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Related Experiment Videos

Trunk position sense in the frontal plane.

T Jakobs, J A Miller, A B Schultz

    Experimental Neurology
    |October 1, 1985
    PubMed
    Summary

    Healthy adults can precisely sense their upper spine

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    Area of Science:

    • Human motor control
    • Proprioception
    • Spinal biomechanics

    Background:

    • Accurate proprioception is crucial for maintaining posture and balance.
    • The ability to sense the position of the thoracic spine (T1 level) is not well understood.
    • Understanding thoracic spine proprioception can inform rehabilitation strategies.

    Purpose of the Study:

    • To quantify the accuracy of sensing the lateral position of the T1 spinal level.
    • To investigate factors influencing thoracic spine position sense, including voluntary muscle activation and pelvic positioning.
    • To determine if sex or athletic background affects T1 position accuracy.

    Main Methods:

    • Twenty healthy young adults (18-25 years) participated.
    • Participants' ability to identify the midline of the T1 spinal level was tested under various conditions (standing, supine, with/without muscle contraction, with pelvic tilt/trunk moment).
    • Vision was occluded, and the pelvis was immobilized.

    Main Results:

    • Participants could sense the T1 midline position within 3 mm in standing and 9 mm in supine tests.
    • Active self-centering or trunk muscle contraction did not improve positioning accuracy.
    • Lateral pelvic tilt and trunk moments caused predictable trunk offsets but did not significantly impair accuracy.

    Conclusions:

    • Healthy young adults possess a high degree of accuracy in sensing the lateral position of their upper thoracic spine.
    • Active trunk muscle engagement and common postural variations do not enhance this specific proprioceptive ability.
    • Thoracic spine position sense is robust and not significantly influenced by sex or gymnastics experience.

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