Cross validation of the 1-mile walking test for men with mental retardation
作者:
RINTALA PAULI,
McCUBBIN JEFFREY,
DOWNS STEVE,
FOX SUSAN,
期刊:
Medicine and Science in Sports and Exercise
(OVID Available online 1997)
卷期:
Volume 29,
issue 1
页码: 133-137
ISSN:0195-9131
年代: 1997
出版商: OVID
关键词: PEAK ˙VO2;GRADED MAXIMAL TREADMILL TEST;ROCKPORT FITNESS WALKING TEST;RELIABILITY;CARDIORESPIRATORY FITNESS
数据来源: OVID
摘要:
The purpose of this study was to cross validate the equation developed by Rintala et al. (1992) to estimate the cardiorespiratory efficiency of men with mental retardation (MR). Subjects were 19 healthy men (27 ± 8 yr) with MR (IQ = 58 ± 12). Following familiarization, a graded maximal treadmill test and two 1-mile walk tests (Rockport Fitness Walking Test, RFWT) were administered. The peak ˙VO2value was the criterion measure used to cross validate the equation. The equation was: Peak ˙VO2(ml·kg-1·min-1) = 101.92 - 2.356 (MILE) - 0.420(WEIGHT). The mean differences were 2.04 (MILE1)(P= 0.02) and 2.43 (MILE2)(P= 0.004) ml·kg-1·min-1. A significant positive correlation was found between measured peak ˙VO2and predicted peak˙VO2on both 1-mile walks (r = 0.91 and 0.93). For both predicted peak ˙VO2values, the Total Error (TE) was greater than standard error of estimate (SEE), indicating a systematic difference between the measured and predicted peak ˙VO2values. Moreover, only 58% of the measured peak ˙VO2values fell within the prespecified range. Testretest reliability of RFWT was R = 0.96. However, the prediction equation underestimated the actual cardiorespiratory levels in 74% and 79% of the subjects, depending on the trial. Because the equation developed in this research underestimates the measured ˙VO2values for the majority of these subjects, the test is probably not statistically valid, even if reliable, and the prediction formula needs to be revised for this population.
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