A portable isometric knee extensor strength testing device: test-retest reliability and minimal detectable change scores of the Q-Force ӀӀ in healthy adults

Hartog, Johanneke; Dijkstra, Sandra; Fleer, Joke; van der Harst, Pim; Mariani, Massimo A.; van der Woude, Lucas H. V.

doi:10.1186/s12891-021-04848-8

Table 2 Reported reliability measures (ICC, SEM, and MDC) of different knee extensor strength devices

From: A portable isometric knee extensor strength testing device: test-retest reliability and minimal detectable change scores of the Q-Force ӀӀ in healthy adults

Author	Year	Sample	Age Mean ± SD	n	Device (stabilizer)	TBS	Knee angle	Leg	ICC	Torque (Nm) Mean ± SD	SEM (%)^a	MDC (%)^b
HHD
Bohannon [21]	2013	Healthy adults	26.0 ± 2.4	8	MicroFET 2	7 days	90°	NR	0.50-0.77^d	UtC	UtC	UtC
Roebroeck [23]	1998	IOKD	35 (13-77)	30	CAHN-DE	1 h	25°	NR	NR	44^e	6.9 (15.7)	19.2 (43.6)
Bohannon [34]^c	1993	Acute hospitalized	NR	21	Ametek	NR	NR	Left	0.95	34.8 ± 26.5	5.9 (17.1)	13.4 (38.5)
								Right	0.84	36.8 ± 30.0	12.0 (32.6)	27.6 (75.1)
Roy [35]	2004	Hip fracture	79 ± 7	16	Lafayette	1-2 days	90°	Un-fractured	0.90	45.8 ± 13.2	4.2 (9.2)	11.6 (25.4)
Fixed HHD
Bohannon [21]	2013	Healthy adults	26.0 ± 2.4	8	MicroFET 2 (belt)	7 days	90°	NR	0.87-0.92^d	UtC	UtC	UtC
Jackson [24]	2017	Athletes	34.3 ± 3.5	15	MicroFET 2 (StabD)	15 min	90°	Left & Right	0.93	80.9 ± 22.4	5.9 (7.3)	16.4 (20.3)
Katoh [26]	2014	Healthy Elderly	65 to 79	186	цTas F-1 (belt)	30 s	90°	Dominant	0.96	9.6 ± 3.0	0.6 (6.3)	1.7 (17.4)
Katoh [25]	2009	Healthy adults	21.9 ± 1.5	37	цTas MF-01 or F-1 (belt)	7 days	90°	Dominant (right)	0.91	14.3 ± 4.6	1.4 (9.7)	3.8 (26.8)
Portable chair-based strength devices
Verkerke [28]	2003	Healthy adults	28.1 ± 6.5	20	Quadriso-tester	1 day	90°	Left	0.94	184.5 ± 48.6	11.9 (6.5)	33.0 (17.9)
								Right	0.92	188.8 ± 47.6	13.4 (7.1)	37.3 (19.8)
Douma [27]	2016	Healthy Elderly	81.9 ± 4.9	42	Q Force	3-8 days	70°	Left	0.89	66.9 ± 28.2	9.4 (14.0)	25.9 (38.8)
								Right	0.96	70.5 ± 32.3	6.5 (9.2)	17.9 (25.4)
Isokinetic dynamometer
Maffiuletti [14]	2007	Healthy adults	30 ± 5	30	Con-Trex	7 days	60°	Dominant	0.98	217.8 ± 59.8	7.8 (3.6)	21.6 (9.9)
Carvalho [36]	2013	Healthy adults	23 ± 3	24	REV9000	7 days	60°	Left	0.93	235.5 ± 44.7	11.8 (4.8)	32.8 (13.3)
								Right	0.96	253.0 ± 52.7	10.5 (4.2)	29.2 (11.5)
Flansbjer [37]	2010	Persons with late effects of Polio	63 ± 6.4	30	Biodex 3 PRO	7 days	90°	Less-affected	0.98	137.7 ± 59.1	8.4 (4.7)	24.5 (17.8)^f

ICC Intra Class Correlation, IOKD Isolated orthopaedic knee disorders, MDC Minimal Detectable Change, NR Not reported, SEM Standard Error of Measurement, TBS Time between sessions, UtC Unable to calculate; 0° = full extension. ^aEstimated using equation: SD * wortel (1-ICC); ^bEstimated using equation: SEM*1.96*√(2); ^cInformation extracted from Bohannon et al., 2010 [34]; ^dRange ICC from male and female testers; ^eEstimated from Fig. 2 of Roebroeck et al., 1998 [23]; ^fMean of upper and lower limit

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