COMPARISON OF THREE MOTION ANALYSIS PROGRAMS BASED ON THE SHOT PUT PERFORMANCE

The aim of the study was to compare the results obtained using the three programs: Vicon, OpenSim and AnyBody. The feasibility of the application and of the selection of one of the programs for further analysis of the sport technique was checked. In the experiment herewith, the torque and power as function of time in the joints of the lower limb during the last phase of shot put was computed. Examinations of the kinematic and kinetic parameters of analyzed movement were carried out using Vicon system and Kistler force plates. Three top level national competitors took part in the study. The differences between the torques and power were checked with a modified RMS index. The results obtained indicate that OpenSim program may be useful for further studies, and in particular in controlling and analyzing the neuromusculaskeletal system

A SIMPLE MATHEMATICAL MODEL OF A SINGLE SCULLING TECHNIQUE

The results in sport in rowing depend on the two most important factors, such as the athlete physical features and the techniques of motion. The assessment and optimisation of rowing techniques are possible only when one disposes the reliable mathematical model predicting the results of the regatta that is the time of covering an assumed distance. A single scull participating in the 2000 meters distance regatta is our subject. The purpose of this study is to create a simplified mathematical model to simulate the rowing boat dynamics. The boat-rower system is treated as a material point here. The oar has a prescribed angular motion vs. oarlock depending on the time. The hydrodynamics force distribution to be developed on the oar’s blade has been modelled here. Then, the boat motion was described by a single nonlinear ordinary differential equation (NODE). The proposed simple model gives the possibilities of fast and reliable simulation of the single sculling technique and forecasts the result of rowing regattas

Women after Bilateral Surgical Correction of Hallux Valgus Do not Show Improvement in Spatiotemporal Gait Parameters at 18 Weeks Postoperatively

Background: Hallux valgus (HV) is a gait-altering orthopedic deformity, somewhat more prevalent in women, which often affects both limbs. Although surgery is a commonly applied treatment, there is no consensus in the literature on how invasive HV correction affects spatiotemporal gait parameters, or how quickly improvement can be expected. We investigated gait parameters in female HV patients who underwent bilateral surgical correction of hallux valgus, both preoperatively and 18 weeks following surgery (a timeframe relevant from the perspective of physical therapy), and also in relation to a non-HV control group. Methods: A total of 23 women aged 40–70 years, with moderate to severe HV deformity in both feet, were assessed preoperatively and 18 weeks postoperatively, and an age-matched control group of 76 healthy women was also assessed. A total of 22 spatiotemporal parameters were collected during 30 s walks over an electronic walkway (Zebris Medical System). Results: Of the 22 parameters analyzed, significant differences between the preoperative experimental and control groups were found only in 4 parameters (Velocity, Right step time, Total double support and Stride time), but in 16 parameters between the postoperative experimental and control groups (the greatest impact being found for: Left and Right Step time, Stride time, Cadence, Right Foot rotation, Left Step length (% leg length) and Stride length (% leg length)). Conclusions: Women after bilateral HV correction did not exhibit improved (i.e., more normal) gait parameters at 18 weeks postoperatively; rather, they showed more gait abnormalities than preoperatively. These findings urge longer-term planning of postoperative rehabilitation, involving continual evaluation of gait improvement