scholarly journals Effects of muscular endurance training on musculoskeletal disorders in teachers

2015 ◽  
Vol 28 (3) ◽  
pp. 535-544
Author(s):  
Elisângela Valevein Rodrigues ◽  
Anna Raquel Silveira Gomes ◽  
Ana Tereza Bittencourt Guimarães ◽  
Bianca Drabovski ◽  
Rosana Rox ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Endurance Training ◽  
Repeated Measures ◽  
Goodness Of Fit ◽  
Peak Torque ◽  
Lower Limbs ◽  
Musculoskeletal Symptoms ◽  
Lumbar Region ◽  
Muscular Endurance ◽  
Goodness Of Fit Test

AbstractIntroduction Physical exercise is indicated to reduce the incidence of musculoskeletal symptoms in teachers.Objective To evaluate the effects of muscular endurance training on muscle strength and musculoskeletal symptoms related to the lower limbs of public elementary school teachers.Materials and methods Thirty-one female teachers were divided into two groups: control (CG, n = 15) and muscular endurance training (TG, n = 16). The training consisted of two sets of 15 repetitions of exercises for quadriceps and hamstring muscle groups, twice a week, for 7 weeks, which were conducted with 50% of 10 repetition maximum(10RM) (first to fourth week) and 60% of 10 RM (fifth to seventh week). Musculoskeletal symptoms (Nordic Musculoskeletal Questionnaire), isometric peak torque (Load cell) and muscle strength (10RM) were assessed before and after intervention. ANOVA for repeated measures and Tukey post hoc were used to analyse strength and peak torque of quadriceps and hamstrings and Chi-square goodness-of-fit test were used to analyse the frequency of occurrence of osteomuscular symptoms.Results The highest incidence of symptoms was found in the lumbar region in both groups. Training caused increased muscle strength of the quadriceps and hamstrings, but there were no significant differences in either the peak torque in the quadriceps and hamstrings or in the reduction of musculoskeletal symptoms.Conclusion The exercise program performed in this study increased the dynamic strength in the TG in relation to the CG, but did not alter the incidence of symptoms in the lumbar region and lower limbs in neither of the groups. Thus, results suggest that the duration of intervention may not have been enough to increase peak torque and decrease musculoskeletal symptoms.

scholarly journals Do neuromuscular adaptations occur in endurance-trained boys and men?

2010 ◽  
Vol 35 (4) ◽  
pp. 471-479 ◽  
Author(s):  
Rotem Cohen ◽  
Cam Mitchell ◽  
Raffy Dotan ◽  
David Gabriel ◽  
Panagiota Klentrou ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Endurance Training ◽  
Muscle Activation ◽  
Peak Torque ◽  
Metabolic Effects ◽  
Electromechanical Delay ◽  
Time To Peak ◽  
Neuromuscular Adaptations ◽  
Health Related ◽  
Isometric Torque

Most research on the effects of endurance training has focused on endurance training's health-related benefits and metabolic effects in both children and adults. The purpose of this study was to examine the neuromuscular effects of endurance training and to investigate whether they differ in children (9.0–12.9 years) and adults (18.4–35.6 years). Maximal isometric torque, rate of torque development (RTD), rate of muscle activation (Q30), electromechanical delay (EMD), and time to peak torque and peak RTD were determined by isokinetic dynamometry and surface electromyography (EMG) in elbow and knee flexion and extension. The subjects were 12 endurance-trained and 16 untrained boys, and 15 endurance-trained and 20 untrained men. The adults displayed consistently higher peak torque, RTD, and Q30, in both absolute and normalized values, whereas the boys had longer EMD (64.7 ± 17.1 vs. 56.6 ± 15.4 ms) and time to peak RTD (98.5 ± 32.1 vs. 80.4 ± 15.0 ms for boys and men, respectively). Q30, normalized for peak EMG amplitude, was the only observed training effect (1.95 ± 1.16 vs. 1.10 ± 0.67 ms for trained and untrained men, respectively). This effect could not be shown in the boys. The findings show normalized muscle strength and rate of activation to be lower in children compared with adults, regardless of training status. Because the observed higher Q30 values were not matched by corresponding higher performance measures in the trained men, the functional and discriminatory significance of Q30 remains unclear. Endurance training does not appear to affect muscle strength or rate of force development in either men or boys.

scholarly journals A INFLUÊNCIA DO EXCESSO DE PESO NA FORÇA MUSCULAR E NA FUNCIONALIDADE MULHERES JOVENS

2019 ◽  
Vol 8 (1) ◽  
pp. 250-262
Author(s):  
Pâmela Abreu Vargas Barbosa ◽  
Amanda Marques Faria ◽  
Daniella Alves Vento ◽  
Flávio Monteiro Ayres ◽  
Cibelle Kayenne Martins Roberto Formiga ◽  
...  
Keyword(s):  
Social Sciences ◽  
Muscle Strength ◽  
Young Women ◽  
Peak Torque ◽  
The Body ◽  
Lower Limbs ◽  
Cross Sectional ◽  
The Social ◽  
The Right ◽  
And Function

O objetivo foi verificar a influência do excesso de peso na força muscular e na funcionalidade de tronco de mulheres jovens. Estudo analítico transversal, com 54 mulheres de 18 a 30 anos, com excesso de peso (n=25), e eutróficas (n=29). A força muscular de tronco foi avaliada pelo dinamômetro isocinético e a funcionalidade de tronco e membros inferiores através do Bunkie Test. A análise dos dados foi realizada por meio do programa SPSS (Sciences Statistical Package for the Social Sciences). Como resultado, o presente estudo identificou que as mulheres com excesso de peso conseguem gerar pico de torque absoluto na 1º série (p=0,023), na 2º série (p=0,009), e no impulso na 2º série (p=0,009) maiores que as mulheres eutróficas. No entanto, quando o pico de torque foi analisado proporcionalmente ao peso corporal, estes valores foram menores, não sendo encontrada diferença entre os grupos (p0,05). Para o Bunkie Test, o grupo com excesso de peso apresentou pior desempenho na funcionalidade, principalmente nos movimentos de extensão, em decúbito dorsal, dos membros inferiores direito (p=0,011), esquerdo (p= 0,004) e na manutenção do tronco em decúbito lateral direito (p=0,008). Conclui-se que o excesso de peso pode alterar diretamente a força muscular e interferir na funcionalidade de tronco de mulheres jovens, sugerindo um desequilíbrio muscular em tronco e membros inferiores.Palavras-chave: Força Muscular. Obesidade. Funcionalidade. THE INFLUENCE OF OVERWEIGHT ON MUSCLE STRENGTH AND FUNCTION IN YOUNG WOMENABSTRACT: The aim of this study was to verify the influence of overweight on muscle strength and functionality in young women. This is a cross-sectional analytical study that was conducted with 54 women aged 18 and 30 years – twenty-five (25) were overweight and twenty-nine (29) were eutrophic. Muscle strength was assessed by an isokinetic dynamometer, whereas functionality was assessed by the Bunkie Test. Data analysis was performed using the SPSS program (Sciences Statistical Package for the Social Sciences). As a result, the present study identified that overweight women can generate absolute peak torque in the 1st grade (p = 0.023), in the 2nd grade (p = 0.009), and in the 2nd highest grade (p = 0.009) than eutrophic women. However, when the peak torque was analyzed proportionally to the body weight, these values were lower, and no difference was found between the groups (p 0.05). For the Bunkie Test, the overweight group presented worse performance in the functionality, especially in the extension movements, in the dorsal decubitus position, of the right lower limbs (p = 0.011), left (p = 0.004) and in the maintenance of the decubitus trunk right side (p = 0.008). It is concluded that overweight can directly affect muscle strength and interfere with the trunk function of young women, suggesting a muscle imbalance in the trunk and lower limbs.Keywords: Muscle Strength. Obesity. Functioning.

scholarly journals El entrenamiento de la resistencia y sus efectos en la competición en la altura en el fútbol ecuatoriano (Endurance training and its effects in competition at altitude in the Ecuadorian soccer)

Retos ◽  
2017 ◽  
pp. 221-227
Author(s):  
Manuel Gutierrez Cruz ◽  
Lisbet Guillen Pereira ◽  
Flavio Antonio Perlaza ◽  
José Ramón Guerra Santiesteban ◽  
Giovanny Capote Lavandero ◽  
...  
Keyword(s):  
Endurance Training ◽  
Goodness Of Fit ◽  
Technical Skills ◽  
Three Dimensions ◽  
Maximum Volume ◽  
Goodness Of Fit Test ◽  
Four Dimensions ◽  
Kolmogorov Smirnov ◽  
Student’S T ◽  
Smirnov Test

