Cardiorespiratory Response to Low-Intensity Walking in Water and on Land in Elderly Women

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The purpose of the present study was to determine whether or not the exercise intensity of water -walking for elderly women could be accurately prescribed by heart rate data obtained during treadmill exercise on land. Six healthy female volunteers' with a mean age of 62.2 ±4.2 years, took part in this study. Walking on land was performed on a treadmill. Each subject completed three consecutive 4-minute walks at a progressively increasing velocity (40, 60 and 80 m・min^<-1>), with a 1-minute rest after both the first and second walks. The room temperature and relative humidity were 24.5±0.2℃ and 54.8±4.0%, respectively. Walking in water was performed in a Flowmill, which is a treadmill positioned at the base of a water flume. Each subject completed three consecutive 4-minute wlks at a progressively increasing belt and water-flow velocity(20, 30 and 40 m・min^<-1>), with a 1-minute rest after both the first and second walks. The water depth was at the level of the xiphoid process of each subject. The water temperature was 30.7±0.1℃. The exercise intensity at the highest workrate was equivalent to 44.2±10.3% of the heart rate reserve (HRR) during water-walking and 38.4±4.7% of the HRR during land-walking. There was a highly significant linear relationship between heart rate (HR) and oxygen uptake(V^^・O_2) during both water-walking and land-walking. The relationship between HR and V^^・O_2 in both exercise modes was similar. Thus, the relationship of HR to V^^・O_2 derived from a treadmill-graded walking test on land may be used to prescribe exercise intensity for water-walking in thermoneutral water.
日本生理人類学会の論文

Cardiorespiratory Response to Low-Intensity Walking in Water and on Land in Elderly Women

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