PMID- 28640853
OWN - NLM
STAT- MEDLINE
DCOM- 20170918
LR  - 20181113
IS  - 1932-6203 (Electronic)
IS  - 1932-6203 (Linking)
VI  - 12
IP  - 6
DP  - 2017
TI  - Required coefficient of friction in the anteroposterior and mediolateral 
      direction during turning at different walking speeds.
PG  - e0179817
LID - 10.1371/journal.pone.0179817 [doi]
LID - e0179817
AB  - This study investigated the required coefficient of friction (RCOF) and the 
      tangent of center of mass (COM)-center of pressure (COP) angle in the 
      mediolateral (ML) and anteroposterior (AP) directions during turning at different 
      walking speeds. Sixteen healthy young adults (8 males and 8 females) participated 
      in this study. The participants were instructed to conduct trials of straight 
      walking and 90 degrees  step and spin turns to the right at each of three self-selected 
      speeds (slow, normal, and fast). The ML and AP directions during turning gait 
      were defined using the orientation of the pelvis to construct a body-fixed 
      reference frame. The RCOF values and COM-COP angle tangent in the ML direction 
      during turning at weight acceptance phase were higher than those during straight 
      walking, and those values increased with increasing walking speed. The ML 
      component of the RCOF and COM-COP tangent values during weight acceptance for 
      step turns were higher than those for spin turns. The mean centripetal force 
      during turning tended to increase with an increase in walking speed and had a 
      strong positive correlation with the RCOF values in the ML direction (R = 0.97 
      during the weight acceptance phase; R = 0.95 during the push-off phase). 
      Therefore, turning, particularly step turn, is likely to cause lateral slip at 
      weight acceptance because of the increased centripetal force compared with 
      straight walking. Future work should test at-risk population and compare with the 
      present results.
FAU - Yamaguchi, Takeshi
AU  - Yamaguchi T
AD  - Graduate School of Engineering, Tohoku University, Sendai, Miyagi, Japan.
AD  - Graduate School of Bioengineering, Tohoku University, Sendai, Miyagi, Japan.
FAU - Suzuki, Akito
AU  - Suzuki A
AD  - Graduate School of Engineering, Tohoku University, Sendai, Miyagi, Japan.
FAU - Hokkirigawa, Kazuo
AU  - Hokkirigawa K
AD  - Graduate School of Engineering, Tohoku University, Sendai, Miyagi, Japan.
LA  - eng
PT  - Journal Article
DEP - 20170622
PL  - United States
TA  - PLoS One
JT  - PloS one
JID - 101285081
SB  - IM
MH  - Female
MH  - *Friction
MH  - Humans
MH  - Male
MH  - Rotation
MH  - Walking Speed/*physiology
MH  - Young Adult
PMC - PMC5480978
COIS- Competing Interests: The authors have declared that no competing interests exist.
EDAT- 2017/06/24 06:00
MHDA- 2017/09/19 06:00
PMCR- 2017/06/22
CRDT- 2017/06/23 06:00
PHST- 2016/08/25 00:00 [received]
PHST- 2017/06/05 00:00 [accepted]
PHST- 2017/06/23 06:00 [entrez]
PHST- 2017/06/24 06:00 [pubmed]
PHST- 2017/09/19 06:00 [medline]
PHST- 2017/06/22 00:00 [pmc-release]
AID - PONE-D-16-34042 [pii]
AID - 10.1371/journal.pone.0179817 [doi]
PST - epublish
SO  - PLoS One. 2017 Jun 22;12(6):e0179817. doi: 10.1371/journal.pone.0179817. 
      eCollection 2017.