Accession Number : ADB253038


Title :   A Spine Loading Model of Women in the Military


Descriptive Note : Annual rept. 25 Sep 1998-24 Sep 1999


Corporate Author : OHIO STATE UNIV COLUMBUS


Personal Author(s) : Marras, William


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/b253038.pdf


Report Date : Oct 1999


Pagination or Media Count : 186


Abstract : The risk of low-back disorders (LBD) may be particularly great for women in the military, influencing training, effectiveness, costs, and military readiness. The goal of this research is to quantify musculoskeletal loads on the spine of women performing military manual materials handling (MMH) tasks. This will permit assessment of LBD risk factors for military women, and the potential to evaluate tasks and training methods for female military personnel. Our efforts are progressing in general accordance with the proposal and timeline. Magnetic resonance images have been employed with knowledge of muscle fiber orientation to estimate and predict the physiological cross-sectional areas, as well as the moment-arms and vector locations for the muscle lines-of-action for both females and males. Muscle force-velocity and length-strength relationships have been developed for females and males, and a systematic approach was used to develop and select a biomechanical model for the females and males for further evaluation. Validation of the biomechanical models using the inputs from MRI, muscle fiber orientation and length-strength and force-velocity modulation factors have been performed, which indicated that the female specific biomechanical model resulted in very acceptable model performance evaluation parameters. Comparisons between male and female predicted spinal loading indicated that for most task parameters studied, spinal loading was similar between males and females. However, when taking into account spinal tolerance differences between males and females, females were much closer to their spinal compression tolerance levels than males, indicating that females would be at greater risk for injury to the low back than males for similar task demands. After the fourth year of this research effort, we are progressing well and are confident than an accurate biomechanical model can be developed for the evaluation of spinal loading of women performing military MMH tasks.c


Descriptors :   *MUSCULOSKELETAL SYSTEM , *SPINAL COLUMN , MILITARY PERSONNEL , MODELS , LOADS(FORCES) , MAGNETIC RESONANCE , MANUAL OPERATION , MALES , MUSCLES , WOMEN , BIOMECHANICS , TOLERANCES(PHYSIOLOGY) , FEMALES , MATERIALS HANDLING


Subject Categories : Anatomy and Physiology
      Medicine and Medical Research
      Stress Physiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE