کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7295443 1474409 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of heat acclimation on time perception
ترجمه فارسی عنوان
اثرات تسریع گرما در ادراک زمان
کلمات کلیدی
ادراک زمان، تولید فاصله، ساعت داخلی انعطاف پذیری گرما، ضربان قلب، دمای هسته، پرولاکتین،
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
چکیده انگلیسی
Cognitive performance is impaired during prolonged exercise in hot environment compared to temperate conditions. These effects are related to both peripheral markers of heats stress and alterations in CNS functioning. Repeated-exposure to heat stress results in physiological adaptations, and therefore improvement in exercise capacity and cognitive functioning are observed. The objective of the current study was to clarify the factors contributing to time perception under heat stress and examine the effect of heat acclimation. 20 young healthy male subjects completed three exercise tests on a treadmill: H1 (at 60% VO2peak until exhaustion at 42 °C), N (at 22 °C; duration equal to H1) and H2 (walk until exhaustion at 42 °C) following a 10-day heat acclimation program. Core temperature (TC) and heart rate (HR), ratings of perceived fatigue and exertion were obtained continuously during the exercise, and blood samples of hormones were taken before, during and after the exercise test for estimating the prolactin, growth hormone and cortisol response to acute exercise-heat stress. Interval production task was performed before, during and after the exercise test. Lower rate of rise in core temperature, heart rate, hormone response and subjective ratings indicated that the subjects had successfully acclimated. Before heat acclimation, significant distortions in produced intervals occurred after 60 minutes of exercise relative to pre-trial coefficients, indicating speeded temporal processing. However, this effect was absent after in acclimated subjects. Blood prolactin concentration predicted temporal performance in both conditions. Heat acclimation slows down the increase in physiological measures, and improvement in temporal processing is also evident. The results are explained within the internal clock model in terms of the pacemaker-accumulator functioning.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Psychophysiology - Volume 95, Issue 3, March 2015, Pages 261-269
نویسندگان
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