We assessed the reliability and validity of a 10-min submaximal treadmill test (T10) to predict critical speed (CS). Forty-two runners completed a familiarization trial plus two experimental trials (T10 test and T10 retest). Reliability between the T10 test and T10 retest was assessed using coefficient of variation (CoV), limits of agreement (LoA) and intraclass correlation (ICC). For validity, the speed from the T10 retest was compared with the CS determined from 3 runs on separate days on a running track over 1200, 2400, and 3600 m (field test). Reliability between the T10 test and T10 retest showed a CoV of 3.4%, LoA of 0.05 ± 0.39 m.s −1 , and an ICC of 0.93. Validity showed that speed (m.s −1) (T10 retest: 3.86 ± 0.51; field test: 3.88 ± 0.55) did not differ between trials. The T10 retest was highly correlated with the field test, r = 0.93, and the standard error for the estimate of CS using the T10 retest was 0.06 m.s −1 , and the LoA was 0.02 ± 0.40 m.s −1. A submaximal 10-min treadmill test (T10) provides a practical and accessible method to estimate CS.
To compare the effects of different verbal commands on the perceptual, affective, and physiological responses during running. Methods: Twenty men who regularly performed aerobic exercise and running (mean age: 30.7±10.1 years; mean VO 2max : 55.3 ± 7.1 mL•kg −1 •min −1 ). All subjects completed four exercise sessions: a familiarization trail; three running sessions consisting of a self-selected pace defined by one of the verbal commands: low, moderate, or high. These conditions were counterbalanced. Each running session lasted 20 min. Affective responses (measured by the Feeling Scale and the Felt Arousal Scale) and physiological (measured by the hate rate and treadmill speed) were evaluated during each exercise session. Session RPE (OMNI-RES) was measured 15 min after each exercise session. Results: The perceptual and physiological responses were different for all verbal commands, with the intensity increasing according to the verbal commands given during running (p < 0.01). Affective responses to low and moderate exercise were similar and more pleasant than at high intensities; however, the affective responses to all verbal commands were positive. Conclusion: The results of the present study suggest that verbal commands can be used in running prescriptions. A moderate verbal command can promote greater perceptual and physiological stimuli than a low verbal command, without significant changes in affective responses.
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