Table 3. Validity between IMS and MuscleLab to measure the peak and average velocity, force, and power by concentric and eccentric phase in the unilateral straight knee bridge.

	Concentric							Eccentric
	MuscleLab (SD)	IMS (SD)	Pearson’s r	LoA−/LoA+	Mean difference (%); effect size	SD difference (%)	SE difference	MuscleLab (SD)	IMS (SD)	Pearson’s r	LoA−/LoA+	Mean difference (%); effect size	SD difference (%)	SE difference
Velocity (m/s)
Peak	0.46 (0.15)	0.47 (0.13)	0.957	−0.08/0.10	0.01 (2.2%); 0.07	0.04 (8.7%)	0.01	0.64 (0.16)	0.57 (0.14)	0.947	−0.16/0.03	−0.06 (−9.4%); 0.43*	0.05 (7.8%)	0.01
Average	0.31 (0.08)	0.35 (0.10)	0.922	−0.04/0.12	0.04 (12.9%); 0.41*	0.04 (12.9%)	0.01	0.33 (0.09)	0.34 (0.09)	0.854	−0.08/0.11	0.01 (3.0%); 0.17	0.05 (15.2%)	0.01
Force (N)
Peak	670.2 (154.4)	599.3 (140.9)	0.953	−163.4/21.6	−70.9 (−10.6%); 0.48*	47.2 (7%)	12.2	491.9 (151.9)	428.9 (134.1)	0.958	−151.6/25.7	−63.0 (−12.8%); 0.44*	45.2 (9.2%)	11.7
Average	406.1 (100.2)	371.7 (85.1)	0.951	−98.3/29.6	−34.4 (−8.5%); 0.37*	32.6 (8%)	8.4	199.4 (95.4)	195.9 (79.1)	0.934	−73.0/66	−3.5 (−1.8%); 0.04	35.5 (17.8%)	9.2
Power (W)
Peak	220.1 (180.7)	181.7 (128.8)	0.969	−164.9/87.9	−38.4 (−17.4%); 0.24*	64.5 (29.3%)	16.6	149.4 (106.4)	158.9 (79.2)	0.806	−133.6/114.7	9.5 (6.4%); 0.10	63.4 (42.4%)	16.4
Average	88.4 (86.6)	90.3 (63.9)	0.917	−72.2/76.1	1.9 (2.1%); 0.02	37.8 (42.8%)	9.8	73.8 (21.1)	72.4 (19.7)	0.898	−19.7/16.7	−1.5 (−2.0%); 0.07	9.3 (12.6%)	2.4

Notes:

IMS: Inertial Measure System; SD: Standard deviation; LoA: Limit of agreement; SE: Standard error.

^*Significant differences between devices.