Muscle Oxygenation during Repeated Cycling Sprints in a Combined Hot and Hypoxic Condition
Int J Sports Med DOI: 10.1055/a-1495-5612The aim of the present study was to examine the effects of a combined hot and
hypoxic environment on muscle oxygenation and performance during repeated
cycling sprints. In a single-blind, counterbalanced, cross-over research design,
10 male athletes performed three sets of 3 × 10-s maximal pedaling
interspersed with 40-s recovery between sprints under four different
environments. Each condition consisted of a control (CON; 20°C,
20.9% FiO2), normobaric hypoxia (HYP; 20°C,
14.5% FiO2), hot (HOT; 35°C, 20.9%
FiO2), and combined hot and normobaric hypoxia (HH; 35°C,
14.5% FiO2). Power output and vastus lateralis muscle
oxygenation were measured. Peak power output was significantly higher in HOT
(892±27 W) and HH (887±24 W) than in CON
(866±25 W) and HYP (859±25 W) during the first
set (p<0.05). The increase in total hemoglobin during recovery periods
was larger in HH than in HYP (p<0.05), while change in tissue saturation
index was smaller in HYP than in CON and HOT (p<0.05). The findings
suggest that the combination of hot and hypoxia during repeated cycling sprints
presented different characteristics for muscle metabolism and power output
compared to temperature or altitude stressor alone. [...] Georg Thieme Verlag Rüdigerstraße 1...
Source: International Journal of Sports Medicine - Category: Sports Medicine Authors: Yamaguchi, Keiichi Kasai, Nobukazu Hayashi, Nanako Yatsutani, Haruka Girard, Olivier Goto, Kazushige Tags: Training & Testing Source Type: research
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