The immediate effect of dynamic stretching of Quadriceps, Hamstrings and Gastrocnemius muscles on the knee joint Proprioception (original) (raw)
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2020
Anterior cruciate ligament injury is often non-traumatic and occurs in landing and cutting following an incorrect knee joint alignment. The present study aimed to compare the knee joint kinematic parameters of adolescent female athletes during sidestep cutting maneuver before and after fatigue in predictable and unpredictable settings. Methods This is a quasi-experimental study conducted in the summer 2019. The study population consists of all adolescent female athletes in Kerman, Iran. Of these, 49 athletes were selected using purposive and convenience sampling methods. Each subject first ran a distance (10 m) and then made a vertical jump towards the ball at the specified location. Afterwards, she ran to the cutting location (a 3-m distance) and performed sidestep cutting at the specified angle, predictably or unpredictably, before and after fatigue. Kinematic data were recorded at a sampling rate of 200 HZ, and then analyzed in MATLAB and SPSS software using mixed repeated measures ANOVA at the significant level of P<0.05. Results Statistical analysis results showed that sidestep cutting maneuver after fatigue, despite a significant decrease in knee flexion (P=0.001), significantly increased the knee valgus (P=0.001) and tibia rotation (P=0.001) angles. Conclusion There is an increased risk of injury due to changes in kinematic parameters caused by fatigue and unpredictable cutting maneuvers.
Research in Medicine, 2020
Email:rezamansorizadeh92@gmail.com Background: Groin pain is one of the common problems in multidirectional sports. The rate and complexity of injury result in prolongation and high rate of this injury. However, no study is reported to accurately examine the muscle activity during dynamic and functional activities. Therefore, the present study was conducted to compare the average amplitude of EMG (AEMG) and co-contraction ratio (CCR) of selected thigh and thoracic muscles during turning in individuals with chronic groin pain and healthy individuals. Materials and Methods: A totsl of 32 male athletes (groin pain group, n = 16, and healthy group. n = 16) with the mean age of 25 years participated in the present experimental study. The electrical activity of the Internal oblique / Transversus Abdominis (IO / Tr. A), Multifidus (MF), Adductor Longus (AL), and Gluteus Medius (GM) muscles during the 11 cycles of gait coupled with turning and the mean muscle activity and muscle co-contract...
Scientific Journal of Rehabilitation Medicine, 2021
Background and Aims One of the most common and dangerous injuries in sports is an Anterior Cruciate Ligament (ACL) injury. Today, despite the ACL injury prevention programs, the prevalence of this injury remains high. Most of the instructions used in injury prevention programs are based on internal focus, while studies have shown that using external focus can improve performance in individuals. The purpose of this study was to investigate the effect of focus of attention on eight weeks of anterior cruciate ligament injury prevention training on landing skill kinetic variables in soccer players. Methods The current methodology included 35 players from 3 premier league teams in Tehran province. The teams were randomly divided into three groups of Prevent injury and Enhance Performance (PEP) exercises based on the External Focus (EF) (12 people), Internal Focus (IF) (12 people), and control group (11 people). In the pretest of ground reaction force, rate of loading, and time to stabili...
2018
Theories are in paradox in relation to the variability pattern with being skilled. Then this research has investigated two types of absolute and coordination variability during basketball free throw learning, with isolating mechanical and dynamical degrees of freedom. Methods: Twenty self-declared participants were randomly assigned into two groups: physical practice and control. Experimental group practiced in 12 sessions of 50 trials. Absolute variability was measured by root mean square error and coordination variability was assessed using vector coding. Results: The physical practice group was significantly better than control group in accuracy scores. Results in relation to the absolute variability revealed, only in the ankle joint, physical practice and control groups are different (P=0.037, F=5.07) and the pattern of changes supported Bernstein's theory. In the case of coordination variability, there was no difference between the two groups in any of the joints coupling. But the wrist-elbow pattern of changes in physical practice group was in accordance with the theory of dynamic systems. Conclusion: Overall, it seems that wrist movement and wrist-elbow coordination are very important in free throw shooting skill. Also, the findings of this study showed that it is necessary to isolate mechanical and dynamical degrees of freedom in the measuring and discussing the Theories regarding the movement variability.
Journal of Sport Biomechanics
Objective: Wrestling is a fast-paced activity in which resistance training is essential to improve athlete performance. We evaluated the effect of comparison of the effect of eight weeks resistance training with two patterns of pyramidal and inverse pyramidal on bio-motor ability, Anthropometrical and skill profile of freestyle wrestlers. Methods: In this semi experimental study, 24 male freestyle wrestlers were randomly assigned into two groups [pyramidal (n=12) and inverse pyramidal endurance (n=12)]. The pyramidal and inverse pyramidal resistance training included (8 weeks, 3 times per a week, 60 minutes per session). Bio-motor ability, Anthropometrical and skill profile were measured at baseline and at the end of the study. Paired and independent sample t-test were used to compare within and between-group means and the results were tested at the significant level P<0.05. Results: Training lead to changes on weight, body mass index, body fat percent, maximum power into pyramid...
2019
The purpose of this study was to compare the effect of shoulder abduction angles, dominant and nondominant arm and external loading on co-contraction ratio during arm abduction in scapular plane in overhead athletes and non-athletes. 10 swimmers, 10 handball players and 10 tennis players and ten nonathletes voluntarily participated in this study. Electromyography activity of shoulder muscles (middle and anterior deltoid; upper, middle and lower trapezius; infraspinatus, serratus anterior and latissimus dorsi) during dynamic and static arm abduction in 3 different angles (0-45o in 1second and holding it for 3 seconds, 0-90o in 2 seconds and holding it for 3 seconds, 0-135o in 1 second and holding it for 3 seconds) was recorded for dominant and non-dominant arm in loading and non-loading conditions. Co-contraction ratio of shoulder muscles was calculated for both groups. Findings indicated external loading, shoulder dominance and abduction angles had significant effect on shoulder mus...
