積雪期と無雪期の新聞配達の運動強度

概要

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The purpose of this study is to answer the question whether delivering newspapers is effective to the maintenance of fitness or not. Subjects were five males, 22 to 61 years of age, and three females, 19 to 48 years of age, who delivered newspapers by bicycle for 60 to 80 minutes a day, five or six days per week throughout the year.Each subject performed graded exercise by bicycle ergometer (Monark) in a laboratory to determine mine maximum oxygen uptake and to obtain a regression equation between the heart rate and VO2. Then, the heart rates of daytime were recorded in snowy (February or March) and non-snowy (April) seasons.Seven of the eight subjects satisfied the required level of maximum oxygen uptake for health maintenance which was recommended by Japanese Ministry of Welfare. Mean value of the heart rate during the newspapers delivery in snowy season was significantly higher than that of non-snowy season (112.5±4.2 vs. 105.9±4.3beats·min-1). From a regression equation of heart rate and VO2 in each subject, the exercise intensity during the task were estimated as 21.2±1.7 and 19.0±1.8ml·kg·min-1 (6.1±0.5 and 5.4±0.5 METs), or 50±10 and 45±11 %VO2max in snowy and non-snowy seasons, respectively. Therefore, it was concluded that the delivering newspapers, particularly in snowy season, was effective to the maintenance of fitness.