PMID- 22046720
OWN - NLM
STAT- MEDLINE
DCOM- 20111122
LR  - 20170214
IS  - 0018-7208 (Print)
IS  - 0018-7208 (Linking)
VI  - 53
IP  - 5
DP  - 2011 Oct
TI  - The effect of transverse shear force on the required coefficient of friction for 
      level walking.
PG  - 461-73
AB  - OBJECTIVE: An enhanced methodology to extract the required coefficient of 
      friction (RCOF) value was used to investigate the effects of the transverse shear 
      component of the ground reaction force (GRF) on the RCOF. BACKGROUND: The RCOF is 
      an important indicator for slip incidents. However,the extraction of the RCOF 
      from GRF is not standardized. The transverse shear force is usually ignored in 
      calculating the RCOF value. METHOD: For this study, 40 participants performed 
      four walking conditions. The RCOF values both with (RCOF2) and without (RCOF1) 
      the transverse shear force were identified from each strike by the use of an 
      enhanced method and were compared. RESULTS: A total of 24,851 strikes were 
      collected. The transverse component increased the RCOF value by more than 10% in 
      7.2% of the strikes. In 10.4% of the strikes, the RCOF2 occurred at least 20 ms 
      earlier and the RCOF value was on average 8.9% larger than RCOF1. CONCLUSION: 
      With this method, we were able to successfully identify the RCOF in a 
      significantly large number of strikes across 40 participants. In a portion of the 
      strikes, the transverse shear force increased the RCOF significantly. In a 
      significant portion of the strikes, the RCOF2 occurred much earlier than RCOF1. 
      APPLICATION: Better estimates of the RCOF magnitude and instant of occurrence 
      could potentially improve risk assessment and identification of critical instants 
      in gait.
FAU - Chang, Wen-Ruey
AU  - Chang WR
AD  - Liberty Mutual Research Institute for Safety, Hopkinton, MA 01748, USA. 
      Wen.Chang@LibertyMutual.com
FAU - Chang, Chien-Chi
AU  - Chang CC
FAU - Matz, Simon
AU  - Matz S
LA  - eng
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - Hum Factors
JT  - Human factors
JID - 0374660
SB  - IM
MH  - Adolescent
MH  - Adult
MH  - Biomechanical Phenomena
MH  - Female
MH  - Floors and Floorcoverings
MH  - *Friction
MH  - Gait/physiology
MH  - Humans
MH  - Male
MH  - Materials Testing
MH  - Middle Aged
MH  - Regression Analysis
MH  - Risk Assessment
MH  - Shoes
MH  - Surface Properties
MH  - Walking/*physiology
MH  - Young Adult
EDAT- 2011/11/04 06:00
MHDA- 2011/12/13 00:00
CRDT- 2011/11/04 06:00
PHST- 2011/11/04 06:00 [entrez]
PHST- 2011/11/04 06:00 [pubmed]
PHST- 2011/12/13 00:00 [medline]
AID - 10.1177/0018720811414885 [doi]
PST - ppublish
SO  - Hum Factors. 2011 Oct;53(5):461-73. doi: 10.1177/0018720811414885.