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Changes in Segmental Mass and Inertia During Pregnancy: A Musculoskeletal Model of the Pregnant Woman



Details

  • Personal Author:
  • Description:
    Background: One in four pregnant women falls at least once during her pregnancy. During pregnancy, the body undergoes tremendous vascular, hormonal, physiological, and psychological changes to accommodate the growing fetus. The pregnancy-induced mass gain of 10 to 25 kg is not evenly distributed and results in a large change in mass distribution and shift in segmental centers of mass. To accurately understand how the change in mass distribution leads to an increase in fall events, a musculoskeletal model of the pregnant body is necessary. Generic musculoskeletal models cannot accurately represent the morphology of pregnant women and the study of postural stability of pregnant women is limited by the lack of adapted musculoskeletal models. Research question: Could a model reflecting the change in segmental inertia during pregnancy explain the pregnancy-related risk of falling? Methods: We built a musculoskeletal model of the pregnant women, combining literature anthropomorphic measurements with generic models. We optimized the dimensions of the anthropomorphic model shapes to fit the average measurements of 25 pregnant women. The mass, center of mass, and inertia of each segment are then computed throughout pregnancy. Finally, the stance phase of a gait cycle was modeled using the pregnancy-specific and the generic models. The ankle, knee, hip and lumbar joint moments during gait were compared between the two models. Results: The built musculoskeletal model of the pregnant woman includes changes in mass and geometry of the thorax, pelvis, thighs, and legs. The model reproduces the change in lumbar curvature during pregnancy. Gait simulation results show a limited impact of pregnancy on the ankle, knee, and hip moment, but a large impact on the lumbar moment. Significance: Such a musculoskeletal model will help elucidate the mechanisms leading to falls or low back pain during pregnancy. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0966-6362
  • Document Type:
    Text
  • Funding:
    Grant
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Pages in Document:
    389-395
  • Volume:
    76
  • NIOSHTIC Number:
    nn:20059136
  • Citation:
    Gait Posture 2020 Feb; 76:389-395
  • Contact Point Address:
    A. Azoug, Oklahoma State University, School of Mechanical and Aerospace Engineering, 201 General Academic Building, Stillwater, OK 74078, United States
  • Email:
    azoug@okstate.edu
  • Federal Fiscal Year:
    2020
  • Performing Organization:
    University of Texas Health Science Center, Houston
  • Peer Reviewed:
    True
  • Start Date:
    20050701
  • Source Full Name:
    Gait and Posture
  • End Date:
    20250630
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:307b4e0a7b563d1ecc59497497d11329d5b37d8cfbf189c8b5f190ffe0eaeb2354d70d02cd0ddf5b91b233cbdf3c72374a78c7224355768921353b3ae4d3250b
  • Download URL:
  • File Type:
    Filetype[PDF - 1.23 MB ]
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