Walking motions with high margin-of-stability values

Many researchers studied on gait parameters, such as step width and speed, correlated with gait stability indices. In contrast, to understand stable gait motions against fall, we computed the time-series of joint angles that are correlated with a popular kinetic gait stability index: margin of stability (MoS). A time-series extension of the partial least square regression was applied on the joint angles to construct the principal motions, i.e., motion elements included in gait motions. These principal motions were linearly independent of each other and correlated with MoS. The linear combination of three principal motions produced a quantity that was correlated with the minimal MoS values having a coefficient of 0.87. Interpretation of the obtained principal motions suggests that the stable gait is of the small takeoff and step lengths.

[1]  Joseph Hamill,et al.  Stability and variability may respond differently to changes in walking speed. , 2005, Human movement science.

[2]  A L Hof,et al.  The condition for dynamic stability. , 2005, Journal of biomechanics.

[3]  Y. Pai,et al.  Center of mass velocity-position predictions for balance control. , 1997, Journal of biomechanics.

[4]  S. Wold,et al.  PLS-regression: a basic tool of chemometrics , 2001 .

[5]  R. Newton,et al.  Relationship between balance and gait stability in healthy older adults. , 2004, Journal of aging and physical activity.

[6]  Jeffrey M. Hausdorff.  Gait variability: methods, modeling and meaning , 2005, Journal of NeuroEngineering and Rehabilitation.

[7]  P. Beek,et al.  Is slow walking more stable? , 2009, Journal of biomechanics.

[8]  S. Okamoto,et al.  Experimental analysis of the fall mitigation motion caused by tripping based on the motion observation until shortly before ground contact , 2019, Journal of Biomechanical Science and Engineering.

[9]  Yasuhiro Akiyama,et al.  Principal Motion Ellipsoids: Gait Variability Index Invariant With Gait Speed , 2020, IEEE Access.

[10]  Jonathan B Dingwell,et al.  Dynamic margins of stability during human walking in destabilizing environments. , 2012, Journal of biomechanics.

[11]  T. M. Owings,et al.  Variability of step kinematics in young and older adults. , 2004, Gait & posture.

[12]  Scott A. England,et al.  The influence of gait speed on local dynamic stability of walking. , 2007, Gait & posture.

[13]  Deborah D. Espy,et al.  Control of center of mass motion state through cuing and decoupling of spontaneous gait parameters in level walking. , 2010, Journal of biomechanics.

[14]  J. Dingwell,et al.  Kinematic variability and local dynamic stability of upper body motions when walking at different speeds. , 2006, Journal of biomechanics.

[15]  R. Newton,et al.  ASSOCIATION OF BALANCE MEASURES AND PERCEPTION OF FALL RISK ON GAIT SPEED: A MULTIPLE REGRESSION ANALYSIS , 2005, Experimental aging research.

[16]  Yasuhiro Akiyama,et al.  Kinematic gait stability index highly correlated with the margin of stability: Concept and interim report , 2021, 2021 IEEE/SICE International Symposium on System Integration (SII).

[17]  Yasuhiro Akiyama,et al.  Effects of exoskeletal gait assistance on the recovery motion following tripping , 2020, PloS one.

[18]  T Bhatt,et al.  Independent influence of gait speed and step length on stability and fall risk. , 2010, Gait & posture.

[19]  A. Hof.  The 'extrapolated center of mass' concept suggests a simple control of balance in walking. , 2008, Human movement science.