Effects of phySical activity on muscle oxygenation during sprinting in adolescents
Shinya KUNO, Hikaru HISAEDA*, Haruo OZAWA** and Tetsuo FUKUNAGA
The effect of school club activities on muscle oxygenation during sprint running was investigated. Muscle oxygenation (% deoxygenation relative to oxygen capacity and blood volume) during 5 periods of intermittent sprinting was measured using near-infrared spectroscopy (portable) . Blood lactate also was measured after sprints. The subjects were divided into 3 groups : 13 years old (sedentary) , 17 years old (trained) , and adult (sedentary) . We demonstrated a significant relation-ship between % deoxygenation relative to oxygen capacity and sprint time in all subjects in the 17 -years-old group (trained) . The 13-year-old group (sedentary) did not show a significant correla-tion. These results suggested that sprint ability is affected by muscle oxygenation during sprinting and physical activity improves muscle oxygenation in adolescents children.