Abstract
Current methods to assess critical speed (CS) are limited by the need for subjects to perform a set number of time-to-exhaustion trials at a constant speed on a treadmill or through several maximal runs on separate days on a running track. PURPOSE: To assess the reliability and validity of a 10-minute submaximal treadmill test of critical speed (CS). METHODS: Twenty-nine recreational road runners (21 men, 8 women; age: 31.8 ± 5.7 years; VO2max: 52.5 ± 6.9 ml.kg-1.min-1) completed a familiarization trial consisted of running 10 minutes (T10) at a vigorous self-selected speed plus two experimental trials (T10-test and T10-retest). Speed from the T10-test and T10-retest were assessed using coefficient of variation (CV), limits of agreement (LoA) and intraclass correlation (ICC). Next the CS assessed from an additional T10-test was compared with the CS assessed through Field tests. The Field tests consisted of 3 runs on separate days on a running track over 1200, 2400 and 3600 m. RESULTS: Reliability analysis between the T10-test and T10-retest showed a CV of 3.2% (95% CI: 2.5-4.3%), LoA of ± .32 m.s-1, and an ICC of .94 (95% CI: .87, .97). Validity data showed that speed (m.s-1) (T10-test: 3.79 ± .47; Field-test: 3.80 ± .49) did not differ between trials (p = 1). Also, the T10-test was highly correlated with the Field-test (r = .90, p < .001) and presented a CV of 4% (95% CI: 3.2-5.4%) and LoA of ± .41 m.s-1. CONCLUSION: The submaximal 10-minute treadmill test (T10) yields reliable and valid estimates of CS providing a useful alternative for assessing CS on a treadmill.
Published Version
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