Reliability of Isometric Muscle Strength Measurement and Its Accuracy Prediction of Maximal Dynamic Force in People with Multiple Sclerosis.

Background and Objectives: Multiple sclerosis (MS) is a disease that manifests with varied neurological symptoms, including muscle weakness, especially in the lower extremities. Strength exercises play an important role in the rehabilitation and functional maintenance of these patients. The individualized prescription of strength exercises is recommended to be based on the maximum force determined by the one-repetition maximum (1RM), although to save time and because it requires less equipment, it is often determined by the maximum voluntary isometric contraction (MVIC). The purpose of this work was to study, in patients with MS (pwMS), the reliability of MVIC and the correlation between the MVIC and 1RM of the knee extensors and to predict the MVIC-based 1RM. Materials and Methods: A total of 328 pwMS participated. The study of the reliability of MVIC included all pwMS, for which MVIC was determined twice in one session. Their 1RM was also evaluated. The sample was randomized by MS type, sex, and neurological disability score into a training group and a testing group for the analysis of the correlation and prediction of MVIC-based 1RM. Results: MVIC repeatability (ICC, 2.1 = 0.973) was determined, along with a minimum detectable change of 13.2 kg. The correlation between MVIC and 1RM was R2 = 0.804, with a standard error estimate of 12.2 kg. The absolute percentage error of 1RM prediction based on MVIC in the test group was 12.7%, independent of MS type and with no correlation with neurological disability score. Conclusions: In patients with MS, MVIC presents very good intrasubject repeatability, and the difference between two measurements of the same subject must differ by 17% to be considered a true change in MVIC. There is a high correlation between MVIC and 1RM, which allows estimation of 1RM once MVIC is known, with an estimation error of about 12%, regardless of sex or type of MS, and regardless of the degree of neurological disability.

Perfil antropométrico, somatotipo y estado nutricional del taekwondoín mexicano / Anthropometric profile, somatotype and nutritional status of Mexican taekwondoin

RESUMEN: El perfil antropométrico y el somatotipo son herramientas imprescindibles para monitorizar el rendimiento morfológico del atleta de alto rendimiento. El objetivo del presente estudio es la descripción del perfil antropométrico y el somatotipo dominante de atletas mexicanos de taekwondo (TKD) de alto rendimiento. El perfil antropométrico y el somatotipo fueron determinados en 16 atletas de TKD mexicanos [8 hombres, edad media 21,5 años (19,8-23,0, IC 95%); 8 mujeres, edad media 21,9 años (19,2-24,4, IC 95%)]. Una prueba T-Student para muestras independiente fue usada para comparar las medias entre ambos sexos (Hombres vs Mujeres). La estatura (P = 0,001), los pliegues del muslo anterior (p = 0,006) y pantorrilla (p = 0,049), la circunferencia del brazo flexionado (p = 0,047), los diámetros del húmero (p = 0,011) y fémur (p = 0,012), el área total y área muscular del brazo (p = 0,001) fueron significativamente diferentes entre hombres y mujeres. Un somatotipo ecto-mesomórfico predomino tanto en hombres (2,1-3,2-4,2) como en el grupal (2,4-3,1-3,8), pero ectomorfo-mesomórfico (2,8-3,2-3,4) para las mujeres. El somatotipo del atleta de TKD mexicano predominó por una mayor linearidad relativa seguido de una magnitud musculoesquelética y una menor adiposidad relativa. Los hallazgos de este estudio aportan evidencias morfológicas para monitorizar el rendimiento físico y nutricional del atleta de TKD.

