Table 2. Covariance analysis results for the effect of different levels of motivational quality and preference on running performance (n=75).

Variable origin	SS	df	MS	F	p
Without music	3685248.343	1	3685248.343	108.606	.000
Preference	150655.324	1	150655.324	4.440*	.040
Motivational quality	95752.626	1	95752.626	2.822	.099

p < 0.05.