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. 2015 Aug;27(8):2435-7.
doi: 10.1589/jpts.27.2435. Epub 2015 Aug 21.

Effects of visibility and types of the ground surface on the muscle activities of the vastus medialis oblique and vastus lateralis

Jeong-Ki Park  1 , Dong-Yeop Lee  1 , Jin-Seop Kim  1 , Ji-Heon Hong  1 , Jae-Ho You  1 , In-Mo Park  2
Affiliations

Effects of visibility and types of the ground surface on the muscle activities of the vastus medialis oblique and vastus lateralis

Jeong-Ki Park et al. J Phys Ther Sci. 2015 Aug.

Abstract

[Purpose] The purpose of this study was to compare the effects of visibility and types of ground surface (stable and unstable) during the performance of squats on the muscle activities of the vastus medialis oblique (VMO) and vastus lateralis (VL). [Subjects and Methods] The subjects were 25 healthy adults in their 20s. They performed squats under four conditions: stable ground surface (SGS) with vision-allowed; unstable ground surface (UGS) with vision-allowed; SGS with vision-blocked; and UGS with vision-blocked. The different conditions were performed on different days. Surface electromyogram (EMG) values were recorded. [Results] The most significant difference in the activity of the VMO and VL was observed when the subjects performed squats on the UGS, with their vision blocked. [Conclusion] For the selective activation of the VMO, performing squats on an UGS was effective, and it was more effective when subjects' vision was blocked.

Keywords: Unstable; VMO; Vision.

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