Associations of Lumbar Anterior Trunk Flexion with 10-m Walk Speed, Timed Up-and-Go, and Falls in Parkinson’s Disease: A Cross-sectional Study
4 affiliations
- 1Department of Physical Rehabilitation, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
- 2Department of Informatics, Graduate School of Informatics and Engineering, The University of Electro-Communications, Tokyo, Japan
- 3Department of Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
- 4Department of Rehabilitation Medicine, Jikei University School of Medicine, Tokyo, Japan
Abstract
Objectives:: This study examined associations between lumbar anterior trunk flexion (ATF) and mobility outcomes in Parkinson’s disease (PD).
Methods:: We conducted a cross-sectional study of 50 participants with PD. ATF was measured in relaxed standing (static ATF) and during maximal trunk extension; postural reversibility (ΔATF) was defined as static minus extended ATF. Outcomes included 10-m walk speed and Timed Up-and-Go (TUG) test result; TUG time was also natural log-transformed (lnTUG). Associations were assessed using correlations and covariate-adjusted linear regression models. Twelve-month fall history was analyzed using logistic regression.
Results:: The statistical significance of the static ATF–lnTUG association was sensitive to exclusion of one potentially influential observation (all participants with lnTUG data: n = 42, standardized β = 0.278, P = 0.060; after exclusion: n = 41, ΔR2 = 0.113, P = 0.010; standardized β = 0.36, P = 0.010). ΔATF did not improve model fit (P = 0.985). Neither static ATF nor ΔATF was associated with 10-m walk speed in the complete-case multivariable model (n = 34). Fall history was available for 42 participants (8 missing); the static ATF–fall history association did not reach statistical significance (odds ratio: 1.047 per 1° increase, 95% confidence interval: 0.998–1.098; P = 0.061).
Conclusions:: Greater static ATF tended to be associated with longer lnTUG but not with 10-m walk speed; the lnTUG finding was sensitive to exclusion of one potentially influential observation. ΔATF showed limited incremental explanatory value beyond static ATF and remained an exploratory measure of postural reversibility.
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BibTeX
@article{kato2026associations,
title = {{Associations of Lumbar Anterior Trunk Flexion with 10-m Walk Speed, Timed Up-and-Go, and Falls in Parkinson’s Disease: A Cross-sectional Study}},
author = {Taro Kato and Ippei Suzuki and Miku Sato and Yuta Miyazaki and Kazuyuki Mito and Yohei Mukai and Takatoshi Hara},
journal = {Progress in Rehabilitation Medicine},
year = {2026},
month = oct,
doi = {10.2490/prm.20260062},
url = {https://doi.org/10.2490/prm.20260062},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Associations of Lumbar Anterior Trunk Flexion with 10-m Walk Speed, Timed Up-and-Go, and Falls in Parkinson’s Disease: A Cross-sectional Study
AU - Taro Kato
AU - Ippei Suzuki
AU - Miku Sato
AU - Yuta Miyazaki
AU - Kazuyuki Mito
AU - Yohei Mukai
AU - Takatoshi Hara
PY - 2026
DA - 2026/10/31
JO - Progress in Rehabilitation Medicine
DO - 10.2490/prm.20260062
UR - https://doi.org/10.2490/prm.20260062
AB - Objectives:: This study examined associations between lumbar anterior trunk flexion (ATF) and mobility outcomes in Parkinson’s disease (PD). Methods:: We conducted a cross-sectional study of 50 participants with PD. ATF was measured in relaxed standing (static ATF) and during maximal trunk extension; postural reversibility (ΔATF) was defined as static minus extended ATF. Outcomes included 10-m walk speed and Timed Up-and-Go (TUG) test result; TUG time was also natural log-transformed (lnTUG). Associations were assessed using correlations and covariate-adjusted linear regression models. Twelve-month fall history was analyzed using logistic regression. Results:: The statistical significance of the static ATF–lnTUG association was sensitive to exclusion of one potentially influential observation (all participants with lnTUG data: n = 42, standardized β = 0.278, P = 0.060; after exclusion: n = 41, ΔR2 = 0.113, P = 0.010; standardized β = 0.36, P = 0.010). ΔATF did not improve model fit (P = 0.985). Neither static ATF nor ΔATF was associated with 10-m walk speed in the complete-case multivariable model (n = 34). Fall history was available for 42 participants (8 missing); the static ATF–fall history association did not reach statistical significance (odds ratio: 1.047 per 1° increase, 95% confidence interval: 0.998–1.098; P = 0.061). Conclusions:: Greater static ATF tended to be associated with longer lnTUG but not with 10-m walk speed; the lnTUG finding was sensitive to exclusion of one potentially influential observation. ΔATF showed limited incremental explanatory value beyond static ATF and remained an exploratory measure of postural reversibility.
SN - 2432-1354
ER -