SUMMARY: Body composition, somatotype and nutritional status are essential tools for monitoring the perfor- mance of high-performance athlete. The objective of the present study was to verify the body composition, the dominant somatotype and nutritional status of high-performance taekwondo athletes of the Mexican TKD team. The anthropometric profile, somatotype and nutritional status were determined in sixteen Mexican TKD athletes [8 men, mean age 21.5 yrs. (19.8-23.0 95% CI); 8 women, mean age 21.9 yrs. (19.2-24.4 95% CI)]. An independent-samples t-test was used to compare the means between both genders (Men vs. Women). The height (p = 0.001), the anterior thigh (p = 0.006) and calf (p = 0.049) folds, the flexed arm circumference (p = 0.047), the humerus (p = 0.011) and femur (p = 0.012) diameters, the fat free mass (p = 0.020) and arm total area (p = 0.049) and arm muscle area (p = 0.001) were significantly different between men and women. The percentage of body fat and arm fat area were not significant between both genders. A normal caloric reserve, but a slightly high percentage of body fat was observed for both genders. In addition, normal and high protein reserves were identified for men and women, respectively. An ecto-mesomorphic somatotype was highlighted in both men (2.1-3.2-4.2) and in the group (2.4-3.1-3.8), but ectomorphic- mesomorphic (2.8-3.2-3.4) to women. The somatotype of the Mexican TKD athlete predominated by a greater relative linearity followed by a musculoskeletal magnitude and a lower relative adiposity. The findings of this study provide morphological evidence to monitor the physical and nutritional performance of the high-performance TKD athlete.

Calidad de vida familiar y TDAH infantil: perspectiva multidisciplinar desde la educación física y el trabajo social / Quality of family life and childhood ADHD: multidisciplinary perspective from physical education and social work

RESUMEN: La familia ha sido considerada el contexto social que más influencia ejerce para la formación y desarrollo de cualquier individuo. El objetivo de este trabajo es destacar la importancia de la calidad de vida de las familias que experimentan la presencia de un integrante con Trastorno por Déficit de Atención e Hiperactividad (TDAH) y cómo, desde las áreas profesionales de educación física y trabajo social, se puede plantear una propuesta para su tratamiento integral. Para ello, se revisan diversos estudios publicados en los últimos años, analizando las diferentes formas en las que han abordado la calidad de vida en el contexto familiar. Se espera que el análisis de estos aportes incite en la innovación y promoción de nuevas formas de abordar la calidad de vida familiar en infantes con TDAH.

ABSTRACT: Family has been identified as the most influential social context for the formation and development of any individual. The objective of this work is to highlight the importance of the quality of life of families that experience the presence of a member with attention deficit hyperactivity disorder (ADHD) and through the professional areas of physical education and social work, an approach for its comprehensive treatment is given. To do this, several studies published in recent years were reviewed, analyzing the different ways in which they have addressed the quality of life in the family context. The analysis of these contributions is expected to influence the innovation and promotion of new ways by addressing the quality of family life in infants with ADHD.

Efectos de un programa de entrenamiento físico de 16 semanas sobre el peso, el IMC y la aptitud física en cadetes / Effects of a 16-week physical training program on weight, BMI and physical fitness in cadets / Efeitos de um programa de treinamento físico de 16 semanas sobre peso, IMC e condicionamento físico em cadetes

OBJETIVO: Evaluar los efectos de un programa de entrenamiento físico de 16 semanas sobre el peso, el IMC y la aptitud física en cadetes. MÉTODO: Cincuenta cadetes pertenecientes al Instituto Estatal de Ciencias Penales y Seguridad Pública del Estado de Sinaloa (México) fueron divididos en dos grupos: grupo de ejercicio (n = 36, media de 26.1 años) y grupo control (n = 14 media, de 26.7 años). Se determinaron el peso y el Índice de Masa Corporal como medida corporal y el Consumo Máximo de Oxígeno, fuerza abdominal, flexo-extensión del codo y velocidad en 40m. para la aptitud física. Se realizaron evaluaciones antes y después de un programa de entrenamiento físico de 16 semanas. RESULTADOS: Los cadetes presentaron aceptables ganancias en el Consumo Máximo de Oxígeno, fuerza abdominal, fuerza flexo-extensora del codo y velocidad de carrera tras el entrenamiento, pero el peso y el Índice de Masa Corporal pesar que se obtuvieron mejoras tras el periodo de entrenamiento estas mejoras no difieren significativamente del grupo control. El grupo control no mostró cambios en ninguna variable estudiada. CONCLUSIONES: Un programa de entrenamiento físico de 16 semanas mejora todos los componentes de la aptitud física, pero el peso y el Índice de Masa Corporal presentaron ligeras modificaciones

