engleski

Validity of the 30-15 intermittent fitness test for measuring maximal oxygen uptake in physically active individuals

The goal of the study was to assess criterion- related validity of 30-15IFT in physically active individuals. Eighteen active physical education students (7 females and 11 males, age: 22.4 ± 0.9 years, height: 175.8 ± 9.3 cm, weight: 73.4 ± 13.2 kg) volunteered to participate in the study. The participants performed the 30-15IFT and maximal incremental exercise test in the laboratory on two different occasions separated by at least 72 hours and not more than 7 days. The association between directly measured VO2max and estimated VO2max was analyzed with Pearson correlation coefficient. Bland-Altman plots were used for illustration of intra-individual agreement while one-way analysis of variance (ANOVA) was used to determine the difference between the outcome measures. Regression analysis was used for calculation of the standard error of the estimate. There was a large significant correlation between the measures (r = 0.77) with a standard error of the estimate of 3.9 ml/kg/min. The estimated VO2max (47.9 ± 4.1 ml/kg/min) was significantly lower (p<.001) than directly measured one (52.4 ± 6 ml/kg/min) with large (.6) effect size. The 95% LoA were in range from -12 to 2.9 ml/kg/min with mean difference of -4.5 ± 3.8 ml/kg/min. The results suggest that 30-15IFT cannot be used as a valid test to assess VO2max, at least in physically active individuals.

aerobic endurance ; field test ; maximal incremental exercise test

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