Effects of Two Different Cadences in Muscle Coactivation of Competitive Cyclists
نویسندگان
چکیده
The aim of this study was to compare the effects of two different cadences at a constant workload on muscle activity and muscle coactivation of competitive cyclists. Two cadences were tested (70 and 90 rpm) at a constant power output related to the second ventilatory threshold (325 ±35W). Activation of tibialis anterior (TA), medial head of gastrocnemius (GM), soleus (Sol), long head of biceps femoris (BF) and vastus medialis (VM) muscles were assessed during the propulsion phase of crank cycle (0-180° of crank cycle) using surface electromyography. Superimposed timing was used to compute coactivation between antagonist muscles. Lower coactivation at 90 rpm compared to 70 rpm (p<0.01) was observed for BF/VM. Cyclists should use cadences close to 90 rpm to reduce muscle coactivation and improve their pedalling technique and cycling economy.
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