Validity and reliability analysis of Cooper's 12-minute run and the multistage shuttle run in healthy adults Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cn69m665q

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  • Field tests are often the most practical method to assess aerobic fitness, but demonstrate greater error variability than laboratory tests. Researchers can improve field tests by identifying factors that contribute to systematic error in VO₂max estimation. PURPOSE: To examine the validity and reliability evidence of two field tests of aerobic fitness: Cooper's 12-minute run (12MR) and the multistage shuttle run (MSR). METHODS: Sixty participants (mean age = 21.8 ± 3.6y), completed three trials (occasion) of each field test (instrument) for a total of six test trials. To estimate overall reliability and evaluate possible sources of error in the field tests, a psychometric statistical tool called generalizability study (G-study) was employed. This analysis utilized a two-random facet design (occasion and instrument) in a completely crossed ANOVA. In addition, criterion VO₂max was assessed in a subgroup of volunteers (n = 21) via an incremental treadmill run and expired gas analysis (TR). Each participant completed the study within a six-week period. RESULTS: G-study analysis of the two field tests returned a high reliability coefficient (φ = 0.96), with the largest amount of systematic error variance (4.3%) attributable to an interaction between participants and test occasions. This mild interaction suggests certain test participants demonstrated larger error variability across test occasions than other participants. The MSR predicted VO₂max values lower than those measured in the laboratory setting (p < 0.01; paired t-tests), while 12MR and TR scores were not different (p > 0.05). The 12MR underestimated VO₂max values at lower aerobic fitness levels and overestimated VO₂max values in individuals demonstrating greater aerobic fitness, which was not observed in the MSR data. CONCLUSIONS: These results suggest high reliability for VO₂max field tests in young, healthy individuals. However, test administrators must use caution when attempting to use field test data to predict criterion VO₂max scores. While test participants can be expected to attain MSR scores significantly lower than the criterion value, the consistent mean bias across VO₂max values makes the MSR a more useful test when comparing test participants.
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