Utilized coefficient of friction during walking: static estimates exceed measured values

This study compared utilized coefficient of friction (COF) measured during nonslip pedestrian gait to estimated utilized COF values calculated using anthropometric (i.e., leg length) and stride characteristic data (i.e., impact angle, step length). Twenty healthy adults walked at slow, medium, and fast speeds with kinematic and kinetic data recorded simultaneously. Estimated and measured impact angle varied with walking speed, with greater angles evident with faster speeds (p < 0.001 and p < 0.05, respectively). The estimated impact angle was greater than the measured impact angle (p < 0.05). Estimated and measured peak utilized COF values varied with walking speed, with higher utilized COF values evident with faster speeds (p < 0.001 and p = 0.001, respectively). Estimated utilized COF values were 86, 118, and 131% greater than measured peak utilized COF values for slow, medium, and fast speeds, respectively (p < 0.001). Higher estimated utilized COF values varied moderately with increased measured peak utilized COF values (r = 0.522; p < 0.001). These data suggest that impact angle and step length alone cannot be used to accurately assess the utilized COF on level walking surfaces.     

An evaluation of the effectiveness of substance abuse programming for female offenders

Although a recent meta-analysis reported that substance abuse treatment was associated with moderate reductions in recidivism for female offenders, very few of the tests of treatment (k = 4) focused on adults. The purpose of this study was to contribute to this relatively sparse area of scientific inquiry by exploring the effectiveness of substance abuse programming in reducing recidivism for a sample of 98 federally sentenced female offenders in Canada. Results revealed a significant reduction in general recidivism for treated substance abusers. Moreover, the data indicated that violent reoffending was also reduced for the treated group, although the difference did not reach statistical significance.     

One-stop border posts and informal livelihoods in Busia,Kenya

‘One-stop border posts’ (OSBP) are being developed on East African trade corridors to support growth in cross-border trade in the region. This article presents a household survey examining the impact of the OSBP at Busia on the Kenya–Uganda border on the livelihoods of informal traders and workers. It finds positive effects through enhanced access to cross-border trade. However, it also finds negative effects, including reduced work opportunities for unskilled manual workers. Further research is needed into the long-term effects on the price and foreign exchange differentials which currently incentivise the informal trade, before the effects can be fully assessed.