최대운동 판단 기준으로서 호흡교환율, 혈중젖산농도, 자각인지도의 성차 = Gender Differences in the Respiratory Exchange Ratio, Concentration of Blood Lactate and Ratings of Perceived Exertion as Criterion for Verification of Maximal Exercise

다국어 초록 (Multilingual Abstract)

The purpose of this study was to test the validity of determination of the level of respiratory exchange ratio(RER), concentration of blood lactate(CBL) and Ratings of Perceived Exertion(RPE) as criterion for verification of maximal exercise. The sub jects were 11 college males and 11 college females who were healthy and voluntarily participated in maximal treadmill exercise by Bruce protocol. Cardio-respiratory variables were continuously measured every 20 sec by metabolic analyser(Vmax229, Sensor Medics, U.S.A) from resting level before exercise to the post exercise of 5 min. Concentrations of lactate in the blood sampled by finger tips were tested by lactate analyzer(YSI 1500, U.S.A) in every last 20 sec of 3 min exercise stages, immediately after maximal exercise, and at each 3 and 5 min in the post maximal exercise with RPE being requested to answer at the same time. The main criterion of maximal exercise adopted in this study was to find a plateau in heart rate and oxygen uptake with increased workload for at least 20-50 sec breath by breath. Findings of this study were as follows.
First, there was non-significant sex difference in RER in the maximal exercise and in the recovery period of 5 min between male and female groups. Mean RER in the maximal exercise were 1.14 (males: 1.11±0.07 / females: 1.17±0.06).
Second, although there was non-significant sex difference in CBL immediately after the maximal exercise between male(7.99±1.78 mM/L) and female(7.20±2.62 mM/L) groups, it was founded that there was significant sex difference of CBL in the post exercise of 3 and 5 min after maximal exercise between two groups. And the effect of interaction of groups and blood sampling times from maximal exercise to the recovery period was significant. Although CBL in the post of exercise testing has been observed frequently to verifying maximal exercise performed, it was suggested that CBL was rejected as criterion for verification of maximal exercise in generalization because of sex difference with variation of blood sampling times, etc.
Third, there was also non-significant sex difference of RPE in the maximal exercise and in the recovery period of 5 min between male and female groups. Mean RPE in the maximal exercise were 19(males: 19.00±0.00 / females: 18.73±0.47).
It was concluded that values of RER and RPE were appreciated to find the symptom of maximal exercise.