The results suggest that this measure of muscle extensibility is reliable in the gastrocnemius/soleus muscle with fullterm and preterm newborns. Further research is needed to investigate if differences in muscle extensibility are present between fullterm and preterm infants and the relationship between muscle extensibility and active movement.
Muscle length differences are present between infants born full-term and infants born preterm. These differences are most likely due to differences in tendon length.
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