NDLI: Non-contact muscle sound sensing by laser displacement meter and development of a wearable muscle sound recorder for daily life

Content Provider	IEEE Xplore Digital Library
Author	Inoue, T. Naemura, K. Hosaka, H. Itao, K.
Copyright Year	2000
Description	Author affiliation: Dept. of Precision Machinery Eng., Tokyo Univ., Japan (Inoue, T.)
Abstract	In order to develop a new wearable muscle sound recorder (WMSR), non-contact muscle sound (MS) sensing by a laser displacement meter (LDM) was conducted. MS of biceps brachii was recorded by LDM at 20, 50 and 80% MVC under isometric contraction. The frequency range (transformed from displacement dimension into acceleration by multiplying the angular frequency squared) was from 5 to 50 Hz. The effect of sensor mass was evaluated by putting weights on the accelerometer to change the total mass. The capacitance accelerometer weighed 2 grams, and additional weights were changed from 0 to 280 grams. In 6 healthy subjects aged 22.5 on average, a sensor mass of more than 10 grams attenuated the rate that components over 20 Hz occupied in the total spectrum. Thus, a contact sensor mass for biceps brachii should be below 10 grams. The developed WMSR attached to the subject's waist consisted of not only a MS sensor, but also ECG, piezo-resistive 3-axis accelerometers and a vibrating gyroscope (W 6.4 cm, H 4.7 cm and L 14 cm). A 9 V-alkali battery could operate the WMSR for around 3.9 hours. The WMSR enabled the authors to measure MS outdoors. The S/N ratio was about 10 dB in performance evaluation, which indicated that the MS was recorded adequately. Furthermore, the S/N ratio was measured under some daily life situations; sitting, walking, muscle training, and getting on a train. Conclusions are follows; 1) compared with a non-contact sensor a contact sensor mass of more than 10 grams weakened frequency components higher than 20 Hz; 2) WMSR enabled the authors to measure MS outdoors, even when getting on a train.
Starting Page	43
Ending Page	46
File Size	314909
Page Count	4
File Format	PDF
ISBN	0780364651
ISSN	1094687X
DOI	10.1109/IEMBS.2000.900663
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-07-23
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Muscles Frequency Accelerometers Battery charge measurement Acceleration Capacitance Aging Electrocardiography Gyroscopes Legged locomotion
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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