The purpose of this study was to examine the effects of warm-up intensity on total oxygen uptake and VO2 kinetics (time constants) during submaximal exercise in the Iranian national female futsall player’s. The participants of this study were ten Players of Iranian futsal national team (mean±SD: age, 22.5±3.2yrs; weight, 56.04±6.17kg; height, 163±3.68cm; body fat%, 23.5±3.8; BMI, 21.07±2.22kg/m2; VO2max, 46.05±4.61 ml.kg-1.min-1). After measuring of VO2max and LT in first session, the subjects performed two protocols of warm up (moderate and heavy intensity) and one protocol with-out warm up before sub maximal exercise (80%LT) in three separated sessions. Respiratory gas exchange measured by Gas Analyzer during the exercise. Repeated measures ANOVA and LSD test were applied for statistical analysis. Total oxygen uptakes were not significant difference after three conditions. After moderate and heavy warm up, third time constants significantly reduced in compare to without warm-up (p<0/05). Also oxygen uptake/time ratio in third time constants significantly increased after moderate and heavy warm up respect to without warm-up (p<0/05). The results suggest that warm up causes reducing the time of reaching to steady state of O2 uptake in sub maximal exercise and this effect is independent to warm up intensity.
