Meeting Banner
Abstract #1622

Glycogen Concentration and Bioenergetics in Young and Older Women

Anne Tonson1, Jacob Deblois1, Jessica Fay1, Steve Foulis1, Douglas E. Befroy2, Jane Kent-Braun1

1Department of Kinesiology, University of Massachusetts, Amherst, MA, United States; 2Magnetic Resonance Research Center, Yale University, New Haven, CT, United States

The purpose of this study was to investigate muscle metabolic economy and [glycogen] in relation to ATP flux during brief voluntary contractions, using 13 C and 31P magnetic resonance spectroscopy (MRS) in young and older women. Although intramuscular fat was lower in young than older women, muscle size, specific strength, [glycogen], metabolic economy and the contributions of PCr, glycolysis and oxidative metabolism were not different by age. These results suggest that energetics do not differ in the unfatigued muscles of young and old.

Abstract PDF

Keywords

acorn acquisitions activity additional adiabatic adults ankle arise assembly atrophy bars blocks coil comp concentration conditions conjunction containing contraction contractions contribute contribution cost cross daily dark decoupling decreased demand described determine determined differ economy energetic energetics energy exhibits extend fatigue fatiguing fibers fitting flux force free function glycogen greater haven healthy in vivo intramuscular investigate investigated isometric mainly markedly mass matrix maximal measured metabolic metabolism metabolites muscle muscles needed notably nuts older open oxidative pathway peak phantom phosphorus physical potential previously probe processed production pulse quadrature quantified reaction related relation reliance report representative resistance respectively rest role sectional selective short similarities skeletal slice software spectra spectroscopy sports strength studies suggesting suggests surface system twitch type unfatigued units waltz whether woman women year years young