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a Department of Kinesiology, University of Maryland, College Park
b University of Maryland School of Medicine, Baltimore VA Medical Center, Baltimore
c Department of Kinesiology and Applied Physiology, University of Colorado, Boulder
d The Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Medford, Massachusetts
e National Institute on Aging, Gerontology Research Center, Baltimore, Maryland
f Florida Geriatric Research Program, Morton Plant Mease Health Care, Clearwater
B. F. Hurley, Department of Kinesiol- ogy, University of Maryland, College Park, MD 20742 E-mail: bh24{at}umail.umd.edu.
Jay Roberts, PhD
Maximal force production per unit of muscle mass (muscle quality, or MQ) has been used to describe the relative contribution of non-muscle-mass components to the changes in strength with age and strength training (ST). To compare the influence of age and gender on MQ response to ST and detraining, 11 young men (20–30 years), nine young women (20–30 years), 11 older men (65–75 years), and 11 older women (65–75 years), were assessed for quadriceps MQ at baseline, after 9 weeks of ST, and after 31 weeks of detraining. MQ was calculated by dividing quadriceps one repetition maximum (1RM) strength by quadriceps muscle volume determined by magnetic resonance imaging. All groups demonstrated significant increases in 1RM strength and muscle volume after training (all p < .05). All groups also increased their MQ with training (all p < .01), but the gain in MQ was significantly greater in young women than in the other three groups (p < .05). After 31 weeks of detraining, MQ values remained significantly elevated above baseline levels in all groups (p < .05), except the older women. These results indicate that factors other than muscle mass contribute to strength gains with ST in young and older men and women, but those other factors may account for a higher portion of the strength gains in young women. These factors continue to maintain strength levels above baseline for up to 31 weeks after cessation of training in young men and women, and in older men.
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