Journal of Mazandaran University of Medical Sciences, 2016
Background and purpose: Chronic non-specific low back pain (CNLBP) is associated with decreased lumbar Multifidus (LM) muscle cross-sectional area (CSA) and Transverse abdominis (TrA) muscle strength which highly predispose the person to recurrent occurrence of disease. We compared the Pilates (PL) and McKenzie (MK) methods on LM CSA and TrA strength in these patients. Materials and methods: In this clinical trial, 47 female patients, mean age 39.7 years, with CNLBP were allocated to one of three groups including PL training (n=16), MK exercises (n=15), and control (n=16). The measurements of LM CSA and TrA muscle strength were performed using imaging ultrasonography and Bent Knee Lowering Test, respectively at baseline, following a 6-week intervention program, and a follow-up of one month. To evaluate the changes of outcome measurements over time, repeated measures ANOVA test was applied at P< 0.05 in SPSS V. 21. Results: Compared with MK exercises, PL training could significant...
Archives of Rehabilitation, 2016
Objective The aim of this study was the comparison of the functional stability of dominant and non-dominant shoulder in female volleyball players with and without anterior shoulder instability, using YBT-UQ. Materials & Methods In this descriptive study, 28 female university volleyball players (age=20 to 25 years) were categorized into healthy (n=14) and anterior shoulder instability (n=14) group. Upper quarter y balance test (YBT-UQ) was used for measuring functional stability of both dominant and non-dominant shoulder. After checking the normal distribution of the results with 1-s Kolmogorov-Smirnov, paired sample t-test and independent sample t-test were used for comparing the dominant and non-dominant shoulder's functional stability and for comparing the results between groups, respectively. Results Higher YBT-UQ composite score was observed in non-dominant shoulder and dominant shoulder of the healthy group and the non-dominant shoulder and dominant (injured) shoulder of shoulder instability group, respectively. No significant difference was observed between functional stability of both shoulders of the healthy group (P=0.144), while the functional stability of the non-dominant shoulders of the instability group was significantly higher than the dominant unstable shoulders (P=0.001). The results of functional stability of the unstable shoulders of the injured group were significantly lower than the results of the dominant shoulders of the healthy group, while in non-dominant side, all directions but the Superolateral direction showed significant difference. Conclusion Based on the results of this study, functional stability of the unstable shoulder of female university volleyball players is lower than the functional stability of their non-dominant side or the functional stability of the healthy subjects; Therefore, we suggest that the upper extremity stabilization exercises, specially the closed kinetic chain exercises should be added to the shoulder rehabilitation programs.
Occupational Medicine, 2020
Introduction: Carpet industry is one of the most important, dangerous and traditional industries in Iran. Non-Ergonomic factors such as non-standard work tools, inappropriate physical postures, long hours of work and insufficient rest of carpet weavers can lead to musculoskeletal disorders. The purpose of this study was to determine the prevalence of musculoskeletal discomfort and its relationship with posture in rural carpet weavers in Boshruyeh city. Methods: This study is descriptive, analytical and cross-sectional. The sampling method was census-based and included all rural carpet weavers in Boshruyeh city who were active at least 6 months prior to the beginning of the study and were willing to cooperate (62 people). In order to investigate musculoskeletal discomforts, used from Cornell Musculoskeletal Discomfort Questionnaire (CMDQ) and for posture assessment, The Occupational Repetitive Action Index (OCRA) method was used. The collected data by using SPSS software IBM 24 (Pe...
2017
یاهریغتم زا یبختنم رب یمومع یزا��س هدامآ زاف نیرمت هتفه ت��شه ریثأت ی��سررب ،هعلاطم نیا زا فده :فده .دوب ناوناب ودناوکت یلم میت یکیژولویزیف و یکیرتموپورتنآ ،یکیناکمویب ینزو و لا��س )23/22±1/98( ین��س نیگنایم اب نلاا��سگرزب ناوناب یلم میت وضع هبخن راکودناوکت هن :اه شور یکیژولویزیف و یکیرتموپورتنآ ،یکیناکمویب یاهریغتم .دنتشاد تکرش قیقحت نیا رد مرگولیک )61/88±8/44( و یبلق تماقتسا ،یندب بیکرت ،نزو ،یزاوه یب ناوت ،یرادید لمعلا سکع تعر��س ،یکباچ ،تعرس لما��ش یریگ هزادنا دروم )هسلج 72( ینیرمت هرود هتفه تشه زا دعب و لبق نومزآ .دوب ینلاضع تماقت��سا و یقورع توافت زیمت یارب هتسباو یت یرامآ نومزآ زا و کلیو وریپاش نومزآ زا اه هداد ندوب لامرن نییعت یارب .تفرگ .دش هدافتسا 0/05 یراد ینعم حطس رد ،تانیرمت زا دعب و لبق اهریغتم ،نزو نازیم .)P =0/000( داد ناشن ار اه یندومزآ یبرچ دصرد نازیم رد یراد ینعم شهاک قیقحت جیاتن :اه هتفای )پماجوگرا( یزاوه یب ناوت و ندب یمومع لمعلا سکع تعر��س ،یکباچ یاهدروکر و یندب هدوت صخا��ش یقورع و یبلق تماقت��سا رد یرادانعم ش��یازفا نینچمه جیاتن .دو��ب هتفای شهاک تانیرمت زا ل�...