Title :
Forearm stimulation by a magnetic stimulator with repetitive frequency ability of up to 50 Hz
Author :
Yarita, Masaru ; Hosoya, Tsuguharu ; Ito, Fakafumi ; Nonaka, Yukio ; Ueno, Shoogo
Author_Institution :
Nihon Kohden Tomioka Corp., Japan
Abstract :
A repetitive magnetic stimulator of up to 50 Hz was developed. Ten subjects forearms were stimulated at 3-50 Hz and wrist bend angle was measured. We found 6 Hz or lower stimulation elicited clear thumb twitches whereas 10 Hz or higher elicited a continuous wrist bend. Twitch to continuous tonus transition was observed between 6-10 Hz. The wrist bend angle increment rate was at approximately 7°/Hz in 3-5 Hz stimulation and 6-40 Hz was 1-2°/Hz. The maximum wrist bend angle was 86° at 0.16 T, 50 Hz, 200 μs duration, biphasic magnetic stimuli. These results suggest useful applications of repetitive magnetic stimuli in rehabilitation as well as orthopedics, pulmonology and urology
Keywords :
biological effects of fields; biomagnetism; biomedical equipment; electromyography; feedforward; muscle; neurophysiology; patient treatment; 0.16 T; 200 mus; 3 to 50 Hz; EMG; biphasic magnetic stimuli; clear thumb twitches; continuous wrist bend; feedback type voltage trimmer; feedforward type charger; forearm stimulation; magnetic stimulator; orthopedics; pulmonology; rehabilitation; repetitive frequency ability; twitch to continuous tonus transition; urology; wrist bend angle; Capacitors; Coils; Electromyography; Frequency; Magnetic flux; Magnetic stimulation; Orthopedic surgery; Thumb; Thyristors; Wrist;
Conference_Titel :
Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference
Conference_Location :
Montreal, Que.
Print_ISBN :
0-7803-2475-7
DOI :
10.1109/IEMBS.1995.579552
