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Mohamad Parnianpour

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Publications by Mohamad Parnianpour (bibliography)

1995

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Sommerich, Carolyn M., Marras, William S. and Parnianpour, Mohamad (1995): Activity of Index Finger Muscles during Typing. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 620-624.

“An electromyographic investigation was conducted of finger and wrist muscle activity during typing. Examination of the data revealed substantial activity of the extrinsic extensor, a muscle which is ignored in many existing biomechanical finger models. This paper describes activity of the extensor muscle during typing, in absolute terms and relative to activity of the extrinsic flexors. Amplitude probability distribution analyses demonstrated that static extensor activity exceeded 5% MVC for all subjects. Two subjects exhibited pronounced patterns of coactivity in the extrinsic extensor and flexor muscles. Biomechanical modeling efforts demonstrated similar force contributions from the extrinsic extensors and flexors. Based on these results, neglect of finger extensor activity would result in underestimation of finger joint loading.”

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Kim, Jung-Yong, Parnianpour, Mohamad and Marras, William S. (1995): Development of Experimental Protocol to Quantitatively Assess the Neuromuscular Control Capability of Low-Back Pain Patients. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 754-758.

“An experimental protocol was developed in this study in order to quantify the control capability of the trunk movement for LBP patients. Fitts' law (1954) was employed to measure the dynamic performance parameters such as flexion/extension velocity and acceleration with controlled ROM and the information processing capacity (bits/second) of the trunk. A series of statistical analyses were performed to reduce the length of protocol for clinical application; 11 indices of difficulty (ID=log{sub:2}(2A/W), A: ROM, W: target tolerance) used by Kim et al. (1993, 1994) were shortened into 3 ID conditions. The accuracy of the protocol was validated by comparing those two conditions: 3 IDs and 11 IDs. This clinical protocol was also adjusted to test patients with ROM from 20 degrees to 40 degrees and above. This final short experimental protocol can be used to evaluate the neuromuscular performance of LBP patients with a minimal discomfort.”

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