Honors Theses and Capstones

Date Completed

Spring 2023

Abstract

Low-intensity (LI) aerobic exercise with blood-flow restriction (BFR) increases heart rate (HR), oxygen consumption (VO2), and ratings of perceived exertion (RPE), sometimes to similar levels as high-intensity (HI) exercise. Distance runners may benefit from LI-BFR running in periods of reduced volume or intensity, possibly due to injury. PURPOSE: To compare HR, VO2, blood lactate (BLa), and RPE during LI-BFR running and HI running without BFR. METHODS: Fifteen female distance runners (age 23+4yrs, height 1.67+0.50m, body mass 57.6+5.7kg, VO2max 51.0+4.5mL•kg-1•min-1) completed three randomized 12-minute running conditions: LI control (40% VO2max), HI (80% VO2max), and LI-BFR (40% VO2max). VO2, HR, and RPE were measured at rest, and every 3-minutes. BLa was measured at rest, immediately-post (ImmPost), and 3-minutes post-exercise (3minPost). RESULTS: VO2 remained steady among each condition (p=0.075,ηp2=0.155). The average VO2 differed between the conditions (p<0.001), as HI (39.4+3.9mL•kg-1•min-1) > LI-BFR (25.3+2.6mL•kg-1•min-1) > LI (22.5+3.1mL•kg-1•min-1). HR increased at the onset of exercise and differed between the conditions (p<0.001,ηp2=0.745). The average HR for HI, LI-BFR, and LI were 166+8bpm, 142+13bpm, and 124+11bpm, respectively. BLa was similar in HI and LI-BFR ImmPost and 3minPost (p>0.05), and both were higher than LI (p<0.017). Average RPE in the HI and LI-BFR conditions were similar (p=0.236). CONCLUSION: HI elicits greater VO2 and HR responses than LI-BFR running, suggesting that HI would result in more robust long-term training responses. However, if one cannot engage in HI running because of injury and rehabilitation, LI-BFR running could be a feasible temporary alternative.

First Advisor

Summer Cook

College or School

CHHS

Department or Program

Exercise Science

Degree Name

Bachelor of Science

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