Plantar flexion is very important in everyday life activities. It is a base for walking, runing and lifts on the anterior part of the foot. We use plantar flexion exercise for increasing the magnitude of the force and power of plantar flexors. It is also used as part of a rehabilitation program after an Achilles tendon injury. The purpose of our resarch is to investigate the involvement of the calf muscles in lifting on the toes at a reduce support area in sport active individuals. Research included 21 voluntary subjects. We measured the rise on the anterior part of the foot at a reduce support area on the medial and lateral side. We also measured muscle EMG signal, which was normalized to MVIC. Results show us six statistically significant differences between the neutrally supported anterior part of the foot of the caput mediale musculi gastrocnemii, compared to the laterally and medially supported anterior part of the foot. There was a statistically significant difference in muscle activation for caput mediale musculi gastrocnemii between medially and laterally supported anterior part of the foot, bigger activation was at medially supported anterior part of the foot. Difference was also found in the caput laterale musculi gastrocnemii between neutrally or laterally supported anterior part of the foot. In the same muscle, there is also a difference in muscle activation between medially and laterally supported anterior part of the foot. A similar differences were found in activation of musculus soleus. Musculus soleus is more activated when anterior part of the foot is supported neutrally than if it is laterally and it is also more activated when anterior part of the foot is medially supported than if it is supported laterally. We can conclude that the support of the anterior part of the foot does not affect the activation of calf muscles. Lifting to the anterior part of the foot at a reduced support surface does not make a difference beacuse caput mediale and caput laterale of musculus gastrocnemius are less activated when medially or laterally supported then when anterior part of the foot is neutrally supported.
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