Overhead support systems differentially affect gait analysis of overground and treadmill walking

Area of Science:

• Biomechanics
• Gait Analysis
• Human Movement Science

Background:

• Overhead support systems are crucial for safety in clinical gait studies.
• These systems are assumed to be non-intrusive, remaining slack during upright stance.
• However, their interaction with transverse motion may introduce confounding forces.

Purpose of the Study:

• To quantify the impact of overhead support systems on gait biomechanics.
• To compare these effects during both treadmill and overground walking conditions.
• To assess the influence of varying walking speeds on these biomechanical alterations.

Main Methods:

• Fifteen healthy adults participated in treadmill and overground walking trials.
• Walking speeds were set at 80%, 100%, and 120% of preferred.
• Three-dimensional motion capture and an instrumented treadmill recorded joint angles, moments, and ground reaction forces.

Main Results:

• Overground walking showed significant alterations in ground reaction forces, joint kinematics, and moments, amplified by increased speed.
• Treadmill walking exhibited minimal changes in gait biomechanics due to the overhead support system.
• Statistical parametric mapping (spm1d) was used to analyze biomechanical variables.

Conclusions:

• The use of overhead support systems during overground walking requires caution, particularly at higher speeds.
• These findings may be less relevant for clinical populations walking at slower speeds.
• Overhead support systems appear safe for use in treadmill-based gait research without compromising data integrity.