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Relationship between perceived limiter and respiratory compensation point in recreational runners

Abstract

PURPOSE: Endurance athletes report feelings of exertion related to central cardiorespiratory factors and peripheral muscular fatigue factors. Such perceptions are used in training load monitoring; yet, little work has demonstrated a link between these feelings of exertion and concrete physiological phenomena. This study investigated the relationship between primary perceived limiter and respiratory compensation point in recreational runners. METHODS: Twenty-eight recreationally active subjects (Males = 16; Females = 12) completed a maximal graded treadmill test that established V̇O2MAX and respiratory compensation point (RCP). Subjects returned to the lab to complete a constant speed time to exhaustion run 1% gradient steeper than their RCP. Following each run subjects indicated whether their primary perceived limiter as “Heart and Lungs” or “Leg Fatigue.” Subjects were grouped based upon their limiter during the second trial, and RCP was compared between groups using a two-sample t-test. A linear mixed-effects model assessed differences in peak V̇O2 between trials, and a general linear mixed model assessed differences in perceived limiter by visit. Significance for all analyses was set at p ≤ 0.05. RESULTS: No between-group differences were observed for RCP (Means: 86.1 ± 4.9% vs 84.4 ± 3.6% V̇O2MAX; p = 0.422); the linear mixed-effects model showed no effect for visit (Difference: -1.300 ± 0.805; p = 0.120), limiter (Difference: 0.117 ± 0.905; p = 0.898), or their interaction on V̇O2 (Difference: 0.223 ± 0.974; p = 0.821). There was no significant effect of visit on perceived limiter, albeit with large intersubject variability (Log Odds: 0.270 ± 0.740; p = 0.715). CONCLUSION: These data do not provide evidence to adjust training based on perceived limiter alone, as they do not support a link between limiter and RCP relative to V̇O2MAX. Further investigation into the context wherein these perceptions could provide such utility is warranted.

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