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

Table 2 The Z values of T₂ in 10 forearm muscles before and after pronation 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	Synergist	− 0.16	1.04	0.06	1.2	− 0.54	0.94
Flexor carpi ulnaris	FCU		0.02	1.2	0.23	1.31	− 0.6	1.14
Palmaris longus	PL		0.16	1.08	0.26	1.3	− 0.34	0.96
Flexor digitorum superficialis	FDS		− 0.15	1.29	0.33	1.34	− 0.54	1.02
Flexor digitorum profundus	FDP		− 0.27	1.16	− 0.21	1.18	− 0.78	1.17
Extensor carpi radialis longus/brevis	ECR		0.09	1.12	− 0.13	1.16	− 0.85	0.85
Extensor carpi ulnaris	ECU		0.61	1.46	0.82	1.33	0.31	1.37
Extensor digitorum	ED		0.68	1.04	0.36	1.15	0.55	1.13
Supinator	SM		0.35	1.21	0.36	1.46	− 0.23	1.35
Pronator teres	PT	Agonist	− 0.31	1.21	0.03	1.24	− 0.4	1.29
b. After pronation exercise
Flexor carpi radialis	FCR	Synergist	2.39*	1.15	2.10*	1.43	0.77	1.03
Flexor carpi ulnaris	FCU		0.67	1.31	0.25	1.61	− 0.57	1.41
Palmaris longus	PL		0.75	1.44	1.63	1.73	0.02	1.03
Flexor digitorum superficialis	FDS		0.38	1.36	0.37	1.51	− 0.61	0.98
Flexor digitorum profundus	FDP		− 0.12	0.99	− 0.17	1.19	− 1	0.96
Extensor carpi radialis longus/brevis	ECR		0.82	1.22	0.82	1.21	− 0.02	0.98
Extensor carpi ulnaris	ECU		2.44*	1.76	2.39*	2.16	0.63	1.84
Extensor digitorum	ED		3.74*	1.69	2.06*	1.79	1.42	1.57
Supinator	SM		0.81	1.38	0.74	1.97	0.45	1.39
Pronator teres	PT	Agonist	5.02*	1.82	5.72*	1.59	4.18*	1.36

ISSN: 1880-6562