Thesis
Muscle oxygenation during graded exercise in trained rowers
Masters by Research, Murdoch University
2022
Abstract
Purpose: The objectives of this investigation were 1) determine whether muscle oxygenation provided a better predictor of rowing performance than maximal oxygen uptake (V̇O2max), and 2) assess differences in muscle oxygenation between sites during graded rowing exercise. Methods: Trained male (n=16) and female (n=6) rowers completed a 7x4 min graded exercise test on a rowing ergometer to determine V̇O2peak and performance (W/kg during the final stage). Minimum muscle oxygen saturation (SmO2min) during the test and change in oxygen extraction during each stage (Δ[HHb]) were determined using near infrared spectroscopy (NIRS) monitors at four sites on the body (vastus lateralis [VL], gastrocnemius medialis [GM], biceps brachii [BB], and latissimus dorsi [LD]). Results: V̇O2peak displayed the strongest correlation with performance (r=0.869, 95% CI [0.707, 0.945], p<0.001). SmO2min at VL was strongly correlated to both V̇O2peak and performance (r=-0.769 [-0.919, -0.423], p<0.001; r=-0.744 [-0.910, -0.375], p=0.001, respectively), with SmO2min at BB also significantly correlated to performance (r=-0.437 [-0.731, -0.006], p=0.048). Multiple regression analysis revealed that V̇O2peak and GM Δ[HHb] accounted for 83% of the variance in performance. The inclusion of VL Δ[HHb] into the model did not improve its predictive power. There was a significant site x stage interaction for Δ[HHb] (p<0.001, ηp2=0.110), with significant differences observed between BB and GM for all stages (p<0.016, ds >0.9). A significant difference was found between BB and VL during the maximal stage only (p=0.031, ds=-1.08), and between GM and VL during the 5th and 6th stages, (p=0.003, ds=-1.08; p<0.001, ds=-1.34, respectively). Conclusion: V̇O2peak provides a better predictor of rowing ergometer performance than muscle oxygenation in trained rowers. Site-specific muscle oxygenation varies with exercise intensity, so the use of NIRS may provide additional useful information regarding the relative contributions of different muscle groups to varying exercise intensities.
Details
- Title
- Muscle oxygenation during graded exercise in trained rowers
- Authors/Creators
- Bryce J Lanigan
- Contributors
- Paul Goods (Supervisor) - Murdoch University, Centre for Healthy AgeingBrendan Scott (Supervisor) - Murdoch University, Centre for Healthy AgeingJeremiah Peiffer (Supervisor) - Murdoch University, Centre for Healthy Ageing
- Awarding Institution
- Murdoch University; Masters by Research
- Identifiers
- 991005548666507891
- Murdoch Affiliation
- College of Science, Health, Engineering and Education
- Resource Type
- Thesis
- Note
- Accelerated Research Masters with Training of Murdoch University
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