The integration of neuromuscular, perceptual, and cardiorespiratory fatigue responses is modulated by high intensity interval training characteristics and blood flow restriction in males and females
Date
2022-08-17
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Abstract
High intensity interval training (HIIT) consists of a series of work intervals interspersed by recovery phases. This popular exercise paradigm has been hypothesized to mitigate metabolic by-product accumulation and to result in a disconnect between the work completed and the neuromuscular, perceptual, and cardiovascular responses to exercises performed in the severe domain. The HIIT characteristics such as the duration of work and recovery phases may modulate metabolic perturbations and influence psychophysiological responses determining exercise performance. One technique used in conjunction with HIIT is blood flow restriction (BFR). It is currently unknown how the durations of HIIT work and recovery phases, and the superimposition of BFR influence the integration of neuromuscular, perceptual, and cardiorespiratory responses determining exercise tolerance. Additionally, it is unknown how modulating HIIT work and recovery durations influences subsequent neuromuscular recovery kinetics. This thesis includes two studies. The objective of the first study was to compare the psychophysiological responses determining exercise tolerance during shorter HIIT, longer HIIT, and constant load (CL) protocols. The objective of the second study was to compare the integration of neuromuscular, perceptual, and cardiorespiratory indices of exercise tolerance during 1:1 min work-to-passive rest ratio HIIT with and without the application of BFR in males and females. The first investigation illustrated that shorter HIIT resulted in a greater task duration and reduced psychophysiological stress at a work-matched timepoint, while no differences were demonstrated at task failure. Additionally, this study demonstrated that after task failure, compared to the HIIT protocols, CL led to the most rapid recovery of neuromuscular fatigue. The second study illustrated that the application of BFR during HIIT rest intervals reduced exercise duration and exacerbated the rate of neuromuscular, perceptual, and cardiorespiratory responses in comparison to non-occluded HIIT. Additionally, BFR resulted in a greater rate of fatigability compared to control in females than males. Collectively, the findings demonstrate that longer HIIT work periods and the application of BFR reduce exercise capacity, which can be attributed to modulated psychophysiological alterations. Overall, these results have important implications to further our understanding of the physiological adaptations to HIIT and exercise prescription methods.
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Keywords
Neuromuscular fatigue, High intensity interval training, Blood flow restriction, cardiorespiratory, perceptual fatigability, recovery
Citation
McClean, Z. J. (2022). The integration of neuromuscular, perceptual, and cardiorespiratory fatigue responses is modulated by high intensity interval training characteristics and blood flow restriction in males and females (Master thesis). University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca .