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Activities of human upper limb muscles during a combined
movement of elbow flexion/extension and forearm pronation/
supination
Makoto Naganuma 1 , Wataru Hashizume 1 , Katsuhiko Suzuki 2 , Toshiaki Sato 3 ,
Hiromi Fujii 3 , Akira Naito 1
1
Dept Anat, Yamagata Univ Sch Med, 2 Dept PT, Yamagata Pref Univ Health Sci,
3
Dept OT, Yamagata Pref Univ Health Sci
Facilitation and inhibition mediated by group I afferents among human upper
limb muscles have been studied. The former and latter must be active during,
respectively, cocontraction and reciprocal contraction of the muscles. This study
examined activities of the biceps brachii BB, pronator teres PT, extensor carpi
radialis ECR and ulnaris ECU, and flexor carpi radialis FCR and ulnaris
FCU during a combined movement of elbow flexion/extension EF/EE and
forearm pronation/supination FP/FS in ten normal men with electromyography.
During movements of EFFP/EEFS and EFFS/EEFP, BB and FCU group
BB showed parallel activities cocontraction increasing and decreasing and
PT, ECR, and ECU group PT those decreasing and increasing at the EEFS and
EFFS, and EFFP and EEFP phases, respectively. These fluctuations resulted
in reciprocal contraction between group BB and PT. The results suggest that the
facilitation between PT and ECR and the inhibition between BB and PT are active
during the movements. Findings of the contractions may indicate existence of
facilitation between PT and ECU, and ECR and ECU, and inhibition between PT
and FCU, ECR and FCU, and ECU and FCU.
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