Miss Samira Sadat Sajjadi, Mr Mohammad Aziminia, Dr Ali Abbasi, Dr Mehdi Khaleghi Tazji,
Volume 0, Issue 0 (11-2019)
Abstract
Introduction
During the menstrual cycle, the body experiences fluctuations in sex hormones, which can affect performance and injury rates in women. In the integrated human body system, the coordination between joints and limbs influences each other and the ultimate goal of movement.
Objective
The study aimed to investigate the impact of different phases of the menstrual cycle on the variability of pelvic-hip rhythm coordination during the execution of the roundhouse kick in taekwondo.
Methods
This applied, quasi-experimental study was conducted on 12 elite female taekwondo athletes from Tehran, selected through convenience sampling. Kinematic data were collected using 8 Vicon cameras (240 Hz) and the Plug-in Gait marker system across three menstrual phases (follicular, ovulation, and luteal). The data were processed using a fourth-order Butterworth filter. Joint range of motion (ROM) was analyzed using Nexus software, and coordination variability was calculated using the modified vector coding method. One-way ANOVA and parametric statistical mapping were used to examine differences in joint angles, coordination patterns, and variability.
Results
The results of study showed no significant relationship between the ROM of the hip and pelvic joints, the frequency of coordination patterns, and variability across different phases of the menstrual cycle (P ≥ 0.05).
Discussion and Conclusion
The findings suggest that adaptations developed through years of training under various menstrual cycle conditions may mitigate the significant impact of this factor on the performance of elite athletes. Additionally, the skill level of professional athletes enables them to optimally utilize coordination variability to achieve desired performance outcomes.
Hossein Nabavinik, Mohsen Ali Darchini, Reza Azimi,
Volume 20, Issue 23 (9-2022)
Abstract
Introduction and Objective: Core stability and plyometric exercises are training methods that athletes use to improve their performance. The purpose of this study was exploring the effect of a period of six week plyometric and core stability exercise on some of physical fitness of boy's athlete. Methods: 36 male athletes who were male with 11-14 years old participated in the semi-experimental study. They randomly divided in three group that each group has 12 subjects (first group; core stability exercise, second group; plyometric exercise and third group; control). The performance tests (standing broad Jump, Vertical Jump, 9.1 m Sprint, Shuttle Run, Flexibility and seated medicine ball toss tests) applied a day before starting core stability and plyometric exercises. Then post-test applied. In order to analysis data, ANOVA test was used (p<0.05). Results: Both core stability and plyometric exercise group showed significance increase in performance tests (Standing Broad Jump, Vertical Jump, 9.1 m Sprint, Shuttle Run). Conclusion: Based on the findings, we recommend the core stability and plyometric exercises in order to improve some of physical fitness of athletes.
