Estimation of cardiorespiratory endurance in young adult men using 12-min submaximal treadmill walk/run test / 体力科学

ABSTRACT

The purpose of this study was to clarify the validity of 12-min submaximal treadmill walk (TMW) and run (TMR) tests, as indirect measures of cardiorespiratory endurance, and to develop estimation equations of cardiorespiratory endurance using TMW or TMR performance and some other useful items correlating with cardiorespiratory endurance. Fifty-one young adult men, aged 20 -r34 years (22.8±3.6), walked or ran for 12 minutes on the treadmill at the intensity corresponding to the level 13 on the Borg's ratings of perceived exertion (RPE 13), and performed a maximal incremental exercise test. Mean (± SD) of oxygen uptake corresponding to anaerobic threshold (VO<SUB>2</SUB>AT) and maximal oxygen uptake (VO<SUB>2</SUB>max) were 42.0 ± 9.0 ml/kg/min and 55.9 ± 7.4 ml/kg/min, respectively, and mean (± SD) of 12-min walk and run distances were 1221 ± 103 m and 2108 ± 269 m, respectively. Cardiorespiratory endurance indices (VO<SUB>2AT</SUB> and VO<SUB>2</SUB>max) significantly correlated with TMW (r=0.49 and 0.48, respectively) and with TMR (r=0.69 and 0.68, respectively) . A stepwise multiple regression analysis was applied to determine the estimation equations of the cardiorespiratory endurance using VO<SUB>2AT</SUB> or VO<SUB>2</SUB>max as a dependent variable, and TMW or TMR distance, age, resting heart rate (HRrest), and exercise frequency in a week as independent variables. The multiple regression equations of VO<SUB>2AT</SUB> and VO<SUB>2</SUB>max were developed as follows When TMW distance entered as an independent variable, VO<SUB>2AT</SUB> = 20.781 X<SUB>1</SUB> + 2.298 X<SUB>3</SUB> - 0.29 X<SUB>4</SUB> + 31.855 (r = 0.83, SEE = 5.33 ml/kg/min) VO<SUB>2</SUB>max =19.941 X<SUB>1</SUB> + 1.127 X<SUB>3</SUB> - 0.208 X<SUB>4</SUB> - 0.656 X<SUB>5</SUB> - 0.853 X<SUB>6</SUB> + 77.884 (r = 0.88, SEE = 3.96 ml/kg/min), and when TMR distance entered as an independent variable, VO<SUB>2</SUB>AT =15.443 X<SUB>2</SUB> + 2.158 X<SUB>3</SUB>- 0.157 X<SUB>4</SUB> + 14.234 (r = 0.90, SEE = 4.18 ml/kg/min) ; VO<SUB>2</SUB>max =10.817 X<SUB>2</SUB> + 1.274 X<SUB>3</SUB> - 0.1946 X4 - 0.504 X<SUB>5</SUB> + 55.234 (r = 0.89, SEE = 3.79 ml/kg/min), where X<SUB>1</SUB> TMW distance (m), X<SUB>2</SUB> TMR distance (m), X<SUB>3</SUB> exercise frequency in a week (d/wk), X<SUB>4</SUB> HRrest (b/min), X<SUB>5</SUB> age (yr) and X<SUB>6</SUB> BMI. It is concluded that cardiorespiratory endurance could be better estimated by a combination of submaximal exercise performance and some easily measurable items correlating with cardiorespiratory endurance such as exercise frequency, circulatory function, chronological age and body composition.