Predictors of Fat Oxidation and Caloric Expenditure With and Without Weighted Vest Running : The Journal of Strength & Conditioning Research

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

Purdom, Troy M.1,2; Mermier, Christine2; Dokladny, Karol3; Moriarty, Terence2; Lunsford, Leigh4; Cole, Nathan2; Johnson, Kelly2; Kravitz, Len2

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Journal of Strength and Conditioning Research 35(7):p 1865-1872, July 2021. | DOI: 10.1519/JSC.0000000000003049


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 35(7): 1865–1872, 2021—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 V̇o2max test to establish running velocities (percentage of max) at the prespecified exercise intensities (60, 65, 70, 75, and 80% V̇o2max). 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−1) and caloric expenditure (kcal·min−1) 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% V̇o2max), while FAox decreased in the 10% BM 70 and 75% V̇o2max intensities only. Marginal r-squared (Rm2) 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 (Rm2 = 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.

© 2019 National Strength and Conditioning Association

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