Table 3.

Test–retest reliability, standard error of measurement, and smallest detectable change.

Measurement	Test, Median (IQR)	Retest, Median (IQR)	p-Value a	ICC b	95% CI for ICC	SEM% c	SDC% c
Isometric
Knee extension
Peak torque (Nm)	65.9 (12.2–142.8)	61.0 (13.3–124.8)	0.407	0.995	0.990–0.998	9%	25%
Knee flexion
Peak torque (Nm)	26.2 (16.1–67.1)	27.5 (14.8–63.4)	0.447	0.983	0.964–0.992	12%	33%
Elbow extension
Peak torque (Nm)	14.7 (7.8–28.3)	13.6 (9.6–25.2)	0.669	0.977	0.955–0.988	11%	31%
Elbow flexion
Peak torque (Nm)	11.5 (7.2–25.3)	11.4 (7.5–24.8)	0.649	0.991	0.983–0.995	9%	24%
Isokinetic
Knee extension
Peak torque (Nm)	62.8 (15.8–111.0)	65.1 (16.6–114.2)	0.794	0.988	0.974–0.994	9%	25%
Average power (W)	40.4 (9.2–68.8)	44.9 (9.0–63.3)	0.706	0.990	0.978–0.995	13%	37%
Knee flexion
Peak torque (Nm)	27.6 (20.6–72.1)	27.0 (20.0–65.5)	0.190	0.981	0.955–0.992	10%	29%
Average power (W)	18.9 (11.7–43.0)	18.1 (12.4–40.4)	0.425	0.972	0.934–0.989	14%	38%
Elbow extension
Peak torque (Nm)	19.9 (12.0–33.4)	18.0 (12.1–34.2)	0.937	0.979	0.946–0.992	11%	29%
Average power (W)	14.4 (8.6–33.3)	12.4 (8.6–33.2)	0.846	0.991	0.977–0.997	9%	25%
Elbow flexion
Peak torque (Nm)	18.1 (12.5–31.4)	19.2 (11.3–33.4)	0.045	0.977	0.932–0.991	7%	20%
Average power (W)	14.4 (8.3–27.3)	15.3 (7.4–28.1)	0.996	0.978	0.944–0.992	9%	26%

^a p-value calculated with log-transformed data; ^b ICC calculated with log-transformed data; ^c No absolute value, only ratio calculated with log-transformed data. IQR (interquartile range), ICC (intraclass correlation coefficient), CI (confidence interval), SEM (standard error of measurement), SDC (smallest detectable change), Nm (Newton meter), W (watt).