Effects of Precooling on 30-km Cycling Performance and Pacing in Hot and Temperate Environments.

Autor: Maia-Lima A; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., Ramos GP; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., Moraes MM; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., Pacheco DA; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., de Oliveira GG; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., de Barros CL; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., Prado LS; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil., Garcia ES; Laboratory of Exercise Physiology, Federal University of Minas Gerais, Belo Horizonte, Brazil.
Jazyk: angličtina
Zdroj: International journal of sports medicine [Int J Sports Med] 2017 Jan; Vol. 38 (1), pp. 48-54. Date of Electronic Publication: 2017 Jan 10.
DOI: 10.1055/s-0042-113465
Abstrakt: This study examined the effects of precooling on performance and pacing during 30-km cycling exercise in hot and temperate environments. 8 trained male cyclists performed 4 trials involving either cooling (PREC TEMP and PREC HOT ) or no-cooling interventions (TEMP and HOT) prior to a 30-km self-paced cycling exercise in either a hot (35°C, 68% relative humidity) or temperate environment (24°C, 68% relative humidity). Exercise time was longer in HOT (60.62±3.47 min) than in TEMP (58.28±3.30 min; P <0.001), and precooling attenuated this thermal strain performance impairment (PREC HOT 58.28±3.30 min; P =0.048), but it was still impaired compared with TEMP ( P =0.02). Exercise performance in PREC TEMP (54.58±4.35 min) was no different from TEMP. Initial power output was sustained until the end of the exercise in both TEMP and PREC TEMP , but was reduced from the 12 th km until the end of the trial in HOT (P<0.05). This reduction was delayed by precooling because power output was reduced only after the 20 th km during PREC HOT (P<0.05). Heart rate was similar in all conditions throughout almost the entire exercise, suggesting the maintenance of similar relative intensities. In conclusion, precooling was effective in attenuating, but not completely reversing thermal strain performance impairment and offered no ergogenic effect in the temperate environment.
(© Georg Thieme Verlag KG Stuttgart · New York.)
Databáze: MEDLINE
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