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OXYGEN CONSUMPTION OF BENCH STEPPING EXERCISE IN CHINESE CHILDREN

A COMPARISON WITH ACSM EQUATION

Cheung, P Y.1; Hui, S C. FACSM1

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Medicine & Science in Sports & Exercise: May 2002 - Volume 34 - Issue 5 - p S4
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The ACSM metabolic equations are practical tools for fitness professionals to estimate oxygen consumption (VO2) at a given workload. Bench stepping is one of the most widely used exercise modes for submaximal testing of aerobic fitness in a school setting because it requires little space, the test duration is short, and the equipment required is simple. However, the ACSM bench stepping equation for estimating VO2 was orginally developed for Caucasian adults. The purpose of the present study was to compare the measured VO2 of Chinese children during bench stepping exercise, with the estimated VO2 computed using the ACSM bench stepping equation. Twenty-eight Chinese boys and girls (mean age = 8.3 +/− 1.4 yrs) performed three 3-min bouts of bench stepping exercise on a 12 inches (30.5 cm) high bench. The stepping frequencies were 22, 26 and 30 steps/min. The VO2 during each 3-min stepping was measured by a portable metabolic measuring system (COSMED K4b2). The mean +/− SD VO2 was 27.1 +/− 5.3, 29.6 +/− 6.0, and 32.2 +/− 5.5 ml/kg/min for the low-, medium-, and high-frequency stepping exercise, respectively. The estimated VO2 for stepping frequencies was also calculated from the ACSM equation [VO2 = 0.2* (stepping rate) + 2.394* (step height)* (stepping rate) +3.5], and was 24.0, 27.7, and 31.4 ml/kg/min for the low-, medium-, and high-frequency stepping exercise, respectively. One sample t-tests showed that only the measured VO2 of low-frequency stepping exercise was significantly different from the ACSM estimated value (t = 2.967, p < .01), whereas no differences were found between the measured and estimated VO2 for the medium- and high-frequency stepping exercise (p > .05). It is concluded that the ACSM metabolic equation for bench stepping exercise produced acceptable VO2 estimation for medium and high speed stepping for Chinese children. Further investigation is needed to develop an acceptable VO2 prediction equation for low-frequency stepping exercise for Chinese children.

©2002The American College of Sports Medicine