Predictors of Fat Oxidation and Caloric Expenditure With and Without Weighted Vest Running.

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ID: 57775
2019
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Abstract
Purdom, TM, Mermier, C, Dokladny, K, Moriarty, T, Lunsford, L, Cole, N, Johnson, K, and Kravitz, L. Predictors of fat oxidation and caloric expenditure with and without weighted vest running. J Strength Cond Res XX(X): 000-000, 2019-This study evaluated the effect of weighted vest running (WVR) on fatty acid oxidation (FAox) and caloric expenditure at predesignated steady-state exercise intensities. Seventeen recreationally trained runners (9 men and 8 women) performed 4 separate graded exercise tests (GXTs) separated by at least 24 hours. The first GXT was a V[Combining Dot Above]O2max test to establish running velocities (percentage of max) at the prespecified exercise intensities (60, 65, 70, 75, and 80% V[Combining Dot Above]O2max). The following randomized WVR trials included a control (no vest), 5% body mass (BM) vest, and 10% BM vest using 3-minute incrementally increasing steady-state stages. Indirect calorimetry was used to measure both FAox (g·min) and caloric expenditure (kcal·min) at each stage. The ANOVA/ANCOVA analysis revealed that intensity had the largest effect on and FAox (p < 0.001) while WVR had a significant main effect on both caloric expenditure and FAox (p < 0.05). Pairwise comparisons revealed that the 10% BM significantly increased caloric expenditure for all exercise intensities compared with control and 5% BM (except 60% V[Combining Dot Above]O2max), while FAox decreased in the 10% BM 70 and 75% V[Combining Dot Above]O2max intensities only. Marginal r-squared (Rm) demonstrate that when sex + fat-free mass (FFM) + fat mass (FM) were included as covariates, sex was a significant predictor of caloric expenditure but was further explained by the large FFM (kg) differences between the sexes significantly influencing caloric expenditure (Rm = 0.87, p < 0.001). Exercise intensity, body composition (FFM + FM), and external mass placement are relevant considerations for runners looking to maximize FAox and caloric expenditure.
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purdom2019predictorsjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Purdom, Troy M;Mermier, Christine;Dokladny, Karol;Moriarty, Terence;Lunsford, Leigh;Cole, Nathan;Johnson, Kelly;Kravitz, Len;
Journal journal of strength and conditioning research
Year 2019
DOI
10.1519/JSC.0000000000003049
URL
Keywords
glycemic control continuous glucose monitoring glycemic variability exercise walking office workers cgm circuit training exercise-meal timing inactivity sitting breaks sitting time standing

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