Erythrocyte Oxidative Stress, Salivary Cortisol, and Oxygen Consumption with Low-Intensity Blood Flow Restricted Resistance Exercise Before and After Training.
Erythrocyte Oxidative Stress, Salivary Cortisol, and Oxygen Consumption with Low-Intensity Blood Flow Restricted Resistance Exercise Before and After Training.
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2017-12
Authors
Kocher, Morgan H.
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This study compared oxidative stress in erythrocytes, salivary cortisol, and excessive post-exercise oxygen consumption (EPOC) during traditional high-intensity back squats and low-intensity back squats with blood flow restriction (BFR) as well as the effects of two weeks of training on these markers. Nineteen trained and untrained males participated in the study and 16 (8 trained) completed the two-week training program. When comparing Low-Intensity with BFR to Traditional High-Intensity, plasma lactate values were significantly increased immediately after exercise compared to all other timepoints (p<.013), the V(C=O) bond significantly decreased in untrained individuals at the 30 minute and 24 hours post exercise timepoints, and the immediate post-exercise timepoint was significantly increased in Untrained individuals with low-intensity exercise with BFR and the 24 hours post exercise timepoint was significantly increased in Trained individuals with low-intensity exercise with BFR. There were significant increases in salivary cortisol with low-intensity back squats with BFR 30 minutes post-exercise before training (p<0.05), but not with high-intensity back squats or with low-intensity back squats with BFR after training. When comparing acute changes before and after two weeks of low-intensity exercise with BFR, plasma total spectral area decreased at 30 minutes post-exercise (p=0.004), and plasma lactate immediately after exercise was significantly higher than 30 minutes post exercise (p=0.022) and 24 hours post exercise (p=0.005). The V(C=H):Vas(CH3) ratio increased with training in Untrained individuals, but decreased in trained individuals and the V(C=O) bond was significantly reduced at 30 minutes post-exercise compared to 24 hours post exercise. There were no significant differences between conditions or with training in EPOC magnitude or duration, but both of these measures were significantly different between trained and untrained individuals (p<0.05). Additionally, two weeks of training significantly increased three-repetition maximum strength in both trained and untrained participants, although untrained participants increased significantly more than trained participants.
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