La investigación se realizó en el equipo de la reserva del Barcelona Sporting Club del fútbol ecuatoriano de primera división, cuyo objetivo se enfocó en validar una alternativa metodológica para el entrenamiento de la resistencia con vista a la competición en la altura, para ello se asumió un pre-experimento el cual permitió evaluar cuatro dimensiones, la primera relacionada con el conocimiento sobre el entrenamiento de resistencia para la competición en la altura; en este aspecto se trabajó con el cuerpo técnico del equipo. De igual forma intervino una muestra de 12 futbolistas seleccionados mediante un muestreo intencional, en esta se evaluaron tres dimensiones: la efectividad de las acciones ofensivas y defensivas, la segunda  analiza la cantidad de metros recorridos (Test de Cooper) y la tercera el VO2. Para el análisis estadístico de los datos se utilizó un test de bondad de ajustes (test de Kolmogorov-Smirnov: KS), los resultados permitieron aplicar un test paramétrico (T de Student). En cada una de las dimensiones analizadas los resultados arrojados fueron significativos siendo p=.000. Para el análisis estadístico se empleó el paquete SPSS 23.0. Los resultados del estudio demostraron como resultado de la aplicación de la propuesta un incremento en la efectividad en la utilización de la técnica para  crear y solucionar situaciones en los últimos 15 minutos de juego, en concordancia se observó  un mejor estado de las manifestaciones externas de la carga física y la capacidad de resistencia aerobia a partir del incremento del VO2.Summary: The research was carried out with the reserve team of Barcelona Sporting Club from the Ecuadorian soccer first division. The objective was to validate a methodological alternative for endurance training focused on competitions at altitude. The pre-experimental design of the study was directed to evaluating four dimensions. The first one concerned developing knowledge about endurance training for competitions at altitude; in this aspect, we worked with the technical staff of the team. In the same way, a sample of 12 players was selected using intentional sampling, three dimensions being evaluated: effectiveness of offensive and defensive actions; meters covered (Cooper test); and maximum volume of oxygen (VO2). Data analysis was based on goodness of fit test (Kolmogorov-Smirnov test [KS]). Data normality allowed to apply parametric tests (Student's T). Results were significant in each of the analyzed dimensions, being p = .000. SPSS 23.0 package was used for statistical analysis. Results of the implementation of the method demonstrated an increased effectiveness in using technical skills to create and solve situations in the last 15 minutes of the matches, at the same time as we could observe a better state of the external manifestations of physical load as well as improved capacity of aerobic endurance derived from the increase in VO2.

scholarly journals Strength training with repetitions to failure does not provide additional strength and muscle hypertrophy gains in young women

2017 ◽  
Vol 27 (2) ◽  
Author(s):  
Saulo Martorelli ◽  
Eduardo Lusa Cadore ◽  
Mikel Izquierdo ◽  
Rodrigo Celes ◽  
André Martorelli ◽  
...  
Keyword(s):  
Resistance Training ◽  
Muscle Strength ◽  
Young Women ◽  
Muscle Hypertrophy ◽  
Muscle Thickness ◽  
Peak Torque ◽  
Muscular Endurance ◽  
Short Term ◽  
Neuromuscular Adaptations ◽  
Repetitions To Failure

This study investigated the effects of a 10-week resistance training to failure on neuromuscular adaptations in young women. Eighty-nine active young women were randomly assigned to one of three groups: 1) repetitions to failure (RF; three sets of repetitions to failure); 2) repetitions not to failure with equalized volume (RNFV; four sets of 7 repetitions); and 3) repetitions not to failure (RNF; three sets of 7 repetitions). All groups performed the elbow flexor exercise (bilateral biceps curl) and trained 2 days per week using 70% of 1RM. There were significant increases (p<0.05) in muscle strength after 5 (15.9% for RF, 18.4% for RNF, and 19.9% for RNFV) and 10 (28.3% for RF, 26.8% for RNF, and 28.3% for RNFV) weeks of training, with no significant differences between groups. Additionally, muscular endurance increased after 5 and 10 weeks, with no differences between groups. However, peak torque (PT) increased significantly at 180°.s-1 in the RNFV (13.7%) and RNF (4.1%) groups (p<0.05), whereas no changes were observed in the RF group (-0.5%). Muscle thickness increased significantly (p<0.05) in the RF and RNFV groups after 5 (RF: 8.4% and RNFV: 2.3%) and 10 weeks of training (RF: 17.5%, and RNFV: 8.5%), whereas no significant changes were observed in the RNF group (3.9 and 2.1% after 5 and 10 weeks, respectively). These data suggest that short-term training of repetitions to failure do not yield additional overall neuromuscular improvements in young women.

