Does vastus lateralis muscle oxygenation affect left ventricular twist during exercise
Cardiff Metropolitan University
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LV twist and skeletal muscle oxygen saturations are known to change immediately with the onset of exercise. Previous literature has suggested that LV twist increases and muscle oxygenation decreases with exercise compared to resting values. However, it is not yet known if these two physiological parameters are related during sub-maximal exercise. Using a hypoxic stimulus has been a popular method for gaining exaggerated results for both these parameters. It has been suggested that hypoxia induces significant increases in LV twist during sub-maximal exercise in both trained and untrained individuals. Similar decreases have been found in muscle oxygenation values for sub-maximal exercise. During this study 15 males (mean age: 22.0 ± 3.6 years) from mixed sporting and training backgrounds were assessed for relationships between LV twist and vastus lateralis muscle oxygen saturations during supine sub-maximal exercise (40% PPO) at both normoic and hypoxic conditions. It was hypothesised that there would be significant relationships between LV twist and skeletal muscle oxygen saturation during normoxic sub-maximal exercise, and this relationship would be exaggerated during hypoxic exercise at the same relative exercise intensity. During normoxic and hypoxic exercise conditions, no significant relationships were found between LV twist and muscle oxygenation (normoxia, r = 0.07674; hypoxia, r = 0.04526). Following additional examination of the data, it was found that there were two outlaying data points. These two individuals with these responses happened to be the only two that were highlytrained endurance athletes. Further analysis excluding these individuals revealed that there was a strong positive relationship between LV twist and skeletal muscle oxygenation during normoxic sub-maximal exercise (r = 0.7078). This result suggests that this relationships between LV twist and muscle oxygenation may be influenced by individuals’ exercise training status. There was no significant relationship to be found between these parameters during hypoxic sub-maximal exercise for the recreational athlete sample (r = 0.09865). In conclusion, LV twist and skeletal muscle oxygen are strongly related in recreationally trained athletes during normoxic sub-maximal exercise. Results from this study should influence the practice of both applied sports physiologists as well as medical clinicians in the way they interpret muscle oxygenation values during their work and in how they monitor iii and use sub-maximal exercise as a therapeutic therapy in both injured and diseased individuals. Further research, should focus on what causes this relationship at submaximal exercise at normoxia and whether highly-trained endurance athletes have a similar but shifted relationship.
DEGREE OF BACHELOR OF SCIENCE (HONOURS) SPORT AND EXERCISE SCIENCE
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