Stride length asymmetry in split-belt locomotion.

Area of Science:

• Biomechanics
• Human locomotion
• Motor control

Background:

• Split-belt treadmill use is increasing, leading to inconsistent gait parameter reporting.
• Existing definitions of gait parameters may not accurately reflect split-belt treadmill conditions.
• Lack of standardized definitions hinders comparability across studies.

Purpose of the Study:

• To clarify definitions of commonly used gait parameters in split-belt treadmill research.
• To propose standardized terminology for split-belt gait analysis.
• To address the specific symmetry measures of stride length and stride time.

Main Methods:

• Literature review of split-belt treadmill studies.
• Analysis of gait parameter definitions and their application.
• Conceptual clarification of stride length in split-belt conditions.

Main Results:

• The standard definition of stride length is insufficient for split-belt treadmill studies.
• A modified measure, representing limb excursion, is frequently reported but mislabeled.
• Symmetry of stride length and stride time requires specific consideration in split-belt paradigms.

Conclusions:

• Recommend using 'limb excursion' instead of 'stride length' for split-belt gait.
• Standardized definitions are crucial for accurate interpretation of split-belt treadmill data.
• Clearer terminology will improve the reproducibility and comparability of gait research.