Date of Award

Spring 5-3-2024

Document Type

Thesis

Degree Name

Bachelor of Science (BS)

Department

Kinesiology

College

College of Health and Human Performance

First Advisor

Timothy R. Rotarius

Abstract/Description

This study examined the physiological responses to continuous, heavy-intensity (CONT), intermittent, heavy-intensity (INT), and intermittent, heavy-intensity cycling with limb occlusion (INT-LO). METHODS: Five young (23.2 ± 5.5 yrs.), healthy subjects participated in this study and completed a total of seven visits. Three conditions were completed by each subject: CONT, INT, and INT-LO. Each condition consisted of a 4-minute warm-up (20 W), 6 minutes of exercise, followed by 5 minutes of recovery cycling. For CONT, exercise was performed at Δ50% for the entire 6 minutes. INT and INT-LO alternated between 15 seconds of work at Δ50%, and then 3 seconds of recovery cycling (20 W). During the INT-LO condition, during the three seconds of rest, blood flow was occluded to the lower extremities. Oxygen uptake kinetics, sEMG, and pleasantness of exercise were all assessed during each condition. RESULTS: The amplitude of the V̇O2 slow component (A3’) was significantly lower in INT (219 ± 39 mL/min) and INT-LO (286 ± 45 mL/min) compared to CONT (391 ± 116 mL/min, p < 0.05). End-exercise V̇CO2, V̇E, and HR were all greatest in CONT (p < 0.05). There were no significant differences in sEMG between conditions. Pleasantness of exercise was lower in the 6th minute of exercise in the INT-LO condition (-0.3 ± 3.1) and CONT (0.3 ± 2.2) compared to INT (1.6 ± 1.6). CONCLUSION: The addition of limb occlusion to heavy-intensity, intermittent cycling does not significantly alter the overall V̇O2 response and the appearance of the V̇O2SC compared to INT and CONT.

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