Table 1. Agreement between total, single repetition, and contraction-phase specific time-under-tension, determined from video recordings and stretch-sensor data.

Rater 3	Mean time based on stretch-sensor data. Seconds (±SD)	Mean time based on video recordings. Seconds (±SD)	Mean difference, seconds (95% CI)	Correlation	95% Limits of agreement (seconds)	Agreement (percentage of mean TUT from stretch-sensor)
Total TUT (n=15)	57.77 (9.02)	56.2 (8.91)	1.56 (1.13-2.00)*	1.00*	0.03-3.09	2.6%
Single repetition TUT (n=150)	5.78 (2.93)	5.62 (2.92)	0.16 (0.12-0.19)*	1.00*	-0.26-0.56	6.9%
Concentric TUT (n=150)	1.91 (1.30)	1.82 (1.28)	0.09 (0.06-0.11)*	0.99*	-0.22-0.40	16.2%
Eccentric TUT (n=150)	3.10 (2.07)	2.90 (2.07)	0.20 (0.16-0.23)*	0.99*	-0.21-0.61	13.2%

Abbreviations: TUT: Time-under-tension

^* p<0.00001