A comparison of lumbosacral loads during static and dynamic activities.
A biomechanical model to determine the loads at the lumbosacral joint was developed. This model was used to determine the lumbosacral loads during two specific activities--a stable standing posture representing a static activity, and a normal level walk representing a dynamic activity. This study involved ten healthy and young male subjects. The results obtained indicated that the lumbosacral loads during a stable standing posture was in the range of 0.82 to 1.18 times body-weight, with a mean of 1.03 (+/- 0.11) times body-weight. In comparison, during a normal level walk the lumbosacral loads were in the range between 1.41 and 2.07 times body-weight, with a mean of 1.61 (+/- 0.24) times body-weight. The walking speed of these subjects varied between 0.96 and 1.48 ms-1, with a mean of 1.25 (+ 0.18) ms-1. Results in this study indicated that there was a significant difference (p < 0.005) between the means of the lumbosacral loads of these two specified activities. An increase of 56.3% between means of the static to the dynamic case was observed.
Khoo
B C
BC
Department of Orthopaedic Surgery, National University of Singapore.
Goh
J C
JC
Lee
J M
JM
Bose
K
K
D000005:Abdomen / Q000502:physiology; D000328:Adult; D001696:Biomechanical Phenomena; D006801:Humans; D008159:Lumbar Vertebrae / Q000502:physiology*; D008161:Lumbosacral Region / Q000502:physiology; D008297:Male; D008954:Models, Biological; D009132:Muscles / Q000502:physiology; D011187:Posture / Q000502:physiology*; D012016:Reference Values; D012447:Sacrum / Q000502:physiology*; D012680:Sensitivity and Specificity; D016138:Walking / Q000502:physiology*