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Our aim was to develop a 10-min constant-workload walking test for estimation of physical activity in females.
Thirty one healthy female college students (age: 21.4±1.7 years, body height: 165.9±4.5 cm, body weight: 56.8±3.6 kg) were recruited in the present study. A 10-min constant-workload treadmill testing (4.8 km/h, 21% inclination) was applied to evaluate the blood lactate level. During the whole test, the blood lactate concentration, ventilation parameters and the heart rate were recorded.
The main finding of this study was that there was a significant strong linear correlation (r=0.90, p < 0.001) between blood lactate concentration and maximal oxygen uptake after walking on a treadmill for 10 minutes. An equation could be used to estimate maximal oxygen uptake during this treadmill testing based on the blood lactate concentration. Furthermore, there was no significant correlation between maximal heart rate and maximal oxygen uptake (r = 0.22, p > 0.05).
In summary, the 10-min constant workload treadmill test with an equation can be used to estimate VO2max in young females. Our findings warrant future investigation to corroborate that this 10-min constant-workload treadmill walking test could be a potential approach for estimation of physical activity in Chinese females population.