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Polyurethane Replacement Insoles and Tibial Impact Acceleration Characteristics

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Abstract (2. Language): 
The impact accelerations associated with heel strike in gait have been advanced as possible causes of injury. This study examined the effectiveness of a commercial pair of polyurethane replacement insoles with respect to attenuating the accelerations experienced during heel strike. Active male subjects (n=10) age 20-30 years were instrumented with a lightweight accelerometer affixed to the distal medial aspect of the tibia. The subjects walked and ran on a motorized treadmill at 1.34, 2.68, and 3.58 m/s for the following conditions: barefoot (BF), barefoot with insole (BFI), running shoe with original insole (S), and running shoe with replacement insole (SI). Acceleration data were collected for 10 heel strikes at each of the four conditions for three treadmill speeds. Data were smoothed with a Fourier filter utilizing spectral analysis to determine appropriate cut-off frequencies. Repeated measures ANOVA revealed differences between peak impact accelerations for BF & S (p<0.05) as well as BF & SI (p<0.05) at each running speed. Additionally, differences in rise rate (RR) were observed between BF and all other conditions (p<0.05) at each running speed. In shod conditions, the shoe seems to be the primary determiner of impact characteristics and replacement insoles had little effect on tibial accelerations
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1.34 2.68 3.58
ACCELARTION (g's)
TREADMILL SPEED (m/s)
TIBIAL ACCELERATIONS
BF
BFI
S
SI
International Journal of Science and Engineering Investigations, Volume 1, Issue 9, October 2012 77
www.IJSEI.com Paper ISSN: 2251-8843 ID: 10912-16
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Mark DeBeliso, PhD is an Associate Professor and Graduate Program Director of the Masters of Science in Sport Conditioning and Performance at Southern Utah University, USA. His research interests include mechanics and metabolics of sport movements and work tasks, strength training for all walks of life, orthopedic biomechanics, and masters athletes.
John W. McChesney, PhD is an Associate Professor in the Department of Kinesiology at Boise State University, Idaho, USA. His research interests include the somatosensory contributions to motor performance and orthopedic rehabilitation.
Trish Sevene, PhD is an Assistant Professor in the Kinesiology Department at California State University Monterey Bay, California, USA. Her research interests include the biological basis of human performance and aging, work-related lifting tasks, and masters athletes.
Kent J. Adams, PhD is a Professor and Chair of the Kinesiology Department at California State University Monterey Bay, California, USA. His research interests include strength and power training across the lifespan, work-related lifting tasks, and masters athletes.
Chad Harris, PhD is a Professor and Chair of the Exercise Science Department at LaGrange College, Georgia, USA. His research interests include training effects on power production, weightlifting biomechanics, senior strength training and metabolic responses to power training.

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