OBJECTIVE: To assess the effects of a 16-week physical training program on weight, Body Mass Index and physical fitness in cadets. METHOD: Fifty cadets belonging to the State Institute of Criminal Sciences and Public Security of the State of Sinaloa (Mexico) divided into two groups: exercise group (n = 36, mean of 26.1 years) and control group (n = 14, mean of 26.7 years). Weight and Body Mass Index were measured as body measurements and Maximal Oxygen Uptake, abdominal strength, flexion-extension of the elbow and speed in 40m. for physical fitness. Evaluations were conducted before and after a 16-week physical training program. RESULTS: The cadets had acceptable gains in Maximal Oxygen Uptake, abdominal strength, flexion-extensor elbow strength and running speed after training, but the weight and the Body Mass Index, although improvements were obtained after the training period, these improvements do not differ significantly from the control group. The control group did not show changes in any variable studied. CONCLUSIONS: A 16-week physical training program improved all components of physical fitness, but the weight and the Body Mass Index showed slight modifications

OBJETIVO: Avaliar os efeitos de um programa de treinamento físico de 16 semanas sobre peso, Índice de Massa Corporal e aptidão física em cadetes. MÉTODO: Cinquenta cadetes pertencentes ao Instituto Estadual de Ciências Criminais e Segurança Pública do Estado de Sinaloa (México) divididos em dois grupos: grupo de exercícios (n = 36, média de 26.1 anos) e grupo de controle (n = 14, média de 26.7 anos). Peso e Índice de Massa Corporal foram medidos como medidas corporais e Máxima Absorção de Oxigênio, força abdominal, flexo-extensão do cotovelo e velocidade em 40m. para aptidão física. As avaliações foram realizadas antes e depois de um programa de treinamento físico de 16 semanas. RESULTADOS: Os cadetes tiveram ganhos aceitáveis de Máxima Absorção de Oxigênio, força abdominal, força de flexão-extensor do cotovelo e velocidade de corrida, mas pequenas melhorias no peso e no Índice de Massa Corporal após o programa de treinamento após o treinamento, mas o peso e o Índice de Massa Corporal, embora as melhorias tenham sido obtidas após o período de treinamento, essas melhorias não diferem significativamente do grupo controle. CONCLUSÕES: Um programa de treinamento físico de 16 semanas melhorou todos os componentes da aptidão física, mas o peso e o Índice de Massa Corporal mostraram pequenas modificações

Reference Values for Isometric, Dynamic, and Asymmetry Leg Extension Strength in Patients with Multiple Sclerosis.

Having recognized the value of resistance training in patients with multiple sclerosis (PwMS), there are a lack of lower limb normative reference values for one repetition maximum (1RM) and maximal voluntary isometric contraction (MVIC) in this population. Hence, the purposes of this study were to provide reference values for 1RM and MVIC of knee extensors in PwMS across the disability spectrum and to examine knee extension strength asymmetry. Three hundred and ninety PwMS participated in the study, performing MVIC and 1RM tests of bilateral (both legs together at once) and unilateral (each leg singly) knee extensors. There was no difference in 1RM according to the disease course of MS, but there was according to the degree of neurological disability, being more preserved in those with a lower degree of disability. MVIC tends to be higher in patients with relapsing-remitting MS respect those with progressive MS, and in patients with lower levels of neurological disability. Asymmetry above the values considered normal in 1RM was present in 20-60% of patients and 56-79% in the MVIC test, depending on the type of MS and tended to be lower in those with less disability. Reference values are given by quartiles for 1RM, MVIC, and asymmetry.

