AI Insight
This study analyzed gait patterns in 78 community-dwelling stroke survivors with hemiparesis by examining the relationship between center of pressure, center of mass dynamics, and ground reaction forces during walking. Researchers found that insufficient forward progression of the center of mass relative to the center of pressure during late stance strongly correlated with late braking force, and identified four distinct candidate gait subgroups with different combinations of movement control patterns. The data-driven clustering approach revealed heterogeneity in post-stroke walking disorders that may be obscured when treating all hemiparetic patients as a single group.
Why it matters
Understanding distinct gait subgroups in stroke survivors could lead to more personalized rehabilitation strategies rather than one-size-fits-all approaches. The strong correlations between specific movement patterns and ground reaction forces may help clinicians identify targeted interventions to improve walking function and reduce fall risk in stroke patients.
Understand the Science
by Kimihiko Mori, Tatsuya Teramae, Masanori Wakida, Naoto Mano, Yuta Chujo, Takayuki Kuwabara, Meguru Taguchi, Kimitaka Hase, Tomoyuki Noda
Introduction
Hemiparetic gait is characterized by abnormal ground reaction forces (GRFs) with impaired control of the center of mass (CoM) relative to the center of pressure (CoP). Although both anteroposterior and mediolateral gait control have been examined separately, how their integrated stance-phase–derived CoP–CoM interactions and local CoP-based features relate to GRF characteristics remains unclear.
Objective
This exploratory study aimed to explore the relationships between CoP–CoM and CoP-based dynamics and GRFs and descriptively identify candidate gait subgroups of individuals with poststroke hemiparesis using a data-driven clustering approach.
Methods
Seventy-eight community-dwelling individuals with poststroke hemiparesis participated in a three-dimensional gait analysis. Stance-phase–derived CoP–CoM parameters of the transverse plane and local CoP-based loading metrics were extracted during the paretic stance phase. Relationships between these gait metrics and GRFs, particularly early braking force, propulsion, and late braking force, were examined using nonparametric correlation analyses. K-means clustering was performed to explore candidate gait subgroups, and inter-cluster differences were exploratorily examined.
Results
Across all participants, several CoP–CoM interaction metrics showed significant correlations with GRFs. In particular, insufficient forward progression of the CoM relative to the CoP during late stance showed a strong correlation with late braking force (rs = 0.79). Clustering suggested the presence of four candidate gait subgroups characterized by differing combinations of anteroposterior and mediolateral CoP–CoM dynamics and local CoP loading features. However, the results of clusters with small sample sizes warrant cautious interpretation.
Conclusions
Integrated stance-phase–derived CoP–CoM dynamics and CoP-based parameters may highlight heterogeneity in hemiparetic gait and may have meaningful associations with GRF characteristics. The candidate gait subgroups should be interpreted as hypothesis-generating and may offer a descriptive framework for understanding diverse gait disorders.