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Some physiological responses to static grip.
Department of Industrial and Operations Engineering, College of Engineering, The University of Michigan, Ann Arbor, Michigan, 1974 Dec; :1-83
As part of a joint project concerned with the various physiological and biomechanical aspects of hand activities with the final goal of reducing the number and severity of injuries to the hand, the relationships of some physiological parameters to exertion level and fatigue were studied. Four men were tested on two occasions. The exertion levels for static grip were 10, 20, 30, 50, and 75 percent of each subject's maximum voluntary contraction (MVC) strength. Electrocardiogram findings, blood pressure, forearm blood flow rate, and the electromyographical activity of the finger flexor muscles were recorded. Normalized heart rate increased linearly with exertion levels and these increases were significant at all levels except the 10 percent MVC. Normalized mean arterial blood pressure increased linearly and significantly with exertion levels. The normalized blood flow increased linearly to about 13 percent of each person's MVC strength, decreasing linearly above that level of exertion. Normalized vascular resistance to blood flow decreased linearly to about 17 percent MVC and increased linearly thereafter. Decreases were significant from 10 to 30 percent MVC. The strain gauge plethysmography proved to be reliable and accurate as a noninvasive blood flow analysis tool.
NIOSH-Grant; Grants-other; Physical-exercise; Cardiovascular-system; Heart-rate; Hand-injuries; Biomechanics
Industrial Engineering University of Michigan 2260 G G Brown University Ann Arbor, Mich 48105
Final Grant Report
NTIS Accession No.
Other Occupational Concerns; Grants-other
Department of Industrial and Operations Engineering, College of Engineering, The University of Michigan, Ann Arbor, Michigan
University of Michigan, Ann Arbor, Michigan
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division