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Author ORCID Identifier

https://orcid.org/0009-0009-9524-7519

Date Available

4-28-2026

Year of Publication

2026

Document Type

Master's Thesis

Degree Name

Master of Science (MS)

College

Education

Department/School/Program

Kinesiology and Health Promotion

Faculty

Haley Bergstrom

Abstract

Theoretically, the gas exchange threshold (GET) demarcates the moderate and heavy intensity domains, whereby exercise performed at and below the GET results in a change in oxygen consumption ([ΔVO2] ≤ 200 mL), and exercise above the GET results in a slow component (ΔVO2 > 200 mL). This study examined the reliability and validity of the GET. 14 subjects performed two maximal graded exercise tests (GXTs) to determine the GET and its reliability. The minimal difference (MD = 21W) was applied to determine the GET above (GET+MD) and below (GET-MD) power outputs for 30 min trials at the GET, GET-MD, and GET+MD. Physiological, perceptual, and neuromuscular parameters were assessed during each trial. The GET demonstrated “excellent” reliability. Trials at the GET and GET+MD demonstrated a ΔVO2 > 200 mL, but the GET-MD trial resulted in a ΔVO2 ≤ 200 mL. Physiological and perceptual responses increased across trials and time, but there were no differences in the magnitude of change for neuromuscular responses between trials. The GET did not reflect a valid demarcation of the moderate and heavy domains. Increases in perceptual responses across all trials were more consistently related to systemic than local factors.

Digital Object Identifier (DOI)

https://doi.org/10.13023/etd.2026.140

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