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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.
|Keywords: ||Ulnar deviation|
Maximum acceptable torque
|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/|
|Appears in Collections:||Conference Papers|
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