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Segment lengths influence hill walking strategies.

Riley C Sheehan1, Jinger S Gottschall1

  • 1Department of Kinesiology The Pennsylvania State University 29 Recreation Building University Park, PA, 16802 USA.

Journal of Biomechanics
|June 28, 2014
PubMed
Summary
This summary is machine-generated.

Body segment lengths influence walking, especially on hills. Shorter individuals require more propulsion and stability, while longer segments correlate with specific muscle activities and joint movements during incline and decline walking.

Keywords:
AnthropometryEMGHeightKinematicsTreadmill

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Area of Science:

  • Biomechanics
  • Human locomotion
  • Anthropometry

Background:

  • Body segment lengths affect walking kinematics and muscle activity.
  • Taller individuals typically use longer, slower strides than shorter individuals at the same speed.
  • Previous research has primarily focused on level walking, leaving hill-walking strategies less understood.

Purpose of the Study:

  • To investigate the influence of body segment lengths on walking strategies during level and hill walking.
  • To test the hypothesis that longer segments lead to increased joint flexion/extension and specific muscle activation patterns.
  • To determine if anthropometric variability impacts hill walking adaptations.

Main Methods:

  • Twenty young adults with diverse heights walked at a constant speed on a treadmill at level, 6°, and 12° incline/decline.
  • Kinematic data (joint motion) and muscle activity (electromyography) were collected.
  • Linear regressions analyzed the relationship between segment lengths (height, leg, thigh, shank) and walking variables.

Main Results:

  • Walking patterns on level and hills aligned with previous studies, despite significant anthropometric variability.
  • Few walking variables correlated significantly with segment length during hill walking.
  • Taller individuals exhibited greater knee and ankle flexion during uphill walking.
  • Tibialis anterior and lateral gastrocnemius activity correlated with shank length.
  • Relative step length and muscle activity decreased with increasing segment length, particularly shank length.

Conclusions:

  • Body segment length has a limited direct correlation with many hill walking variables.
  • Shorter individuals appear to need greater propulsion and toe clearance for uphill walking.
  • Shorter individuals also require enhanced braking and stability during downhill walking.
  • Adaptations in walking strategy during inclines/declines are influenced by segment length, but not always as hypothesized.