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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

The Journal of Strength & Conditioning Research: February 18, 2019 - Volume Publish Ahead of Print - Issue - p
doi: 10.1519/JSC.0000000000003049
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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−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% 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 (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.

1Department of Health, Athletic Training, Recreation, and Kinesiology, Longwood University, Farmville, Virginia;

Departments of 2Health, Exercise and Sports Sciences;

3Internal Medicine, University of New Mexico, Albuquerque, New Mexico; and

4Department of Mathematics and Computer Science, Longwood University, Farmville, Virginia

Address correspondence to Troy M. Purdom, purdomtm@longwood.edu.

Copyright © 2019 by the National Strength & Conditioning Association.