Master of Science (MS)
Abstract Oxygen consumption during exercise is typically used to advance performance, determine fitness level, and make clinical diagnoses. The rate at which VO2 adjusts to and recovers from (i.e. on- and off- kinetics) a bout of exercise is typically associated with certain metabolic processes such as stores of PCr, ATP, replenishing myoglobin, hemoglobin, and removing metabolic waste. The ability of an individual to utilize these processes can determine the speed at which oxygen consumption rises and falls, and thus is associated with the health of the individual (i.e. faster=fitter; slower=unhealthy). The use of circulatory occlusion training has recently become a well-known training technique that allows individuals who cannot exercise at a high intensity to gain physiological adaptations through exercise at a low intensity. The current study used venous occlusion in an acute bout of exercise to determine whether venous function has an effect on oxygen consumption kinetics. Twelve subjects exercised at 60% of VO2 max for 6 minutes on two separate occasions. One condition was considered non-occluded (NON), the other was occluded (OCC); OCC condition consisted of 40mmHg of pressure applied to the legs via pressure cuffs. Subjects’ VO2, heart rate, and RER were recorded during exercise and 6 minutes prior and 6 minutes following exercise. All variables were assessed as area under the curve (AUC) 6 minutes prior (pre), during on transition (on-kinetics), during 6 minutes of exercise (exercise), and 6 minutes following (off-kinetics). No statistically significant differences existed in AUC between conditions for on- (VO2; NON: 6024.97± 1117.56, OCC: 5971.26± 1398.15, HR; NON: 35875± 7713, OCC: 36634± 6379, RER; NON: 246.63± 46.21, OCC: 253.76± 48.78) or off-kinetics (VO2; NON: 5744.40± 1233.59, OCC: 5913.88± 1498.91, HR; NON: 62672± 22, OCC: 63469± 20, RER; NON: 640.0976± 146.53, OCC: 672.0076± 156.33). Furthermore, shortening the time periods analyzed also showed no significant difference for all variables. It is evident that these individuals were able to buffer the accumulation of metabolites that occurs with occlusion during an acute bout.
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Saltzman, Tiffany Noel, "Oxygen consumption during exercise: the role of venous occlusion" (2013). LSU Master's Theses. 2581.