The main objective of this study was to test the relationship between shoulder internal rotation strength and standing throwing velocity. A repeated measures cross-sectional study was conducted with ...20 professional handball players (mean ± SD; age: 19.28 ± 2.55 years, weight: 81.52 ± 9.66 kg, height: 185 ± 6 cm, BMI: 23.74 ± 1.69). The participants were instructed to perform eight standing throws from the 7 m line of the handball court at maximum velocity to calculate the mean and maximum throwing velocity. An incremental test was performed to calculate the repetition maximum (1-RM) of internal rotation shoulder strength. A Pearson's correlation analysis with a 95% confidence interval (95% CI) was performed to determine whether correlations existed between dominant arm internal rotation strength characteristics and maximum and mean ball-throwing velocity. There is no correlation between the internal rotation strength of the throwing shoulder and the velocity of the ball in the standing handball throw.
The aim of this study was to compare the effects of sit-to-stand (STS) training programs with 5
. 10 repetitions on muscle architecture and muscle function in sedentary adults. Sixty participants ...were randomly assigned into three groups: five-repetition STS (5STS), 10-repetition STS (10STS), or a control group (CG). Participants performed three sets of five or 10 repetitions of the STS exercise three times per week for 8 weeks. Before and after 8 weeks, all groups performed ultrasound measures to evaluate muscle thickness (MT), pennation angle (PA), and fascicle length (FL), and the five-repetition STS test to estimate the relative STS power and muscle quality index (MQI). After 8 weeks, both experimental groups improved MQI (40-45%), relative STS power (29-38%), and MT (8-9%) (all
< 0.001; no differences between the 5STS
. 10STS groups). These improvements in both groups resulted in differences regarding the CG, which did not present any change. In addition, only the 5STS group improved PA (15%;
= 0.008) without differences to the 10STS and CG.This suggests that STS training is time-effective and low-cost for improving muscle function and generating adaptations in muscle architecture.
Background The use of a functional electromechanical dynamometer (FEMD) has been proposed as a valid and effective tool to evaluate specific movement patterns. The aim of this study was to determine ...the reliability of FEMD on swing eccentric hamstring exercise (SEHE) measures in soccer players. Methods Nineteen federated male soccer players (20.74 ± 4.04 years) performed the SEHE at three different isokinetic velocities (20-40-60 cm/s). These evaluations were conducted in four sessions, two for familiarization and two for registration. The average and maximum load (N) of the three isokinetic velocities was calculated from the values obtained from the FEMD (Dynasystem.sup.® , Bangalore). Results The main results of this research showed that the reliability was high for the average load in the condition of 40 cm/s, presenting the highest ICC value (0.94). For maximum load, reliability was high in the condition of 20 cm/s. The manifestation of the most reliable load was the maximum load (ICC = 0.91-0.87). Conclusions FEMD (Dynasystem.sup.® , Bangalore) is a reliable device to evaluate the eccentric strength of the hamstring muscles in soccer players.
The purpose of this systematic review was to determine the effect of antioxidant consumption on markers of oxidative stress and muscle damage after performing a muscle strength exercise.
The ...Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) statements were followed. Four databases were used: Scopus, PubMed, WOS and SportDiscus. Methodological quality was assessed using the PEDro scale.
A total of 1709 articles were retrieved and following duplicate removal and application of exclusion criteria seven articles were reviewed. Supplementation with pomegranate juice alleviates oxidative stress, taurine reduces muscle damage, melatonin protects the skeletal muscles, blueberries decrease oxidation and oats mitigate muscle damage.
Acute administration of antioxidants immediately before or during an exercise session can have beneficial effects, such as delay of fatigue and a reduction in the recovery period. Administration of antioxidant susbtances may reduce muscle damage and oxidative stress markers.
Background: A method to assess the influence of sex and side testing on trunk rotator muscles has not been described. The purpose was to analyze the influence of sex and dominant and non-dominant ...sides (DS-NDS) on the reliability of two trunk rotator exercises and to study the relationship between the DS-NDS of two trunk rotator strength exercises. Methods: The reliability of the horizontal cable woodchop (HCW) and low cable woodchop (LWC) exercises was studied using a test-retest design with 51 physically active students. Isokinetic and isometric strength were assessed with a functional electromechanical dynamometer. Results: There were significant differences in reliability between male and female HCW and no significant differences in reliability between the average of the DS-NDS in HCW and LCW. There were no significant differences between the DS-NDS in the sex of HCW, and the strength of the two exercises showed no significant differences except for two conditions assessed. Very large to extremely large correlations were observed between sides in the strength of two exercises (r = 0.71–0.91). Conclusions: This test is handy for physical trainers or coaches to know the strength of the trunk rotators of their athletes.
