成人女子における総仕事量一定・強度漸増負荷法による長期トレーニングの影響 : 最大酸素摂取量,身体組成,形態及び血液成分にみられるトレーニング効果

Abstract

The purpose of this study was to investigate the effect of intensity upon the aerobic work capacity, body composition, physical characteristics, and boold of women through long-term physical training, when the total amount of work was kept'approximately constant for each subject. Seven sedentary adult females, aged 23 to 40 years, participated in a 44-week tarining experiment. They trained on a bicycle ergometer at 60-65% VO2max during the first 13 (15) weeks (T60), at 75-80% V^^・O_2max during the next 18 (16) weeks (T75) and at 90-95% V^^・O_2max during the final 13 weeks (T90). The total amount of work and frequency were 9000-12000kpm a day, and 2-4 days per week, kept approximately constant for each subject through training, respectively. Mean V^^・O_2 max, expressed in 1/min and per body weight, significantly increased by degrees with two levels up of training intensity, despite keeping constant the total amount of work through the 44-week training. Mean V^^・O_2max per LBM also significantly increased except during, T75. V^^・O_2 max, VE and O_2 pulse, expressed per LBM, showed a significant relationship (partial correlation coefficient keeping the effect of age constant) between their initial values and the total gain (%) after 44 weeks training. The final values of V^^・O_2 max, except an obese subject, after the entire training period attained over the level of +2SD of Japanese active females and were highly correlated with age (p<0.01). On the other hand, the interindividual differences were observed in the response to training intensity in V^^・O_2 max through the 44-week training. That is, two lean subjects improved most of the total gain during T60, another three did more than half of that during T90 and the other one increased by degrees in accordance with the levels up of intensity. Theextremely obese subject could not increase so much. Mean body weight, body fat, and lean body mass did not show any significant change. Mean data of circumferences showed no significant change, whereas some mean data of skin fold thickness (supra iliac, thigh and calf) showed significant decrease following the 44-week training. GOT and GPT of serum enzymes decreased significantly, whereas the other data of blood showed no significant change. Essencially no change occurred in all data for the control group. It was concluded that the increase of intensity without the increase of total amount of work was effective to the improvement of V^^・O_2max, and the susceptibility for intensity was different for each individual. Furthermore, the improvement of V^^・O_2 max with long-term and effective training was significantly related with the initial level based on lean body mass, and the attainable level was significantly limited by age