The Journal of Korean Physical Therapy

Table. 3.

Table. 3. Table 3

Pre-post comparison in UT, LT, SCM, SA, and PMa muscle fatigue according to backpack weight in each group (unit: Hz)

Group	Variables	Pre	Post	t	p
0%	UT	60.42± 7.78	60.41± 7.45	0.014	0.989
	LT	48.82± 6.09	49.31± 5.97	-1.582	0.148
	SCM	48.30± 12.53	45.68± 11.52	1.501	0.168
	SA	51.48± 11.03	51.12± 10.06	0.360	0.727
	PMa	34.15± 7.05	34.42± 7.61	-0.249	0.809
10%	UT	67.70± 8.21	62.81± 6.63	4.746	0.001^*
	LT	56.72± 9.25	51.65± 6.86	3.095	0.009^*
	SCM	44.03± 14.45	34.66± 13.06	3.203	0.008^*
	SA	54.98± 6.19	52.45± 6.06	2.254	0.044^*
	PMa	36.55± 7.17	34.44± 7.43	1.799	0.097
15%	UT	61.99± 8.66	57.11± 8.37	4.353	0.001^*
	LT	52.89± 8.49	48.24± 11.44	2.319	0.037^*
	SCM	47.50± 16.33	39.21± 15.78	3.317	0.006^*
	SA	56.77± 8.34	52.57± 9.19	2.807	0.015^*
	PMa	36.46± 10.73	33.06± 9.62	3.969	0.002^*
20%	UT	64.94± 6.69	59.82± 7.27	2.444	0.030^*
	LT	54.69± 8.69	51.88± 8.59	2.943	0.012^*
	SCM	49.40± 19.60	41.35± 15.46	2.372	0.034^*
	SA	57.64± 7.84	52.09± 9.35	2.643	0.020^*
	PMa	35.18± 8.10	31.34± 8.77	2.736	0.017^*

All values are reported as the mean± standard deviation. UT: upper trapezius, LT: lower trapezius, SCM: sternocleidomastoid, SA: serratus anterior, PMa: pectoralis major. ^*p< 0.05.

J Kor Phys Ther 2025;37:50-5 https://doi.org/10.18857/jkpt.2025.37.1.50