To determine whether Dr. Scholl's Active Series (DSAS) footwear insoles alter biomechanical variables associated with running injuries.
Randomized, controlled experiment.
Sport medicine and biomechanics gait analysis laboratory.
Fifteen healthy adults.
The control condition was the participant's own athletic footwear. The experimental condition was the participant's own athletic footwear plus a DSAS insole. Participants completed running gait analysis trials with each condition.
Peak vertical loading rates (VLRs), peak ankle eversion velocities (AEVs), peak ankle eversion angles (AEAs), and knee abduction angular impulses (KAAIs) were calculated and compared between the control and DSAS conditions because these variables have been associated with plantar fasciitis (VLRs), tibial stress syndrome (AEVs, AEAs), and patellofemoral pain syndrome (KAAIs).
Dr. Scholl's Active Series insoles reduced VLRs across participants by 16% (P < 0.001) but had no consistent influence on AEVs, AEAs, or KAAIs. Participant-specific responses showed that most runners either experienced AEA and KAAI reductions or no change with the DSAS insole, whereas AEVs commonly increased with the DSAS insole.
Dr. Scholl's Active Series insoles demonstrate efficacy in reducing VLRs, which are associated with plantar fasciitis. Biomechanical changes to variables associated with tibial stress syndrome (AEVs, AEAs) and patellofemoral pain syndrome (KAAIs) were inconsistent.
*Cumming School of Medicine, University of Calgary, Calgary, AB, Canada;
†Biomedical Engineering Program, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada; and
‡Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada.
Corresponding Author: Ryan T. Lewinson, PhD, 3330 Hospital Drive NW, Calgary, AB, Canada T2N 4N1 (firstname.lastname@example.org).
R. T. Lewinson and D. J. Stefanyshyn hold a US Patent for a technology to predict biomechanical responses to footwear orthotics. R. T. Lewinson was funded by a Vanier Canada Graduate Scholarship from the Canadian Institutes of Health Research, an Alberta Innovates Health Solutions MD-PhD Studentship, and a Pre-Doctoral Scholarship from the Killam Trusts. Funding agencies played no role in study conception, design, analysis, or writing of this manuscript.
The authors report no other conflicts of interest.
Received September 13, 2016
Accepted September 02, 2017