Two synergistic types of muscles were detected during forearm rotation exercise by T2 cumulative frequency curves using 0.2 T magnetic resonance imaging

Table 1 The Z values of T₂ in 10 forearm muscles before and after supination exercise

Muscle	Abbreviation	Function	25% MVC		15% MVC		5% MVC
Muscle	Abbreviation	Function	Mean	SD	Mean	SD	Mean	SD
a. Before exercise
Flexor carpi radialis	FCR		− 0.25	0.93	0.16	1.11	0.01	1.02
Flexor carpi ulnaris	FCU		0.29	1.11	− 0.01	1.21	0.05	1.25
Palmaris longus	PL		0.14	0.99	0.51	1.12	0.33	1.09
Flexor digitorum superficialis	FDS		0.58	1.05	0.26	1.14	− 0.12	1.05
Flexor digitorum profundus	FDP		0.06	1.08	0.25	1.14	− 0.10	1.08
Extensor carpi radialis longus/brevis	ECR		− 0.36	0.81	− 0.44	0.99	− 0.93	0.85
Extensor carpi ulnaris	ECU		0.46	1.11	0.51	1.40	0.40	1.16
Extensor digitorum	ED		0.62	1.01	0.52	1.02	0.19	1.11
Supinator	SM	Agonist	1.07	1.21	0.33	1.17	0.31	1.27
Pronator teres	PT		0.16	1.02	0.19	1.38	0.21	1.26
b. After supination exercise
Flexor carpi radialis	FCR	t	0.49	2.13	− 0.17	1.10	− 0.27	1.22
Flexor carpi ulnaris	FCU		0.09	1.42	− 0.14	1.11	− 0.70	1.21
Palmaris longus	PL		0.18	1.17	0.14	1.36	− 0.21	1.24
Flexor digitorum superficialis	FDS		0.12	1.51	0.09	1.22	− 0.49	1.35
Flexor digitorum profundus	FDP		0.13	1.33	− 0.20	1.07	− 0.59	1.26
Extensor carpi radialis longus/brevis	ECR		2.79*	1.24	1.35	1.09	− 0.10	1.09
Extensor carpi ulnaris	ECU		0.99	1.42	1.10	1.34	0.42	1.37
Extensor digitorum	ED		1.57	1.47	1.26	1.30	0.63	1.16
Supinator	SM	Agonist	6.55*	1.76	6.62*	1.84	5.86*	1.49
Pronator teres	PT		0.38	1.39	0.24	1.39	− 0.20	1.49

ISSN: 1880-6562