Table 3. Relative (%) changes in electromyographic (EMG) activity between pre-test and week 3 test for the different stability requirements.

	Muscle	Low stability requirement	Medium stability requirement	High stability requirement
EMG#	Vastus medialis	15.3 ± 53.8 ES# = 0.01	30.5 ± 73.5% ES = 0.33	26.8 ± 64.6% ES = 0.23
	Vastus lateralis	14.3 ± 53.9% ES = 0.20	17.7 ± 57.0% ES = 0.24	15.6 ± 38.5% ES = 0.34
	Rectus femoris	11.9 ± 48.7% ES = 0.04	14.6 ± 55.9% ES = 0.18	18.0 ± 59.1% ES = 0.28
	Soleus	36.2 ± 99.7% ES = 0.31	56.7 ± 51.6% * ES = 0.45	44.6 ± 101.8% * ES = 0.52
	Biceps femoris	6.9 ± 46.5% ES = 0.11	8.5 ± 37.2% ES = 0.20	49.7 ± 199.1% ES = 0.34

* Greater EMG activity at week 3 test p<0.05.

# ES = effect size, EMG = electromyography.