COUNTERMOVEMENT JUMP VARIABLES AND ESTIMATED PEAK POWER IN FEMALE CHILDREN WITH DYNAMIC KNEE VALGUS

The purpose of the current study was to evaluate countermovement jump biomechanical variables and to estimate peak power using different approaches in female children with dynamic knee valgus. Twenty-six female children, aged 10-14, with dynamic knee valgus were recruited. A Kistler force plate was used to record the kinetic data during three CMJ trials. Less peak power (estimated using allometric method) and greater landing force during countermovement jump were significantly correlated with valgus angle in female children (P= 0.033, R= -0.419, and P= 0.0.43, R= 0.413, respectively). Estimated peak power results using Sayers and Harman methods were significantly different from actual peak power outcomes (P=0.042, P=0.027 respectively). Greater landing force and decreased peak power during CMJ showed to be correlated with increased valgus angle in female children. Additionally, the allometric method seemed to be more accurate for estimating peak power compared to other methods

رابطه بین ابعاد آنتروپومتریک، وضعیت ارگونومی و نمره عوامل خطر با اختلالات اسکلتی- عضلانی کارگران در منتخب صنایع لوازم خانگی اصفهان

Background and Objectives: Work-related musculoskeletal disorders are the most important occupational diseases. This study aimed to investigate the correlation between company ergonomic situation and anthropometric dimensions with musculoskeletal disorders in workers. Materials and Methods: 82 female and male volunteer workers participated in this cross-sectional study. The musculoskeletal disorders, ergonomic situation, and anthropometric dimensions were examined using the Nordic and Dutch musculoskeletal questionnaires and tape meters. The study protocol was approved by the Committee for Ethics in Biomedical Research of the Allameh Tabataba’i University with obtaining ethics. Data were analyzed using SPSS ver.26 software and running Spearman and Chi-Square tests at the significance level of 0.05. Results: Significant correlations were found between the company ergonomic situation with musculoskeletal disorders in the neck (P=0.001), shoulder (P<0.001), elbow (P=0.004), wrist (P=0.004), upper back (P<0.001), lumbar (P<0.001), thigh and buttock (P=0.028), knee (P<0.001), and ankle (P=0.036). Moreover, there were significant correlations between the ratio of chair height to popliteal height with musculoskeletal disorders in lumbar (P=0.026), thigh and buttock (P=0.015), knee (P<0.001), and ankle (P=0.038), also between the ratio of chair depth to thigh length with shoulder (P=0.043), upper back (P<0.001), lumbar (P<0.001), thigh and buttock (P=0.001), and knee (P=0.004), and between the ratio of chair height to shoulder height with shoulder region (P=0.002). Conclusion: It seems that there is a correlation between company ergonomic situation and the proportion of anthropometric dimensions with chair dimensions with the prevalence of musculoskeletal disorders in workers. How to cite this article: Esmaili F, Sheikhhoseini R, Piri H. Association between Ergonomic situation and Risk factor Score with Worker’s Musculoskeletal Disorders with Sitting Work Position in Selected Home Appliance Industries in Isfahan. Irtiqa Imini Pishgiri Masdumiyat. 2022;10(2):108-15.  سابقه و هدف: اختلالات اسکلتی- عضلانی مرتبط با کار مهم‌ترین بیماری شغلی است. هدف از این مطالعه بررسی ارتباط بین ابعاد آنتروپومتریک، وضعیت ارگونومی و نمره عوامل خطر با اختلالات اسکلتی- عضلانی کارگران در منتخب صنایع لوازم خانگی اصفهان بود. روش بررسی: در این مطالعه مقطعی، 82 کارگر مرد و زن داوطلب شرکت نمودند. اختلالات اسکلتی- عضلانی، وضعیت ارگونومی و ابعاد آنتروپومتریک به ترتیب با استفاده از پرسشنامه‌های نوردیک و اختلالات اسکلتی-عضلانی هلندی و متر نواری ارزیابی شد. مطالعه ملاحظات اخلاقی را رعایت کرد. تجزیه‌وتحلیل داده‌ها به کمک نرم‌افزار spss26 و با استفاده از آزمون‌های آماری اسپیرمن و کی دو در سطح معناداری 0/05 انجام شد. یافته‌ها: ارتباط معناداری بین وضعیت ارگونومی کارخانه با اختلالات اسکلتی-عضلانی کارگران در گردن (P=0.001)، شانه (P<0.001)، آرنج (P=0.004)، مچ دست (P=0.004)، فوقانی پشت (P<0.001)، کمر (P<0.001)، باسن و ران (P=0.028)، زانو (P<0.001)، مچ پا (P=0.036) مشاهده شد. به‌علاوه بین نسبت ارتفاع صندلی به ارتفاع رکبی با اختلالات اسکلتی-عضلانی در ناحیه کمر (P=0.026)، باسن و ران (P=0.015)، زانو (P<0.001) و مچ پا (P=0.038)، همچنین بین نسبت عمق صندلی و طول کفل-رکبی با ناحیه شانه (P=0.043)، فوقانی پشت (P<0.001)، کمر (P<0.001)، باسن و ران (P=0.001) و زانو (P=0.004)، و بین نسبت ارتفاع پشتی صندلی به ارتفاع شانه با ناحیه شانه (P=0.002) ارتباط معنی‌داری وجود دارد. نتیجه‌گیری: به نظر می‌رسد وضعیت ارگونومی کارخانه و همچنین تناسب ابعاد آنتروپومتریک با ابعاد میز و صندلی با شیوع اختلالات اسکلتی-عضلانی کارگران ارتباط دارد. How to cite this article: Esmaili F, Sheikhhoseini R, Piri H. Association between Ergonomic situation and Risk factor Score with Worker’s Musculoskeletal Disorders with Sitting Work Position in Selected Home Appliance Industries in Isfahan. Irtiqa Imini Pishgiri Masdumiyat. 2022;10(2):108-15. &nbsp

