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ERIC Number: EJ1189190
Record Type: Journal
Publication Date: 2018
Pages: 13
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0270-1367
EISSN: N/A
Moderate-Intensity Oxygen Uptake Kinetics: Is a Mono-Exponential Function Always Appropriate to Model the Response?
Dale, Julian; Glaister, Mark
Research Quarterly for Exercise and Sport, v89 n3 p309-321 2018
Purpose: This study investigated the existence of the oxygen uptake (VO[subscript 2]) overshoot and the effects of exercise intensity and fitness status on the response during moderate-intensity exercise. Methods: Twelve "high-fitness" (M[subscript age] = 26 ± 5 years; M[subscript height] = 184.1 ± 5.4 cm; M[subscript body mass] = 76.6 ± 8.9 kg; mean peak oxygen uptake (VO[subscript 2]peak) = 59.0 ± 3.3 mL·kg[superscript -1]·min·[superscript -1]) and 11 "moderate-fitness" (M[subscript age] = 29 ± 5 years; M[subscript height] = 178.7 ± 7.5 cm; M[subscript body mass] = 81.7 ± 10.9 kg; MV?O[subscript 2]peak = 45.2 ± 3.1 mL·kg[superscript -1]·min·[superscript -1]) participants performed square-wave transitions from unloaded cycling to 3 different intensities (70%, 82.5%, and 95% of the gas exchange threshold). The data were modeled using both a mono-exponential function (Model 1) and a function that included a switch-on component (Model 2). The overshoot was computed by subtracting the steady state from the peak of the modeled response and by calculating the area of the curve that was above steady state. Results: The goodness of fit was affected by model type (p = 0.002) and exercise intensity (p < 0.001). High-fitness participants displayed a smaller t (p < 0.05) and a larger amplitude (p < 0.05) and were more likely to overshoot the steady state (p = 0.035). However, while exercise intensity did affect the amplitude (p < 0.001), it did not affect t (p = 0.05) or the likelihood of an overshoot occurring (p = 0.389). Conclusion: While exercise intensity did not alter the VO[subscript 2] response, fitness status affected t and the likelihood of an overshoot occurring. The overshoot questions the traditional approach to modeling moderate-intensity VO[subscript 2] data.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Grant or Contract Numbers: N/A