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Title: | Use of near-infrared spectroscopy in evaluating upper extremity muscle hemodynamics during an eight-hour exposure to repetitive hand-wrist motions |
Authors: | Maikala, Rammohan V. Ciriello, Vincent M. O'Brien, Niall V. Banks, Jacob J. Rivard, Amanda J. rammohan.maikala@libertymutual.com |
Keywords: | Ulnar deviation Maximum acceptable torque Near-infrared spectroscopy |
Issue Date: | 27-Feb-2012 |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Citation: | p. 508-512 |
Series/Report no.: | Proceedings of the International Conference on Biomedical Engineering (ICoBE 2012) |
Abstract: | We evaluated local hemodynamic responses simultaneously from flexor and extensor muscles in the forearm of 14 male workers while performing repetitive ulnar deviation task for 8 hours. First, a psychophysical approach was utilized to identify participants’ maximum acceptable torque (in Nm) at 15 and 25 repetitions per min (rpm). Second, while performing an ulnar deviation task repetitively for 8 hours at their psychophysically acceptable torque, Tissue Oxygenation Index (TOI) and Tissue Hemoglobin Index (THI) were collected. Workers exerted lower acceptable torque for the task with a repetition rate of 25 rpm as compared to 15 rpm (3.57 ± 2.7 versus 3.97 ± 2.5 Nm, P=0.014). When the TOI responses (representing muscle oxygen saturation) after each hour of effort were matched for the net acceptable torque exerted, the mean TOI-torque ratio was 10.2% higher in the flexor region as compared to the extensor region throughout the workday. Also, when corrected for the torque exerted during both the 15 rpm and 25 rpm tasks, a dynamic adjustment of THI (representing muscle blood volume) to the time course of TOI resulted, suggesting a strong coupling between muscle blood flow and oxygen uptake as the task continued. Although the acceptable torque exerted was lowest for the 25 rpm task, the increased TOI-torque ratio coupled with increased THI per torque generated suggests that working at 25 rpm is metabolically more challenging than at 15 rpm. |
Description: | Link to publisher's homepage at http://ieeexplore.ieee.org/ |
URI: | http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6179070 http://dspace.unimap.edu.my/123456789/21424 |
ISBN: | 978-145771989-9 |
Appears in Collections: | Conference Papers |
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