Abstract
Aging is associated with loss of endurance; however, aging is also associated with decreased fatigue during maximal isometric contractions. The aims of this study were to examine the relationship between age and walking endurance (WE) and maximal isometric fatigue (MIF) and to determine which metabolic/fitness components explain the expected age effects on WE and MIF. Subjects were 96 pre-menopausal women. Oxygen uptake (walking economy) was assessed during a 3-mph walk; aerobic capacity and WE by progressive treadmill test; knee extension strength by isometric contractions, MIF during a 90-s isometric plantar flexion (muscle metabolism measured by 31P MRS). Age was related to increased walking economy (low VO2, r = −0.19, P < 0.03) and muscle metabolic economy (force/ATP, 0.34, P = 0.01), and reduced MIF (−0.26, P < 0.03). However, age was associated with reduced WE (−0.28, P < 0.01). Multiple regression showed that muscle metabolic economy explained the age-related decrease in MIF (partial r for MIF and age −0.13, P = 0.35) whereas walking economy did not explain the age-related decrease in WE (partial r for WE and age −0.25, P < 0.02). Inclusion of VO2max and knee endurance strength accounted for the age-related decreased WE (partial r for WE and age = 0.03, P > 0.80). In premenopausal women, age is related to WE and MIF. In addition, these results support the hypothesis that age-related increases in metabolic economy may decrease MIF. However, decreased muscle strength and oxidative capacity are related to WE.
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Acknowledgments
We acknowledge Bob Petri, David Bryan, Amy Thomas, and Betty Darnell for technical assistance and Paul Zuckerman for Program coordinating. We wish to thank our sources of support: NIH grants R01 DK 49779, R01 DK51684, R01 AG027084-S1, General Clinical Research Center grant M01-RR00032, Clinical Nutrition Research Unit grant P30-DK56336, and UAB University-Wide Clinical Nutrition Research Center grant. The Nestlé Food Co., Solon, OH, USA, and the Stouffer’s Lean Cuisine® provided food entrées. We have no professional relationships with companies or manufacturers who will benefit from the results of the present study.
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Communicated by Klaas Westerterp.
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Hunter, G.R., Bickel, C.S., Corral, P.D. et al. Age, muscle fatigue, and walking endurance in pre-menopausal women. Eur J Appl Physiol 111, 715–723 (2011). https://doi.org/10.1007/s00421-010-1694-1
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DOI: https://doi.org/10.1007/s00421-010-1694-1