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Human response to soft tissue impact

Khaled Ali Alkhaledi, University of Nebraska - Lincoln


This was an exploratory study aimed at measuring the relationships among various Psychophysical ratings of force impacts, tissue temperature outcomes, and tissue deformation as a result of the Energy of impact, Velocity of the impact, the size of the impacting object, Acceleration, and the Force of the impact. ^ Ten volunteers were exposed to a pendulum directed impact to the deltoid area of the arm. The impacts involved three levels of Energy, three levels of Velocity, and three sizes of impacting object (Ball Size) resulting in twenty seven impact treatments to each subject during 14 experimental sessions. Subjects were asked to give a Psychophysical rating after each impact. The pendulum was instrumented to measure Force and Acceleration and was controlled to a desired Energy and Velocity level, by adjusting the mass and height of the starting point. The personal characteristics factors of Age, Gender, Skin-Fold Thickness, deltoid Muscle Thickness, and Bone Thickness were collected and included in the analysis. ^ The dependent measures were the Psychophysical ratings, the maximum temperature change in the impacted area, the area of the impact, and the Deformation of the tissue after 0.01 seconds. This study found that the pendulum Energy was the most important variable associated with the Psychophysical ratings, Temperature Differences, Impact Area, and Deformation. Velocity and Ball Size were also important but to a lesser degree. Each subject personal characteristics were associated with the perception of impact severity. Additionally, the dependent measures were correlated with the measures of Acceleration and Force. ^

Subject Area

Health Sciences, Occupational Health and Safety|Engineering, Industrial|Biophysics, Biomechanics

Recommended Citation

Alkhaledi, Khaled Ali, "Human response to soft tissue impact" (2010). ETD collection for University of Nebraska - Lincoln. AAI3409310.