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- W2092194946 abstract "PURPOSE: The purpose of this study was to examine the relationship between changes in total mechanical energy (ME) and oxygen consumption during treadmill running in the severe intensity domain. METHODS: Seven subjects (3 males, 4 females) volunteered for this study (mean age ±SD = 25.4 ± 2.5 yrs; mass = 66.6 ±7.0 kg). After a separate familiarization session, subjects performed an incremental treadmill test to exhaustion (1% grade, speed increment = 0.5 mph per minute) from which the ventilatory threshold, respiratory compensation threshold, and peak VO2 were determined. On a subsequent day, subjects performed a constant speed treadmill run at a speed above the respiratory compensation threshold but below the speed at VO2 peak. During this run, gas exchange data was continuously recorded. In addition, 3-D kinematic data was captured over a 10 second epoch every 30 seconds using an 8-camera Motion Analysis system at 120 Hz. The total ME was calculated using the no transfer approach for a 13 segment anthropometric model. The total ME was calculated for each epoch was normalized to J/kg/m. After removing the first minute of the run data, both VO2 and ME were regressed against time within each subject. The slopes of the individual regressions were analyzed by constructing 95% confidence intervals around the mean slopes. In addition, the correlation between the VO2 and ME slopes was calculated. RESULTS: The mean ME slope was .0093 + 0.04 J/kg/m per min (95% CI = −0.26 − 0.045) and the mean VO2 slope was 74.3 + 94.8 mlO2 per min (95% CI = −13.4 - 161.9). The correlation between the ME and VO2 slopes was negative (r=−0.75, p =0.03), although was likely driven by the leverage associated with one subject with both the largest VO2 slope and the most negative ME slope. CONCLUSIONS: The results do not support the hypothesis that increases in oxygen consumption during severe intensity running at a constant speed are driven by changes in total mechanical energy." @default.
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- W2092194946 date "2008-05-01" @default.
- W2092194946 modified "2023-09-27" @default.
- W2092194946 title "Dissociation Between Oxygen Uptake Drift During Severe Exercise And Changes In Running Mechanics" @default.
- W2092194946 doi "https://doi.org/10.1249/01.mss.0000321954.22249.d4" @default.
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