Showing 2 results for Frequency Spectrum
Mr. Milad Alipour Sari Nasirloo, Dr. Aydin Valizadeh Orang, Dr. Amirali Jafarnezhadgero, Dr. Marefat Siahkouhian, Ms Maryam Alsadt Emami,
Volume 10, Issue 3 (4-2024)
Abstract
Introduction: The prevalence of diabetes is increasing worldwide. This disease affects body mechanics during walking. The purpose of this study was to investigate the effect of 8 weeks of walking exercises on the frequency spectrum of ground reaction forces during walking in diabetic patients without neuropathy.
Methods: This study was semi-experimental. The sample included 24 diabetic individuals (mean diabetic age: 3.1±0.9 years, mean glucose level: 151.4±10.4 mg/dL) who were selected through convenience sampling. The subjects were randomly divided into two experimental groups (12 individuals) and a control group (12 individuals). Before and after the 8-week walking training protocol, the subjects walked at a desired speed on the force plate. The ground reaction force data in three directions (vertical, posterior-anterior, and internal-external) were converted from time function to frequency function using Fourier transform (harmonic analysis) and MATLAB software version 2016.
Results: Within the group, the results showed a significant increase in the frequency with a power of 99.5% in the vertical component (P=0.016), internal-external component (P=0.002), and anterior-posterior component (P=0.026) of the ground reaction forces. The post-test values of the ground reaction force were significantly reduced compared to the pre-test values. The number of necessary harmonics in the internal-external component of the ground reaction force in the post-test significantly increased compared to the pre-test (P=0.017). Additionally, the number of essential harmonics (P=0.039) and the median frequency (P=0.026) in the anterior-posterior component of the ground reaction force had a significant decrease in the post-test compared to the pre-test.
Conclusions: The results of this study demonstrated that walking exercises have a positive effect on the frequency content of the ground reaction force in diabetic patients without neuropathy and improves the frequency with a power of 99.5% and the number of essential harmonics in different components. It can have beneficial effects on reducing the forces on the lower limbs during walking.
Dr Mohsen Barghamadi, Dr Amir Fatollahi, Mr Morteza Shokrzadehsarbanlar,
Volume 10, Issue 3 (4-2024)
Abstract
Introduction: The ground reaction force frequency spectrum analysis of handball players is an important method to determine effective parameters of sports performances. The frequency spectrum of ground reaction forces in handball players is important to determine parameters affecting sports performance. Therefore, this study aimed to contrast the comparison effects of immediate and long-term use of arch support insoles on the ground reaction forces frequency spectrum in the handball players’ three-step shot technique with flat feet during landing.
Methods: This study was a semi-experimental and observational type. Participants were randomly divided into three equal groups, including the control group, an immediate intervention group, and a long-term intervention group. A force plate was included in the walkway to collect ground reaction forces. The normality distribution of data was examined and confirmed by using the Shapiro-Wilk Test. One-way ANOVA test was used to analyze the data. All analyses were performed using Statistical Package for Social Sciences (SPSS) version 24.
Results: In the media-lateral direction, the median frequency component showed a significant difference during the landing of the handball players’ three-step shot technique between the three groups (P=0.043; F=3.54). Also, in the media-lateral direction, the band frequency component showed a significant difference during the landing of the handball players’ three-step shot technique between the three groups (P=0.044; F=3.55). Other components of the ground reaction force frequency spectrum during landing did not show any significant difference (P>0.05).
Conclusions: It seems a lower frequency spectrum during landing after immediate and long-term use of arch support insoles, reduced the risks of lower limb injuries and instability of ankle in the handball players with flat feet during the three-step shot technique. This needs to be verified in future studies.
