Energy expenditure and substrate utilization in older women after strength training: 24-h calorimeter results.

Academic Article

Abstract

  • The purpose of this study was to examine the effects of strength training (ST) in healthy older women on 24-h energy expenditure (EE) and its components and on 24-h substrate utilization. Thirteen women (age 67 +/- 1 yr) exercised three times per week for 16 wk in a total body ST program. EE components and substrate utilization were determined for 24 h in an indirect room calorimeter before and after training. The ST invoked a 47% increase in upper body and a 66% increase in lower body strength (P < 0.001). Body weight, percent body fat, and fat-free mass did not change significantly; however, midthigh muscle area increased (55.2 +/- 3.1 vs. 60.4 +/- 2.3 cm2; P < 0.05). There are a significant increase in resting EE (5,017 +/- 218 vs. 5,473 +/- 213 kJ/day; P < 0.05) but no significant changes in sleeping EE (4,929 +/- 180 vs. 5,067 +/- 251 kJ/day), diet-induced thermogenesis (359 +/- 25 vs. 393 +/- 33 kJ/day), activity EE (682 +/- 84 vs. 381 +/- 117 kJ/day), or 24-h EE (6,054 +/- 188 vs. 6,247 +/- 243 kJ/day). The increase in resting EE was not significant after the increase in muscle area is taken into account. The 24-h nonprotein respiratory quotient decreased (0.90 +/- 0.01 vs. 0.82 +/- 0.01; P < 0.001), revealing a significant increase in 24-h fat oxidation (42 +/- 6 vs. 81 +/- 7 g/day) and a decrease in carbohydrate oxidation (180 +/- 14 vs. 113 +/- 10 g/day; both P < 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
  • Authors

    Keywords

  • Aging, Calorimetry, Carbohydrate Metabolism, Eating, Energy Metabolism, Exercise, Fats, Female, Humans, Middle Aged, Proteins
  • Digital Object Identifier (doi)

    Author List

  • Treuth MS; Hunter GR; Weinsier RL; Kell SH
  • Start Page

  • 2140
  • End Page

  • 2146
  • Volume

  • 78
  • Issue

  • 6