The interplay between gastrocnemius medialis force–length and force–velocity potentials, cumulative EMG activity and energy cost at speeds above and below the walk to run transition speed

Luca Paolo Ardigò, m.fl.

(Publisert i Experimental Physiology, november 2022)

The force–length and force–velocity potentials of gastrocnemius medialis during human walking decrease as a function of speed; this decrease is associated with an increase in cumulative EMG activity and in the energy cost of locomotion. Switching from fast walking to running is associated to an increase in the force potentials, supporting the idea that the "metabolic trigger" that determines the transition from walking to running is ultimately driven by a reduction of the muscle's contractile capacity.

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