Fig. 3From: Correlation between cardiopulmonary metabolic energy cost and lower-limb muscle activity during inclined treadmill gait in older adultsChanges in the percentage of MVC during the gait cycle according to treadmill inclination; RA, rectus abdominis; ES, erector spinae; RF, rectus femoris; BF, biceps femoris; VM, vastus medialis; TA, tibialis anterior; GCM, medial head of the gastrocnemius; SOL, soleus (*p < 0.05, * *p < 0.01)Back to article page