Chronobiological Effects on Mountain Biking Performance

António Silveira, Francisco Alves, Ana M. Teixeira and Luís Rama
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António Silveira: Research Center for Sport and Physical Activity (CIDAF), Faculty of Sports Science, University of Coimbra, 3004-531 Coimbra, Portugal
Francisco Alves: Interdisciplinary Centre for the Study of Human Performance (CIPER), Faculty of Human Kinetics, University of Lisboa, 1495-751 Cruz Quebrada, Portugal
Ana M. Teixeira: Research Center for Sport and Physical Activity (CIDAF), Faculty of Sports Science, University of Coimbra, 3004-531 Coimbra, Portugal
Luís Rama: Research Center for Sport and Physical Activity (CIDAF), Faculty of Sports Science, University of Coimbra, 3004-531 Coimbra, Portugal

IJERPH, 2020, vol. 17, issue 18, 1-9

Abstract: Background: the aim of this study was to analyze the chronobiology influence on the mechanical, kinematic, and physiological variables in a mountain bike (MTB) time trial. Methods: 16 mountain bike (MTB) male athletes volunteered to participate. Their characteristics were as follows: body mass 70.2 ± 5.4 kg, stature 172.7 ± 4.0 cm, body fat 9.8 ± 3.5%, and VO 2max 52.3 ± 3.9 mL/kg/min. Two 20 min MTB maximal protocols were applied, the first one in the morning and a second one in the afternoon period. Results: No differences were found for all the variables studied, except for the pedaling cadence (stroke rate), which showed higher values during the morning protocol (85.06 ± 7.58 vs. 82.63 ± 7.41 rpm; p = 0.044). Significant correlations between morning and afternoon physiological and mechanical variables were observed: heart rate ( r = 0.871); external mechanical power—maximum ( r = 0.845), mean ( r = 0.938), and relative ( r = 0.933), as well as in the cadence—stroke rate ( r = 0.825). Conclusions: our results reveal a similar impact and significant relationship between morning and afternoon impact concerning the majority of the physiological and mechanical variables, which indicates that the period of the day does not influence the external and internal impact associated with the MTB time trial maximal protocol.

Keywords: circadian rhythm; cycling; MTB; mechanical power; heart rate (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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