El propósito de esta investigación es estudiar la aplicabilidad de la percepción subjetiva del esfuerzo (PSE) desde una doble perspectiva, en primer lugar, como apoyo al seguimiento de la ...cuantificación de la carga administrada en los entrenamientos en deportes colectivos, y en segundo lugar, como herramienta ad hoc para el control diario del entrenamiento sobre lo planificado por el cuerpo técnico. La frecuencia cardiaca de reserva (FCR) ha sido utilizada para controlar la carga interna de cada sesión. Trece jugadores pertenecientes a un equipo de balonmano de División de Honor española participaron en la investigación llevada a cabo a lo largo de una temporada. Los resultados mostraron que la PSE es un buen indicador de la carga de entrenamiento, consiguiéndose además un procedimiento válido para comparar valores de la carga planificada por el equipo técnico (PSEp) con respecto a los valores reales de entrenamiento (PSEg) (rxy = 0,792). Se puede concluir que la PSE junto a la FCR (rxy = 0,839) son buenos marcadores para el control de la carga de entrenamiento, no invasivos, y permiten monitorizar los estados de forma de los jugadores a lo largo de la temporada.
Cuando se realizan valoraciones de cualquier protocolo de evaluación uno de los aspectos fundamentales es conocer la validez y fiabilidad de los dispositivos utilizados. El objetivo del presente ...trabajo fue analizar la validez y fiabilidad de la variable de velocidad en el rango isocinético (VRI) en el dispositivo Haefni Health (HHe 1.0). Un total de dos protocolo se diseñaron para el análisis de la validez y fiabilidad. Los resultados mostraron altos Índices de Correlación Intraclase (ICC2,1) para las medidas de validez y fiabilidad del dispositivo (0,998 y 0,99, respectivamente). Cuando se analizó la fiabilidad de las medidas por cada una de las condiciones de evaluación altos ICC2,1, además de bajos CV y SEM fueron encontraros (rango 0,71-0,99, rango 0,19-3,73 y rango 0,001-0,004 m·s-1, respectivamente). Los resultados obtenidos avalan la validez y fiabilidad del dispositivo Haefni Health HHe1.0 para la medición de la variable de VRI tanto para la fase concéntrica como para la fase excéntrica del movimiento.
The regular practice of physical activity contributes to weight control and improves maximal oxygen uptake (VO2max), socialization and quality of life.
To determine the effect of moderate-to-vigorous ...physical activity on body composition and VO2max in a group of overweight school-age males.
We studied fifty-five overweight males aged 15.6 ± 0.7 years. Participants were divided in two groups (experimental and control groups). The intervention in the experimental group was the practice of small-sided games during 60 minutes, two days per week and during 11 weeks. At baseline and the end of the intervention, body composition was measured using bioimpedance and VO2max was calculated using the Course Navette test.
A 7% reduction in the percentage of body fat and a 9% increase in VO2max were observed in the experimental group (p < 0.01). No changes were recorded in the control group.
Eleven weeks of small-sided exercises performed twice per week increased VO2max and reduced fat mass in overweight adolescents.
When rating any assessment protocol one of the key issues is to determine the validity and reliability of the devices used. The aim of this study was to analyze the validity and reliability of the ...variable velocity isokinetic range (VRI) in Haefni Health System (HHe 1.0). Two assessment protocols were design to test bot, validity and reliability. The results showed high Index of Intraclass Correlation (ICC^sub 2,1^) for measures of validity and reliability of the VRI (0,998 and 0,99, respectively). Moreover, when the reliability was assessed at each criterion velocity high values of ICC^sub 2,1^, range 0,71-0,99 and low CV and SEM, range 0,19-3,73% and range 0.001-0.004 m*s^sup -1^, were found respectively. The results obtained confirm the validity and reliability of HHe1.0 device for measuring VRI variable.
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