scholarly journals Isokinetic Dynamometry and 1RM Tests Produce Conflicting Results for Assessing Alterations in Muscle Strength

2017 ◽  
Vol 56 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Paulo Gentil ◽  
Fabricio Boscolo Del Vecchio ◽  
Antonio Paoli ◽  
Brad J Schoenfeld ◽  
Martim Bottaro
Keyword(s):  
Resistance Training ◽  
Muscle Strength ◽  
Pearson Correlation ◽  
Young Men ◽  
Peak Torque ◽  
Lower Limbs ◽  
Upper Body ◽  
Isokinetic Dynamometry ◽  
Strength Assessment ◽  
Leg Press

AbstractThe purpose of this study was to compare strength gains in the lower limbs, assessed by one maximum repetition (1RM) and isokinetic peak torque (PT), in young men undergoing a resistance training (RT) program. Twenty-seven young men performed resistance training twice a week for 11 weeks. Training involved two exercises for the lower body, two for the upper body and one for the midsection performed with three sets of 8-12 repetitions to momentary muscle failure. Before and after the training period, participants performed the 1RM test in the 45° leg press and knee extension PT in isokinetic dynamometry. The Pearson correlation coefficient was used to assess the relationship between the changes in 1RM and PT, and the Bland-Altman test was performed to check for agreement between the strength changes of both tests. There were significant changes in 1RM and PT of 23.98% and 15.96%, respectively (p < 0.05). The changes in leg press 1RM were significantly higher than the ones in PT. The Bland-Altman analysis revealed that the tests were not equivalent. In conclusion, professionals and researchers involved in strength assessment should be aware that the results obtained by PT and 1RM are not equivalent when evaluating individual responsiveness and/or the efficacy of an intervention on muscle strength, as the results obtained show large variations and can be even conflicting.

Effects of 3 Infraspinatus Muscle Strengthening Exercises on Isokinetic Peak Torque and Muscle Activity

2019 ◽  
Vol 28 (3) ◽  
pp. 229-235 ◽  
Author(s):  
Il-young Yu ◽  
Dong-kyu Lee ◽  
Myoung-Joo Kang ◽  
Jae-seop Oh
Keyword(s):  
Muscle Strength ◽  
Muscle Contraction ◽  
Muscle Activity ◽  
Repeated Measures ◽  
External Rotation ◽  
Peak Torque ◽  
Deltoid Muscle ◽  
Repeated Measures Design ◽  
Infraspinatus Muscle ◽  
Main Effect

Context: The infraspinatus muscle plays a particularly important role in producing primary external rotation (ER) torque and dynamic stability of the shoulder joint. Previous studies have reported that prone external rotation with horizontal abduction (PER), side-lying wiper exercise (SWE), and standing external rotation (STER) were effective exercises for strengthening the infraspinatus. However, we do not have enough knowledge about changes in muscle strength and dynamic muscle activity in each exercise under dynamic conditions. Objective: To compare the ER muscle strength, muscle activity among exercise methods and between muscle contraction types during 3 different exercises. Design: Repeated measures design in which ER muscle strength and muscle activities data were collected from subjects under 3 exercise conditions. Setting: Outpatient clinic. Participants: A total of 15 healthy men with no shoulder, neck, or upper-extremity pain were participated. Intervention: The subjects performed 3 different exercises randomly in concentric and eccentric using a Biodex dynamometer at an angular velocity of 60°/s. Main Outcome Measures: The ER peak torque (PT) data was collected and surface electromyography was used to measure the activity of the infraspinatus and posterior deltoid muscles and infraspinatus to posterior deltoid muscle activity ratio. Results: There was significant main effect for muscle contraction type in ER PT (P < .05). The concentric PT was greater during PER (P < .05) and SWE (P < .05) compared with eccentric. The main effect for exercise was found in ER PT and muscle activity (P < .05). The ER PT and infraspinatus muscle activity were the largest increased during PER whereas the lowest during STER in both concentric and eccentric (P < .05). Conclusion: The results of this study suggest that PER is an exercise for strengthening the infraspinatus muscle effectively.

scholarly journals The effects of immersion cryotherapy on levels of muscle strength and power

