Shinsuke Sato, MD, PhD, Masazumi Mizuma, MD, PhD, Nobuyuki Kawate, MD, PhD,
Fumihito Kasai, MD, PhD, Shinichi Wada, MD
Jpn J Compr Rehabil Sci 3: 6-10, 2012
Purpose: The majority of studies investigating sit-tostand
(STS) motion have focused on the analysis of
motion in the sagittal plane. We conducted a study
using a pressure distribution measurement system
known as BIG-MAT (BM) to investigate the bilateral
asymmetry of STS.
Method: Ten healthy men were asked perform STS
movements while paying attention to their bilateral
symmetry. We recorded the plantar pressure changes
for both feet over the course of 15 rounds of STS.
Based on the pressure sensitivity diagram obtained
from the BM analysis, time-dependent changes in
peak load pressure for both the left and right forefoot
and hindfoot were evaluated.
Results: Temporal bilateral differences in forefoot
peak load were below 0.2 s in 50.3 ± 12.8% of subjects,
more than 0.2 s in 45.0 ± 14.1% of subjects, and the
peak itself was absent in in 4.0 ± 0.5% of subjects.
Conclusion: Despite subjects attempting to remain
aware of bilateral symmetry during STS movement,
approximately 50% of STS motions were asymmetric.
This study suggested the involvement of movements
of the trunk, such as small rotations, lateral bendings,
and lateral movements.
Key words: sit-to-stand motion, pressure distribution measurement system, trunk sway, motion analysis, BIG-MAT