The Effect of Stretching, Foam Rolling, and FIFA 11+ Warm-ups on Performance and Pain in Athletes with Knee Pain

Background: Patellofemoral pain syndrome (PFPS) is the most prevalent disease of the knee. The purpose of this study was to compare the acute effects of various warm-up methods on several performance measures and pain intensity in athletes with and without PFPS. Methods: This clinical trial study included 18 to 24-year-old professional female athletes with or without PFPS. Both groups performed warm-up protocols, including general stretching, foam rolling, and Federation Internationale de Football Association (FIFA) 11+ warm-up exercises in three test sessions simultaneously. The data collection procedure was implemented on three separate days in one week. Pain intensity was measured using the Visual Analogue Scale (VAS). Countermovement jump (CMJ) and squat jump (SJ) to measure the stretch-shortening cycle (SSC) and Landing Error Scoring System (LESS) were examined before and after each session.   Results: No significant difference was observed between the effect of different warm-ups in groups with and without PFPS regarding the use of the SSC (P = 0.185), while there were significant differences in the effect of various warm-up protocols on LESS (P < 0.001) and pain scores (P < 0.001).   Conclusion: Using the foam roller as a warm-up method can decrease the pain intensity in athletes with PFPS but may increase their LESS score. In addition, there was no difference in the effect of various warm-up methods on the SSC between athletes with and without PFPS. Finally, it seems that foam rolling should be used with more caution as a part of warming up in athletes with PFPS

Electromyography of scapular stabilizers in people without scapular dyskinesis during push-ups

