Table 2. One-way repeated measures ANOVA of UT, MT, LT muscle activity according to trunk angle

Trunk angle	UP 0°	FL 30°	BL 20°	F(P)
UT muscle activity (%MVIC)	15.36±3.31	16.12±4.53	41.96±15.21	72.090 (.000)
MT muscle activity (%MVIC)	60.82±17.49	59.48±18.64	51.77±14.93	4.164 (.022)
LT muscle activity (%MVIC)	49.85±17.37	61.47±17.83	36.71±12.04	43.554 (.000)

Abbreviation: UP, upright posture; FL, forward lean; BL, backward lean; UT, upper trapezius; MT, middle trapezius; LT, lower trapezius; MVIC, Maximal voluntary isometric contraction.