Author + information
To evaluate the 6-minute walking distance (6MWD) for healthy Chinese adults of convenient sample aged 20-30 years.
Thirty six healthy subjects aged 20-30 years were recruited in Guangzhou from December 17th, 2016 to February 26th, 2017. After consent, each subject performed the 6MWT twice in two different days, resting at least for 24 hours before testing again. All the practices were followed the guidelines for the six-minute walk test published in 2002. The location was a semi indoor space with few people travelled. Before the test, subject was required to fill out a questionnaire about their basic information, including age, gender, height, weight, occupation, education background, physical activity, regular exercise and medical history. Then, the subject performed the test on a flat 30-m straight walkway. During the test, oxygen saturation(SPO2), heart rate(HR), systolic blood pressure(SBP), diastolic blood pressure(DBP), dyspnea and leg fatigue were all monitored to prevent adverse effect. All data were computed with SPSS windows 20.0.
Thirty six healthy adults (13 males; average age: 21.28±1.95 years, average height: 1.64 ± 0.84m; average weight: 55.83 ± 7.65 kg; average BMI: 20.67 ± 1.66 kg/m2) were included. The mean 6MWD was 630.00 ± 57.15m (range 525.50 - 763.70m). Six- minute walking distance in males was significantly higher than that in females (668.31 ± 49.28m vs. 608.35 ± 50.15m, p = 0.001). Subjects whose height was higher than 1.70m walked a longer 6MWD than those whose height was lower than 1.70m (665.70 ± 43.21 vs. 616.27 ± 56.52, p = 0.018). The significant differences were found in the relationship between 6MWD and gender (r = -0.47, p = 0.004), as well as height (r = 0.332, p = 0.048). Other parameters, however, showed no statistically significant difference. For activity level and regular exercise, though currently, there were no significant difference, subjects with high activity level walked slightly longer than those with low or moderate level and those insisting regular exercise also had longer 6MWD than that with no regular exercise.
The gender and height do exert influence on the 6MWD, which demonstrates the importance of considering the sex and height when predicting 6MWD in young healthy adults.