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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. |
| E-mail: | 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://hdl.handle.net/123456789/21424 |
| ISBN: | 978-145771989-9 |
| Appears in Collections: | Conference Papers
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