NDLI: Inverse relationship between exercise economy and oxidative capacity in muscle

Content Provider	Springer Nature Link
Author	Hunter, Gary R. Bamman, Marcas M. Larson Meyer, D. Enette Joanisse, Denis R. McCarthy, John P. Blaudeau, Tamilane E. Newcomer, Bradley R.
Copyright Year	2005
Abstract	An inverse relationship has been shown between running and cycling exercise economy and maximum oxygen uptake $$\left(\dot{V}\hbox{O}_{2{\rm max}}\right).$$ The purposes were: 1) determine the relationship between walking economy and $$\dot{V}\hbox{O}_{2{\rm max}};$$ and 2) determine the relationship between muscle metabolic economy and muscle oxidative capacity and fiber type. Subjects were 77 premenopausal normal weight women. Walking economy $$\left(1/\dot{V}\hbox{O}_{2}\right)$$ was measured at 3 mph and $$\dot{V}\hbox{O}_{2{\rm max}}$$ during graded treadmill test. Muscle oxidative phosphorylation rate (OxPhos), and muscle metabolic economy (force/ATP) were measured in calf muscle using 31P MRS during isometric plantar flexion at 70 and 100% of maximum force, (HI) and (MI) respectively. Muscle fiber type and citrate synthase activity were determined in the lateral gastrocnemius. Significant inverse relationships (r from −0.28 to −0.74) were observed between oxidative metabolism measures and exercise economy (walking and muscle). Type IIa fiber distribution was inversely related to all measures of exercise economy (r from −0.51 to −0.64) and citrate synthase activity was inversely related to muscle metabolic economy at MI (r=−0.56). In addition, Type IIa fiber distribution and citrate synthase activity were positively related to $$\dot{V}\hbox{O}_{2{\rm max}}$$ and muscle OxPhos at HI and MI (r from 0.49 to 0.70). Type I fiber distribution was not related to any measure of exercise economy or oxidative capacity. Our results support the concept that exercise economy and oxidative capacity are inversely related. We have demonstrated this inverse relationship in women both by indirect calorimetry during walking and in muscle tissue by 31P MRS.
Starting Page	558
Ending Page	568
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	94
Issue Number	5
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-06-15
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Muscle metabolism Maximum oxygen uptake Efficiency Muscle fiber types
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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