REFERENCE INTERVAL OF MAXIMAL OXYGEN UPTAKE (VO2max) AS ONE OF THE DETERMINANTS OF HEALTH-RELATED PHYSICAL FITNESS IN JAPAN
- Author:
MASATO SUZUKI
;
IKUO ISHIYAMA
- Publication Type:Journal Article
- Keywords:
health-related physical fitness;
reference interval of VO2max;
iterative truncation method;
receiver operating characteristic (ROC) curve
- From:Japanese Journal of Physical Fitness and Sports Medicine
2010;59(1):75-86
- CountryJapan
- Language:English
-
Abstract:
Maximal oxygen uptake (VO2max) is an important determinant of health-related physical fitness. In 2006, the Japan Ministry of Health, Labour and Welfare (JMHLW) officially declared a standard reference value and reference interval of VO2max. However, these values were established on the basis of a systematic review of reports published in Western countries and were not based on actual VO2max data of the Japanese population. Therefore, we conducted a study entitled “The study on a minimum zone of VO2max as one of the determinants of health-related physical fitness in Japan” from 2004 to 2006 as a project of the Japanese Society of Physical Fitness and Sports Medicine (JSPFSM). In addition, we collected published VO2max data of the Japanese population from the JSPEFM website. In the present study, we attempted to determine the reference interval of VO2max with regard to age, gender, and different methods of exercise. Further, we established a cut-off value of VO2max for determining metabolic syndrome (MS).1. Reference interval of VO2maxFor both men and women, 325 and 364 values for the treadmill exercise, and 1175 and 2178 values for the cycle ergometer exercise, respectively, were collected. This data revealed a balanced distribution of VO2max with regard to age. Data that satisfied the VO2max criterion were used for the analysis. These data were regressed to age on gender and methods of exercise. The percentage of VO2max was calculated using the following equation: %VO2max = measured VO2max × 100/age-estimated VO2max. The iterative truncation method was used to calculate the reference interval of VO2max (70%∼130% VO2max) from the crude data of %VO2max, and then converted to actual VO2max. Thus, the reference interval of VO2max for healthy Japanese was determined with regard to age, gender, and different methods of exercise.2. Cut-off value of VO2max for determining MSUsing the VO2max data of subjects with body mass index (BMI) of ≧25kg/m2 and ≧2 MS risk factors, and the data of subjects with normal BMI without any risk factors, we calculated sensitivity and specificity. The cut-off value was determined using the receiver operating characteristic curve. This cut-off value was defined as the critical value of VO2max that should be maintained to avoid MS and remain healthy.
