การเปรียบเทียบสมรรถภาพการจับอ๊อกซิเจนสูงสุดก่อนและขณะมีรอบเดือน / ถนอมวงศ์ ทวีบูรณ์ = A comparison of the msximal oxygen uptake capacity before and during menstruation / Thanomwong Taweeboon
The purpose of this study was to compare the maximal oxygen uptake capacity before and during menstruation. Subjects were 37 healthy girl students in the first and second year of Burirum teacher college, with the average age of 18.16 years, height 153.55 centimetres, and weight 50.93 kilograms. Subjects’ menstrual histories were observed for 2 months and no sign of dysmenorrhea. Prior to the experiment, each subject had to undertake preliminary test to find out the suitable work load by pedaling the Monark bicycle ergometer. Preliminary test began with average of 1.5 kilopounds work load, and then 0.5 kilopounds work load were added for every 2 minutes until a suitable work load was established when subject’s heart rate reached 130-150 beats per minute. Each subject pedaled the bicycle ergometer twice. First, in the second day of the menstruation, and second, in the fourteenth after the first day of having it. The experiment started at least 3 hours after the jast meal. Prior to the experiment, the subjects were weighed and seated for 10 minutes before the temperatures (mouth), blood pressure and heart rate were obtained. The subjects pedaled the bicycle ergometer by using the suitable work load with 50 cycles per minute for 6 minutes. The heart rate was counted each minute till it reached a steady state at the fifth or sixth minute. The maximal oxygen uptake capacity was recorded according to astrand’s method. Data were analyzed by t-test. Results indicated that : 1. There was no significant difference in the maximal oxygen uptake capacity before and during menstruation. (p>.05) 2. There was no significant difference in heart rate at the steady state before and during menstruation. (>.05) 3. There was no significant difference in body condition, such as weight, body temperature and blood pressure before and during menstruation. (p>.05) 4. There was no significant difference in heart rate before exercise, during exercise and recovery before and during menstruation. (p>.05)