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

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, decr

SUBMITTER: Beck ON 

PROVIDER: S-EPMC7482283 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature