or attenuate sleep loss effects on performance; however, sleep loss alone did degrade visual vigilance and memory for words. Time-of-day fluctuations were found in choice reaction time, logical reasoning, and word memory. Visual vigilance for nonexercising subjects degraded sooner on the 2nd CW day than it did for exercising subjects. A 3-h nap at 0400 h after 1 17-h CW day was not immediately recuperative. These findings indicate that exercise at 30% of\(\dot VO_2 \) max does not compound sleep-loss effects in cognitive performance. Indeed, physical activity during video terminal monitoring may delay any sleep-loss decrement. Variability of many cognitive abilities throughout the day appeared to show a greater effect than the sleep-loss and exercise effects over 2 days.
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The work reported here was accomplished by the Naval Medical Research and Development Command under Work Unit MF58.528.01B-0003 and reported as NHRC Technical Report No. 84-31. The views presented in this paper are those of the authors. No endorsement by the Department of the Navy has been given or should be inferred. The authors gratefully acknowledge the assistance of members of the First Marine Reconnaissance Battalion of Camp Pendleton, CA, who were subjects in this study. We would also like to thank Louise Jarrett for her editorial assistance in preparing this manuscript.
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Englund, C.E., Ryman, D.H., Naitoh, P. et al. Cognitive performance during successive sustained physical work episodes. Behavior Research Methods, Instruments, & Computers 17, 75–85 (1985). https://doi.org/10.3758/BF03200899
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DOI: https://doi.org/10.3758/BF03200899