除雪の作業条件と呼吸循環応答 [in Japanese] Working Conditions and Cardiorespiratory Responses during Snow Removal [in Japanese]
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本研究では，除雪の作業条件と呼吸循環応答について検討した。被験者は，健康な若年者群12名（平均年齢20.5 ± 1.0歳）と中高年者群11名（平均年齢49.2 ± 7.8歳）であった。ショベル除雪とダンプ除雪をマイペースで行い，作業条件と呼吸循環応答の指標について，若年者群と中高年者群とで比較検討した。ショベル除雪の投雪頻度は中高年者群より若年者群の方が有意に高値であった。ショベル除雪では，酸素摂取量と一回の投雪重量とに正の相関関係を示した。ダンプ除雪では，酸素摂取量と投雪頻度とに正の相関関係を示した。ショベル除雪とダンプ除雪の運動強度は若年者群と中高年者群とで有意な差を認めなかった。しかし，相対的強度は，中高年者群の方が若年者群より有意に高値を示した。ショベル除雪の強度の平均は6.7 Mets，peak VO<sub>2</sub>の70.7%，Anaerobic Threshold（AT）レベルであった。ダンプ除雪の強度の平均は8.3 Mets，peak VO<sub>2</sub>の89.2%，中高年者群ではATレベルを越えていた。除雪作業中の拡張期血圧は，中高年者群の方が若年者群より有意な上昇が認められ，ダンプ除雪で顕著であった。中高年者群の除雪の強度はATレベルより大きく，特にダンプ除雪では血圧の上昇に注意が必要であった。
The purposes of this study were to assess the working conditions and cardiorespiratory responses during snow removal. The subjects consisted of 12 young healthy volunteers (mean age, 20.5 ± 1.0 years) and 11 middle-aged volunteers (mean age, 49.2 ± 7.8 years). They performed shovel snow removal (with an ordinary-size shovel) and dump snow removal (with a large-size shovel) for 5 minutes each at their own pace. The working conditions and cardiorespiratory responses were compared between the young and middle-aged groups. The frequency of snow shoveling was significantly higher in the young group than in the middle-aged group. The oxygen intake had a positive correlation with the weight of snow shoveled at one time for shovel snow removal, and it had a positive correlation with the frequency of snow shoveling for dump snow removal. The exercise intensity of shovel or dump snow removal did not significantly differ between the young and middle-aged groups. However, the relative exercise intensity was significantly higher for the middle-aged group than for the young group. The mean exercise intensity of shovel snow removal was 6.7 Mets and the percent peak VO<sub>2</sub> was 70.7%, being at the Anaerobic Threshold (AT) level. The mean exercise intensity of dump snow removal was 8.3 Mets. The percent peak VO<sub>2</sub> was 89.2% and was higher than the AT level for the middle-aged group. The distolic blood pressure during snow removal was significantly higher for the middle-aged group than for the young group, which was more remarkable in the dump snow removal. The exercise intensity of snow removal in the middle aged was higher than that of the AT level, and it is necessary to note the blood pressure increased for dump snow removal.
- Physical Therapy Japan
Physical Therapy Japan 30(5), 273-279, 2003
Japanese Society of Physical Therapy