Plasma volume adaptations to high versus moderate intensity exercise interventions in sedentary individuals
Student Showcase of Excellence 2017
The purpose of the study was to determine how an aerobic moderate intensity (AE/mod) versus an anaerobic high intensity interval training (AnE/HIIT) intervention affected plasma volume and VO2max in sedentary individuals. METHODS: Subjects were 11 sedentary males and females (21 ± 1.3 yr) who were randomly divided into two groups. The AE/mod group consisted of five subjects and the AnE/HITT group consisted of six subjects. Each subject attended a pre- and post-intervention session where a VO2peak test was completed on a cycle ergometer and resting blood samples were collected via capillary puncture for plasma volume analysis. Between testing, the subjects completed a three week exercise intervention on stationary cycle ergometers. During each session, the AE/mod group cycled for 20 min at 60-70% of W at VO2peak. The AnE/HIIT group completed intervals of 30 s at 80-90% of W at VO2peak with rest periods of 120 s at 35-45% of W at VO2peak. Both groups had a total work time of 30 min which included a 5 min warm up and cool down at 40-50% of W at VO2peak. RESULTS: No significant differences were found between the pre- and post-testing in plasma volume or VO2peak for the AE/mod or AnE/HIIT group. CONCLUSION: The researchers suggest that a reason no significant differences were found was due to the length of the intervention. The study could set a foundation for future researchers to examine how plasma volume and VO2peak are affected by different exercise interventions in sedentary individuals utilizing a longer intervention.