17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1124
Session: [CP-BN02] Sports technology
Lecture room: d/South
Date & time: 08.07.2017 / -
Authors: Sukdolak, C., KORNFEIND, P., STAFYLIDIS, S., BACA, A.
Institution: University of Vienna
Department: Sport Science
Country: Austria
Abstract text Introduction: There are many concepts to correct deformities of the foot or malfunctions and to reduce involved forces as well as their consequences to the whole musculoskeletal system. Shoe inserts are one of them. They can be roughly divided into two categories: passive bracing (orthotic insoles = OI) (1) and active stimulating (proprioceptive neuromuscular stimulating insoles = PNSI) (2). A novel shoe insole (NI) intends to combine the characteristics of both OI and PNSI inserts. Therefore, the purpose of the present study was to investigate the mechanical properties of the NI compared to the OI and the PNSI during running. Methods: Five male participants (age: 20.81.9, height: 178.05.0, weight: 72.24.7) without any deficit in their lower limbs ran at 2.3m/s for 30 seconds with the NI, the OI and the PNSI. Plantar force of 25 consecutive steps was measured by an in-shoe pressure measurement system (Pedar-X, Novel) with 100Hz. Peak pressure was evaluated and normalized over the stance phase in 0-100% of all steps. One-way ANOVA with repeated measures was used to determine possible differences between the soles. All significant effects (p < 0.05) were followed by Bonferroni post hoc tests. Results: The NI showed significant (<.01) lower pressure time integral (PTI) than the OI and PNSI (65.24.3, 81.39.0, 76.35.9 kPas respectively). The force time integral (FTI) of the NI (287.45.6 Ft) was also significant (<.01) lower than the OI (302.96.8 F t) but not to the PNSI. The max pressure of the NI was also significant (<.05) lower at 10 % and 40-100 % of the stance phase than the OI and PNSI. At 0% of the stance the NI exhibited reduced max pressure compared to the PNSI but not the OI. On the contrary, at 20-30% of the stance the NI exhibited significant (<.05) higher max pressure than the OI but not the PNSI. At 30% of the stance the NI showed significant (<.05) higher max pressure compared to the PNSI. Discussion: The NI showed an overall PTI reduction of 20 and 15% compared to OI and PNSI. That could be attributed between 40 to 100% of the stance time. Though at the initial contact phase (0-30%) the NI exhibited relative higher PTI values than OI and PNSI indicating a smaller contact area. This is supported by the smaller surface area (~47, ~54 and ~51cm, NI-OI-PNSI respectively), measured by means of optical scan, at the heel (1/3 of the soles length) region. In conclusion, it was shown that a combination of the OI and PNSI characteristics in one insole could be functional and promising. Further studies should be conducted in order to assess the effect of the different insoles on the neuromechanics and joint angles of the lower limb. References: 1: Zhai et al. (2016) J Phys Ther Sci 28, 30783083 2: Dankerl et al. (2016) Prosthet Orthot Int 40 (3), 369376 Contact: christian.sukdolak@univie.ac.at
Topic: Sports Medicine and Orthopedics
Keyword I: Plantar Pressure
Keyword II: Insole
Keyword III: Running