2020 ◽  
Vol 19 (4) ◽  
pp. 283
Author(s):  
Andre Luiz Lopes ◽  
Júlia Da Silveira Gross ◽  
Renata Lopes Krüger ◽  
Gustavo Dos Santos Ribeiro ◽  
Régis Radaelli ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Lower Limb ◽  
Recovery Of Function ◽  
Peak Torque ◽  
Isometric Strength ◽  
Lower Limbs ◽  
Knee Extensors ◽  
Active Recovery ◽  
Cross Sectional ◽  
Fatigue Protocol

Aims: To verify the influence of immersion cryotherapy on isometric strength and lower limb power of athletes. Methods: Using a cross-sectional crossover design, 14 rugby athletes underwent three laboratory visits. The first visit was composed of anthropometric (mass, height, and body composition), aerobic capacity (cardiopulmonary exercise test), and dietary assessments. On the second and third visits, vertical jump and isometric peak torque of the knee extensors were assessed in three moments: 1) at baseline; 2) after fatigue protocol; and 3) after recovery protocol: active rest or immersion cryotherapy. Fatigue protocol was composed by running at a speed corresponding to 120% of VO2MAX until voluntary fatigue. To immersion cryotherapy, all subjects had their lower limbs immersed in a tank with ice and water (10 ± 1°C), remaining in the standing position for 10 minutes. For active recovery, subjects were standing in an empty tank. Data were analyzed on GraphPAD Prism (p<0.05). Results: Fourteen rugby athletes (age 22 ± 2 years; fat mass 27.8 ± 4.4%; VO2MAX 44.1 ± 6.7 ml.kg-1.min-1) were evaluated. There was no difference in caloric intake among the evaluation days (2,893 ± 802 versus 2,915 ± 746 kcal; p=0.949). Jump height reduced 18% after fatigue and immersion cryotherapy protocols (33.0 ± 2.8 versus 27.0 ± 2.8 cm; p<0.05) and a 7.1% increase after fatigue and active rest (32.5 ± 6.4 versus 34.8 ± 2.1 cm; p<0.05). Regarding the isometric peak torque, it was reduced by 3.7% after immersion cryotherapy (295 ± 71 versus 285 ± 68 Nm; p<0.05) and 9.6% after active rest (297 ± 73 versus 268 ± 72 Nm; p<0.05). Conclusion: Immersion cryotherapy seems to affect lower limb power albeit could assist in the recovery of isometric strength compared to passive recovery. This information is important to compose recovery protocols for specific tasks.Keywords: physical therapy specialty, cryotherapy, recovery of function, regeneration, muscle strength, athletic performance, exercise.

scholarly journals Assessment of the Multi-Location External Workload Profile in the Most Common Movements in Basketball

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3441
Author(s):  
Carlos D. Gómez-Carmona ◽  
Sebastián Feu ◽  
José Pino-Ortega ◽  
Sergio J. Ibáñez
Keyword(s):  
Lower Limb ◽  
Repeated Measures ◽  
Ad Hoc ◽  
Physical Conditioning ◽  
Lumbar Region ◽  
Basketball Players ◽  
Eta Squared ◽  
Subject Variability ◽  
Acceleration And Deceleration ◽  
Linear Movement

The present study analyzed the multi-location external workload profile in basketball players using a previously validated test battery and compared the demands among anatomical locations. A basketball team comprising 13 semi-professional male players was evaluated in five tests (abilities/skills/tests): (a) aerobic, linear movement, 30-15 IFT; (b) lactic anaerobic, acceleration and deceleration, 16.25 m RSA (c) alactic anaerobic, curvilinear movement, 6.75 m arc (d) elastic, jump, Abalakov test (e) physical-conditioning, small-sided game, 10’ 3 vs.3 10 × 15 m. PlayerLoadRT was evaluated at six anatomical locations simultaneously (interscapular line, lumbar region, knees and ankles) by six WIMU PROTM inertial devices attached to the player using an ad hoc integral suit. Statistical analysis was composed of an ANOVA of repeated measures and partial eta squared effect sizes. Significant differences among anatomical locations were found in all tests with higher values in the location nearer to ground contact (p < 0.01). However, differences between lower limb locations were only found in curvilinear movements, with a higher workload in the outside leg (p < 0.01). Additionally, high between-subject variability was found in team players, especially at lower limb locations. In conclusion, multi-location evaluation in sports movements will make it possible to establish an individual external workload profile and design specific strategies for training and injury prevention programs.

Sign in / Sign up

Export Citation Format

Share Document