Fat metabolism and acute resistance exercise in trained women

Brittany R. Allman, Margaret C. Morrissey, Jeong Su Kim, Lynn B. Panton, Robert J. Contreras, Robert C. Hickner, Michael J. Ormsbee

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10 Citations (Scopus)

Abstract

This study investigated the effect of acute full-body resistance exercise [RE; one set of 10 repetitions at 40% 1 repetition maximum (1RM) and three sets of 10 repetitions at 65% 1RM] on subcutaneous abdominal adipose tissue (SCAAT) lipolysis and whole body substrate oxidation in young (age: 22 1 yr), normal-weight and body fatness (body mass index: 20 1 kg/m2; %body fat: 28.7 1.4%), resistance-trained women. Microdialysis was used to measure SCAAT lipolysis at baseline, mid-RE, post-RE, and 30 min post-RE, and indirect calorimetry was used to measure whole body substrate oxidation at baseline and immediately post-RE in 13 women. Plasma concentrations of glucose, insulin, nonesterified fatty acids (NEFA), glycerol, growth hormone (GH), epinephrine (Epi), and norepinephrine (NE) were measured at baseline, mid-RE, and post-RE. Lipolysis (dialysate glycerol concentration) was elevated post-RE (baseline: 596.7 82.8, post-RE: 961.4 116.3 M, P 0.01). Energy expenditure (baseline: 1,560 49; post-RE: 1,756 68 kcal/day; P 0.02) and fat oxidation (baseline: 5.64 0.24; post-RE: 7.57 0.41 g/h; P 0.0003) were elevated post-RE. GH (baseline: 513.1 147.4; mid-RE: 1,288.3 83.9; post-RE: 1,522.8 51.1 pg/ml, P 0.000), Epi (baseline: 23.2 2.7; mid-RE: 92.5 16.6; post-RE: 84.5 21.4 pg/ml, P 0.000), and NE (baseline: 139.2 13.6; mid-RE: 850.9 155.3; post-RE: 695.3 93.5 pg/ml, P 0.000) were higher at mid-RE and post-RE. Therefore, one of the potential mechanisms behind RE-induced fat mass changes in resistance-trained women may be in part due to the accumulated effect of transient increases in SCAAT lipolysis, fat oxidation, and energy expenditure, mediated by GH, Epi, and NE release.

Original languageEnglish
Pages (from-to)739-745
Number of pages7
JournalJournal of Applied Physiology
Volume126
Issue number3
DOIs
Publication statusPublished - 29 Sept 2018
Externally publishedYes

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