Attenuation of spinal transients at heel strike using viscoelastic heel insoles: an in vivo study

Preventive Medicine
Yoram FolmanReuven Gepstein

Abstract

The transients introduced at heel strikes were linked with increased risk for low back pain. The present study was designed to monitor the transients acting on the spinal column at gait, and to find out whether said transients are attenuated by interposition of a viscoelastic heel insoles. A lightweight (2 g) accelerometer was held against the forehead with an elastic strap. The subject was instructed to walk naturally along an 8-m rigid walkway with a built-in, high-frequency (<500 Hz) response Kistler force plate. Seven subjects, shod in leather-soled shoes, were studied sequentially without and with viscoelastic heel insoles (Viscoheel, Bauerfeind). Ground reaction force and vertical acceleration were simultaneously recorded. The data were analog-stored and analyzed with respect to time and frequency domains. Under the aforementioned conditions, the heel strike introduced a transient that averaged 60% of body weight and lasted for up to 5 ms. Maximal deceleration was recorded in the order of 5G, with a frequency spectrum of 100 Hz. Interposition of silicone heel insoles attenuated the ground reaction force by one third and deceleration by two thirds, the highest frequency components having been eliminated. Viscoelastic heel ...Continue Reading

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Citations

Dec 9, 2008·The Medical Clinics of North America·K Douglas Gross, Howard Hillstrom
Aug 9, 2008·Rheumatic Diseases Clinics of North America·K Douglas Gross, Howard J Hillstrom
Jan 8, 2008·Gait & Posture·Justin J Kavanagh, Hylton B Menz
Aug 12, 2010·Clinics in Geriatric Medicine·K Douglas Gross
Jul 21, 2011·Ergonomics·Mark W CreabyKim L Bennell
Jul 3, 2007·Journal of Applied Biomechanics·Hung-Ta Chiu, Tzyy-Yuang Shiang

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