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Title: Chronobiological Effects on Mountain Biking Performance
Authors: Silveira, António 
Alves, Francisco 
Teixeira, Ana Maria 
Rama, Luís 
Keywords: circadian rhythm;; cycling;; MTB;; mechanical power;; heart rate
Issue Date: 4-Sep-2020
Publisher: MDPI
Project: uid/dtp/04213/2016 
Serial title, monograph or event: International Journal of Environmental Research and Public Health
Volume: 17
Issue: 18
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 VO2max 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 di erences 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.
ISSN: 1660-4601
DOI: 10.3390/ijerph17186458
Rights: openAccess
Appears in Collections:I&D CIDAF - Artigos em Revistas Internacionais

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