Background: Push-up (PU) is widely considered an effective exercise to stabilize the scapular, especially if performed on unstable surfaces. However, available studies cover a wide range of exercise variations and differ according to exercise prescription, muscle selection and study design. Therefore, findings are contradictory, and conclusions for a proper application of the PU are difficult to draw. Objective: To synthesize the available literature on the changes in the activity of the periscapular muscles in individuals without scapular dyskinesis while performing different types of PU on unstable surfaces. Search procedure: Four online databases were searched from the earliest publications to 9 August 2023, using predefined keywords. Out of the 2,850 potential references identified in the primary search, 92 studies were reviewed in detail, of which 38 met the inclusion criteria and were included. Methodological quality was evaluated using a standardized form based on the Newcastle‒Ottawa scale for observational studies. Data combination was performed using CMA (v3), and the random-effects model was used to calculate the standardized mean difference (SMD) with a 95% confidence interval (CI). Results: The use of unstable surfaces in people without scapular dyskinesis led to increased activity of the upper trapezius during the PU (p = 0.017; I2 = 84.95%; SMD = 0.425 [95% CI 0.077, 0.773]) and knee PU (p = 0.023; I2 = 70.23%; SMD = 0.474 [95% CI 0.066, 0.882]) exercises and increased activity of the middle trapezius (MT) (p = 0.003; I2 = 64.50%; SMD = 0.672 [95% CI 0.225, 1.119]) and serratus anterior (SA) (p = 0.039; I2 = 4.25%; SMD = 0.216 [95% CI 0.011, 0.420]) muscles during the push-up plus (PUP) exercise. Conclusion: Using an unstable support base during PU does not necessarily increase the activity of all scapular stabilizers. The amount of muscle activity depends on the type of PU other than the type of support base. If an unstable surface is used, PUP exercise appears to be the most effective modality to increase the quality of training, improve performance, and prevent the occurrence of scapular dyskinesis due to the increase in the activity of the MT and SA muscles

Comparison of mechanical energy transfer during right-forward lunge between female amateur and professional badminton players

Abstract Background Regarding their skill levels, badminton players present different movement patterns during front and right lunging. The main objective of this study was to compare the mechanical energy transfers attributable to right-forward lunges between amateur and professional badminton players to study variations in mechanical efficiency at various skill levels. Method In this cross-sectional study, twenty female badminton players were recruited (Professional group n = 10 and Amateur group n = 10). The kinematics and kinetics of the lower extremities were recorded while performing right-forward lunges using Vicon motion capture and Kistler force plates. Mechanical energy expenditures (MEE) were extracted in eccentric transfer, concentric transfer, and no-transfer phases for the hip, knee, and ankle joints. At each joint, mechanical energy compensations (MEC) were also determined. Independent samples t-tests were used to analyze data at a significance level of α = 0.05. Result Regards to mechanical energy expenditures at the initial heel contact phase, the professional players demonstrated statistically significant more ankle no-transfer (p < 0.003), less knee concentric transfer (p < 0.026), more knee eccentric transfer (p < 0.001), and less hip no-transfer (p < 0.001). At the same time, the amateur athletes showed significantly more ankle eccentric transfer (p < 0.042) at maximal knee flexion angle time point. Analyzing mechanical energy compensation coefficients showed that the professional athletes had significantly less ankle concentric transfer (p < 0.001), more knee concentric transfer (p < 0.001), more knee eccentric transfer (p < 0.001), and more hip eccentric transfer (p < 0.001) at initial contact phase. While they found to have significantly more ankle eccentric transfer (p < 0.007), less knee concentric transfer (p < 0.001), less knee eccentric transfer (p < 0.001), more hip concentric transfer (p < 0.001), and more hip eccentric transfer (p < 0.001) at maximal knee flexion angle. Conclusion it is shown that the mechanical energy efficiency of the right-forward lunge is skill-related. It seems that altered lunge landing biomechanics may increase the risk of ankle and knee injuries and muscular damages in amateur athletes. It is recommended for amateur players to follow a injury prevention training program that promotes proper lunging technique

Altered Ultrasonographic Activity of Abdominal Muscles during Breathing in Males with and without Nonspecific Chronic Low Back Pain

