TY - JOUR
T1 - Kinematics of center of mass and center of pressure predict friction requirement at shoe-floor interface during walking
AU - Yamaguchi, Takeshi
AU - Yano, Masaru
AU - Onodera, Hiroshi
AU - Hokkirigawa, Kazuo
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for Young Scientists (B) ( 22760110 ) from the Japan Society for the Promotion of Science (JSPS) . This study was also supported in part by Core Research for Evolutional Science and Technology (CREST) Program of Japan Science and Technology Agency (JST) . Conflicts of interest statement
PY - 2013/6
Y1 - 2013/6
N2 - We aimed to determine whether inclination angles of the line connecting the whole body center of mass (COM) to the center of pressure (COP) (COM-COP angle) help predict the required coefficient of friction (RCOF) in young adult males during the weight acceptance and push-off phases in transient movements such as turning, gait termination and initiation, and steady-state movements such as straight walking. Seventeen healthy young adult males were asked to (1) walk in a straight line, (2) turn 60° with either foot (step and spin turns), and (3) initiate and terminate walking on a dry level floor. Peak absolute values of the ratio between resultant horizontal and vertical ground reaction forces during the weight acceptance and push-off phases (RCOFh and RCOFt, respectively) were calculated. COM-COP angles θh and θt at the instant of RCOFh and RCOFt, respectively, were also calculated. Bivariate regression analysis demonstrated that the |θh| and |θt| tangents were significant predictors of RCOFh (R=0.878; R2=0.770; p<0.001) and RCOFt (R=0.918; R2=0.843; p<0.001), respectively. The results suggest that COM and COP kinematics (i.e., the COM-COP angle) serve as a predictor of friction requirement during the weight acceptance and push-off phases in steady-state movements such as straight walking and transient movements such as turning as well as gait termination and initiation.
AB - We aimed to determine whether inclination angles of the line connecting the whole body center of mass (COM) to the center of pressure (COP) (COM-COP angle) help predict the required coefficient of friction (RCOF) in young adult males during the weight acceptance and push-off phases in transient movements such as turning, gait termination and initiation, and steady-state movements such as straight walking. Seventeen healthy young adult males were asked to (1) walk in a straight line, (2) turn 60° with either foot (step and spin turns), and (3) initiate and terminate walking on a dry level floor. Peak absolute values of the ratio between resultant horizontal and vertical ground reaction forces during the weight acceptance and push-off phases (RCOFh and RCOFt, respectively) were calculated. COM-COP angles θh and θt at the instant of RCOFh and RCOFt, respectively, were also calculated. Bivariate regression analysis demonstrated that the |θh| and |θt| tangents were significant predictors of RCOFh (R=0.878; R2=0.770; p<0.001) and RCOFt (R=0.918; R2=0.843; p<0.001), respectively. The results suggest that COM and COP kinematics (i.e., the COM-COP angle) serve as a predictor of friction requirement during the weight acceptance and push-off phases in steady-state movements such as straight walking and transient movements such as turning as well as gait termination and initiation.
KW - Center of mass
KW - Center of pressure
KW - Required coefficient of friction
KW - Slips and falls
KW - Turn
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U2 - 10.1016/j.gaitpost.2012.11.007
DO - 10.1016/j.gaitpost.2012.11.007
M3 - Article
C2 - 23218767
AN - SCOPUS:84880041051
SN - 0966-6362
VL - 38
SP - 209
EP - 214
JO - Gait and Posture
JF - Gait and Posture
IS - 2
ER -