Cyclically producing the same average muscle-tendon force with a smaller duty increases metabolic rate

Author:

Beck Owen N.12ORCID,Gosyne Jonathan1,Franz Jason R.3ORCID,Sawicki Gregory S.12

Affiliation:

1. The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 455 Callaway Manufacturing Research Center Building, 813 Ferst Drive NW, Atlanta, GA 30332, USA

2. The School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA

3. Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, NC, USA

Abstract

Ground contact duration and stride frequency each affect muscle metabolism and help scientists link walking and running biomechanics to metabolic energy expenditure. While these parameters are often used independently, the product of ground contact duration and stride frequency (i.e. duty factor) may affect muscle contractile mechanics. Here, we sought to separate the metabolic influence of the duration of active force production, cycle frequency and duty factor. Human participants produced cyclic contractions using their soleus (which has a relatively homogeneous fibre type composition) at prescribed cycle-average ankle moments on a fixed dynamometer. Participants produced these ankle moments over short, medium and long durations while maintaining a constant cycle frequency. Overall, decreased duty factor did not affect cycle-average fascicle force ( p ≥ 0.252) but did increase net metabolic power ( p ≤ 0.022). Mechanistically, smaller duty factors increased maximum muscle-tendon force ( p < 0.001), further stretching in-series tendons and shifting soleus fascicles to shorter lengths and faster velocities, thereby increasing soleus total active muscle volume ( p < 0.001). Participant soleus total active muscle volume well-explained net metabolic power ( r = 0.845; p < 0.001). Therefore, cyclically producing the same cycle-average muscle-tendon force using a decreased duty factor increases metabolic energy expenditure by eliciting less economical muscle contractile mechanics.

Funder

National Institute of Health's Institute of Aging

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Environmental Science,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine

Reference45 articles.

1. Muscles do more positive than negative work in human locomotion

2. The energetic benefits of tendon springs in running: is the reduction of muscle work important?

3. Energetic cost of generating muscular force during running: a comparison of large and small animals;Taylor CR;J. Exp. Biol.,1980

4. A unified theory for the energy cost of legged locomotion

5. Mechanical work for step-to-step transitions is a major determinant of the metabolic cost of human walking;Donelan JM;J. Exp. Biol.,2002

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