Purpose This study aimed to investigate the altered ultrasonographic activity of abdominal muscles during breathing in males with and without nonspecifc chronic low back pain (NSCLBP). Design Cross-sectional study. Methods Twenty males with NSCLBP and 20 males without NSCLBP were recruited. Muscle thickness change was measured by ultrasonography during breathing in the end-inspiration and end-expiration phases for the transverse abdominis (TrA), internal oblique (IO), external oblique (EO), and rectus abdominis (RA) muscles. The data were normalized to the end-inspiration thickness. An independent t test was run to analyze the data at a confdence level of 95% (p<0.05). Results The participants with NSCLBP had thicker IO muscles in the end-inspiration (p =0.030) and end-expiration (p=0.017) phases as well as greater RA (p=0.006) and smaller EO (p=0.003) normalized thickness changes during breathing. Conclusion The normalized thickness changes during breathing difered between the participants with and without NSCLBP. Reduced EO and increased RA activity may predispose the spine to further injuries. Therefore, normalizing the breathing pattern should be considered in the management of people with NSCLBP. Keywords Low back pain · Abdominal muscles · Ultrasonography · Respiratio

Correlation between the Functional Movement Screen (FMS) Test with Dynamic Balance and Core Endurance in Male and Female Volleyball Players in Kerman Province

Introduction: Functional movement screen (FMS) test may be able to detect athletes who may be at risk of further injury by identification of muscle imbalances and movement impairment syndromes. The aim of this study was to examine the correlation between FMS test and dynamic balance and endurance of core muscles in male and female volleyball players. Materials and Methods: FMS test, the Y balance test and the McGill trunk endurance tests were employed in the present study to evaluate the quality of movement, dynamic balance and the core muscle endurance, respectively. Subjects voluntarily participated in the study for three consecutive days. The correlation coefficient was employed to investigate the relationship between variables. All statistical analyzes were carried out at confidence interval of 95% (P&lt;0.05). Results: 30 volleyball players (men=15, height 183/80±7/82 cm, Weight 74/93±9/58 kg) (Women=15, height 168/93±8/25 cm, Weight 58/13±9/41 kg). The results showed that there is only a significant correlation between the men's trunk flexor muscles and the left foot balance of the women's with functional movement test (P&lt;0.05). There was no significant relationship between other measured factors. Conclusion: Considering the results and limitations of the present study, it seems that the correlations between FMS scores and the core endurance and balance may be different between males and females; therefore, further studies are strongly recommended to clarify the issue.Keywords: Athletic Injuries, Lumbosacral Region, Muscle Fatigue, Risk Assessmen

Effects of telerehabilitation-based respiratory and corrective exercises among the elderly with thoracic hyper-kyphosis: a clinical trial

Abstract Background Aging is associated with changes in the musculoskeletal system, including increased susceptibility to spine malalignments. Utilizing corrective exercises with a therapeutic emphasis can be beneficial in the elderly with thoracic spine hyperkyphosis. Objective This study aimed to investigate the effects of six weeks of telerehabilitation-based respiratory and corrective exercises on quality of life, disability, thoracic kyphosis, craniovertebral angle, shoulder angle, cranial angle, and chest expansion in the elderly with thoracic spine hyperkyphosis. Methods In this clinical trial, a total of 40 participants aged 60 and above with thoracic hyperkyphosis were randomly divided into the control (N = 20) and experimental (N = 20) groups. The experimental group performed the corrective exercises for six weeks (3 sessions per week). The control group performed general stretching exercises during the same time period. We measured the outcomes of quality of life, disability, thoracic kyphosis, craniovertebral angle, shoulder angle, cranial angle, and lung expansion before and after the intervention. Analysis of covariance (ANCOVA) was employed to analyze the data. A P-value ≤ 0.05 was considered statistically significant. Results Quality of life (P < 0.001, Effect Size (ES): 0.44), chest expansion (P < 0.001, ES: 0.56), thoracic kyphosis angle (P < 0.001, ES: 0.31), craniovertebral (P < 0.001, ES: 0.33), cranial (P < 0.001, ES: 0.38), and shoulder (P = 0.005, ES: 0.20) angles were significantly improved in the experimental group as compared with controls. However, no statistically significant difference was observed between the two groups in terms of physical ability (P = 0.251, ES: 0.04). Conclusion It is therefore recommended that online corrective exercises be used in the rehabilitation protocol to improve the quality of life, posture, chest expansion, and disability in the elderly with thoracic kyphosis