Activation of the upper trapezius, lower trapezius, serratus anterior, and triceps brachii muscles was measured, while center of pressure excursion beneath the hands was simultaneously monitored, during the performance of a push-up exercise on both a stable and an unstable base of support. The activation levels of all muscles were significantly greater for the unstable support surface when compared to those for a stable support surface (p < 0.05). A negative correlation was found between activation of the serriatus anterior muscle and center of pressure excursion (r = -0.64, p < 0.05). Performance of the push-up exercise on an unstable support surface appears to elicit greater muscle activation than a standard push-up exercise performed on a stable support surface.
Se-yeon Park is with the Department of Physical Therapy, Inje University, Korea.
Won-gyu Yoo is with the Department of Physical Therapy, Inje University, Korea.
Hun Kwon, Dong-hyun Kim, Si-eun Lee, and Mi-jin Park are undergraduate students with the Department of Physical Therapy, Inje University, Korea.