Sandrine Dupont Rocher1, Nicolas Bessot2, Bruno Sesboüé3, Jan Bulla4, Damien Davenne5. 1. INSERM, U1075 COMETE, Caen, France. 2. INSERM, U1075 COMETE, Caen, France. Université de Caen Basse-Normandie, U1075 COMETE, France. Bessot-n@phycog.org. 3. INSERM, U1075 COMETE, Caen, France. Department of Functional Explorations, CHU de Caen, France. 4. Department of Mathematics, University of Bergen, Norway. 5. INSERM, U1075 COMETE, Caen, France. Université de Caen Basse-Normandie, U1075 COMETE, France.
Abstract
BACKGROUND: Alteration of circadian rhythmicity with aging might depend on physical aerobic capacity. METHODS: Three groups of participants were established based on their peak oxygen consumption (Group 1 < 20mL/min/kg; Group 2 > 20mL/min/kg and <30mL/min/kg; Group 3 > 30mL/min/kg). Each participant had an individual evaluation of their circadian rhythmicity characteristics through two well-known circadian rhythms: core temperature and rest/activity cycles. Nocturnal sleep was also recorded using actimetry and diurnal vigilance tested in a car driving simulator. RESULTS: The amplitude of the oral temperature fluctuations for Group 1 is significantly lower (p < .05) than that of Group 3. Group 2 (p < .01) and Group 3 (p < .05) were significantly more active during the day than Group 1. The index of inactivity during the night for Groups 2 (p < .05) and 3 (p < .01) was higher than Group 1. Results of the car driving simulation showed that for Group 1, the number of lane crossings was significantly higher than Groups 2 (p < .01) and 3 (p < .01). In addition, diurnal vigilance was lower in Group 1. CONCLUSIONS: The biological clock seems to be enhanced in older participants with a higher level of physical capacity.
BACKGROUND: Alteration of circadian rhythmicity with aging might depend on physical aerobic capacity. METHODS: Three groups of participants were established based on their peak oxygen consumption (Group 1 < 20mL/min/kg; Group 2 > 20mL/min/kg and <30mL/min/kg; Group 3 > 30mL/min/kg). Each participant had an individual evaluation of their circadian rhythmicity characteristics through two well-known circadian rhythms: core temperature and rest/activity cycles. Nocturnal sleep was also recorded using actimetry and diurnal vigilance tested in a car driving simulator. RESULTS: The amplitude of the oral temperature fluctuations for Group 1 is significantly lower (p < .05) than that of Group 3. Group 2 (p < .01) and Group 3 (p < .05) were significantly more active during the day than Group 1. The index of inactivity during the night for Groups 2 (p < .05) and 3 (p < .01) was higher than Group 1. Results of the car driving simulation showed that for Group 1, the number of lane crossings was significantly higher than Groups 2 (p < .01) and 3 (p < .01). In addition, diurnal vigilance was lower in Group 1. CONCLUSIONS: The biological clock seems to be enhanced in older participants with a higher level of physical capacity.
Authors: Miki Sato; Feni Betriana; Ryuichi Tanioka; Kyoko Osaka; Tetsuya Tanioka; Savina Schoenhofer Journal: Int J Environ Res Public Health Date: 2021-12-07 Impact factor: 3.390