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Related Experiment Videos

Trunk kinematics during locomotor activities.

D E Krebs1, D Wong, D Jevsevar

  • 1MGH Institute of Health Professions, Boston, MA 02108-3402.

Physical Therapy
|July 1, 1992
PubMed
Summary

Trunk motion during daily activities like walking and climbing stairs varies significantly. Understanding upper-body kinematics relative to the pelvis and gravity is crucial for locomotor control, especially in patients with disabilities.

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Area of Science:

  • Biomechanics
  • Human Movement Analysis
  • Kinesiology

Background:

  • Understanding upper-body (trunk) angular kinematics is essential for analyzing human locomotion.
  • Previous research has primarily focused on trunk motion relative to the pelvis, with less emphasis on its relationship to the environment (room coordinates).

Purpose of the Study:

  • To investigate upper-body angular kinematics during common daily activities: gait, stair climbing/descending, and rising from a chair.
  • To compare trunk motion in two reference frames: relative to the pelvis and relative to room coordinates.

Main Methods:

  • Bilateral kinematic data were collected from 11 healthy adults (aged 27-88 years).
  • Analysis focused on trunk angular motion (flexion/extension, abduction/adduction, medial/lateral rotation) in sagittal, frontal, and transverse planes.

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  • Motions were assessed relative to both the pelvis and room-fixed coordinates.

    • Main Results:

    • Stair climbing involved the greatest trunk flexion relative to the room, exceeding that of stair descending and gait.
    • Rising from a chair required the largest trunk flexion/extension range of motion (ROM) but minimal rotation.
    • Trunk ROM relative to the room was consistently greater during stair negotiation than during gait.
    • Trunk and pelvic rotation were more synchronized during stair descending than during gait.
    • Trunk ROM relative to the pelvis was greater than relative to room coordinates across all activities, suggesting coordinated trunk-pelvis movement to stabilize the body.

    Conclusions:

    • Upper-body kinematics, considered in relation to both the pelvis and gravity, are vital for effective locomotor control.
    • The coordination between the trunk and pelvis appears to play a role in minimizing destabilizing movements during daily activities.
    • Future research on individuals with locomotor impairments should incorporate analysis of upper-body kinematics in both reference frames.