ECOLOGICAL STUDY OF AEROBIC WORK CAPACITY IN URBAN AND RURAL ADOLESCENTS
- VernacularTitle:生態学的にみた都市と農村青少年の有酸素的作業能に関する研究
- Author:
SHIGEHIRO YOSHIZAWA
- Publication Type:Journal Article
- From:Japanese Journal of Physical Fitness and Sports Medicine
1971;20(3):125-133
- CountryJapan
- Language:Japanese
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Abstract:
The results of Sport Test in TOCHIGI Prefecture in 1964 and 1968 showed the definite and consistent inclination that rural pupils recorded significantly better performance than urban ones in endurance run. This also implies that circulorespiratory capacity, which plays an important role in endurance type of exercise, is much influenced by the environmental conditions necessarily accompanied with each district.
In the present study PWC170 kpm/kg as an index of circulorespiratory capacity were measured by means of MONARK bicycle ergometer and ECG in the two couples of urban and rural groups of pupils aged from 12 to 15 years, and the comparisons of urban and rural indicated that rural pupils had considerably better than urban ones with significant difference.
In one couple of the two the pupils of the school surrounded with commercial streets and the ones in mountaneous farm village were contrasted in order to design the ecological research, because the latter was the best and the former the worst in endurance run
85.6% of the pupils in the mountaineous farm village go to school far from home by pedaling bicycle ascending or descending the slopes, and on the other hand all the pupils in the commercial streets walk to school along the horizontal and flat streets nearer than in the mountaineous farm village
In Japan an amount of intraschool physical activities are almost the same in all schools and therefore the differences of daily physical activities, the degree of which brings about the circulorespiratory improvement, depend on the work of attending school long through the years.
In this study the extent of the work load in attending school was estimated by heart rate-oxygen uptake curve on the basis of the mean heart rate derived from telemetering heart beats all through the courses between school and home. This procedure reveals the evidence that mountaineous farm pupils by bicycle are given the work load equivalent to 40% or more of the maximal oxygen uptake, which means the stroke volume reaches its peak and becomes the adequate training stimulus for circulorespiratory improvement, but for the pupils in commercial streets vice versa. And furthermore it was also found that the farther from school, the better the circulo-respiratory capacity in the mountaineous farm district
Though there was found to be the significant difference between them in PWC170 as submaximal test, no significant difference was indicated in maximal oxygen uptake (ml/kg, STPD) . This may be due to the fact that in pedaling in step wise method of increasing brake resistance distress or fatigue in leg muscles proceeds the circulorespiratory one.