Calidad de vida de pacientes con depresión leve o moderada en México / Quality of life in patients with mild or moderate depression in Mexico

OBJETIVO: Identificar las características generales por género y grado de sobrepeso y obesidad y su afectación sobre la calidad de vida de pacientes con leve y moderada depresión en Sinaloa México. MATERIAL Y MÉTODOS. Se realizó un estudio de corte transversal con 182 pacientes con diagnósticos depresivos de leve a moderado. La muestra se caracterizó por género y grado de sobrepeso y obesidad, y se determinó su impacto y asociación sobre la calidad de vida. La calidad de vida se determinó con la encuesta SF-36. RESULTADOS. Se encontraron diferencias significativas entre los pacientes con depresión leve y moderada (p=0.000). El rol físico se vio afectado significativamente por el género (p=0.047), mientas que la función física (p=0.016) y dolor (p=0.040) por el grado de sobrepeso y obesidad en pacientes con depresión leve. Además, se encontraron correlaciones significativas entre la función física y el dolor con el rol físico, salud general y vitalidad. CONCLUSIONES: La depresión leve afectó las dimensiones de la calidad de vida de función física, dolor y rol físico. La depresión y las dimensiones de función física y dolor se ven afectadas por el grado de sobrepeso y obesidad en los pacientes con leve depresión.

OBJECTIVE: To identify the general characteristics by gender and degree of overweight and/or obesity and its effect on the quality of life of patients with mild and moderate depression in Sinaloa, Mexico. MATERIAL AND METHODS. A cross-sectional study was conducted with 182 patients with mild to moderate depressive diagnoses. The sample was characterized by gender and degree of overweight and/or obesity, and its impact and association on quality of life were determined. Quality of life was determined with the SF-36 survey. RESULTS: Significant differences were found between patients with mild and moderate depression (p = 0.000). Physical role was significantly affected by gender (p = 0.047), while physical function (p = 0.016) and pain (p = 0.040) by the adegree of overweight and/or obesity in patients with mild depression. Furthermore, significant correlations were found between physical function and pain with physical role, general health and vitality. CONCLUSIONS: Mild depression affected the quality of life dimensions of physical function, pain, and physical role. Depression and the dimensions of physical function and pain are affected by the degree of overweight and/or obesity in patients with mild depression

Overweight or Obesity, Gender, and Age Influence on High School Students of the City of Toluca's Physical Fitness.

MATERIAL AND METHOD: This is a prospective, cross-sectional, and correlational study with a probabilistic sampling in which 150 teenagers from three different high schools from the city of Toluca, Mexico, aged 15-17, were assessed. OBJECTIVE: To determine if weight, age, and gender have an influence on physical fitness evaluated with the EUROFIT and ALPHA-FITNESS batteries. RESULTS: Women have a higher overweight and obesity rate than men (3 : 1). Adolescents who have normal weight have regular physical fitness (74.9%). When comparing genders we found that men have a higher mean than women in the tests, except for skinfold thickness and waist circumference. Age was only correlated with the plate tapping test (p = 0.001). There are significant differences in the standing broad jump test and the Course-Navette of the EUROFIT and ALPHA-FITNESS batteries (p = 0.000). CONCLUSIONS: It is likely that regular physical activity, and not normal weight, helps generate healthy physical fitness. Male subjects had a higher mean than women, reporting a better physical fitness and more frequent physical activity.

Effects of high-speed power training on muscle strength and power in patients with multiple sclerosis.

This study examined the effects of a high-speed power training program in peak muscle power and maximal voluntary isometric contraction (MVIC) of knee extensors in patients with relapsing-remitting multiple sclerosis (MS). Forty patients, 20 women (age 42.8 +/- 10.3 yr) and 20 men (age 44.0 +/- 8.7 yr) diagnosed with relapsing-remitting MS were randomly assigned, with respect to sex, to either an exercise group or a control group. Participants from the exercise group performed 12 wk of supervised muscle power training of knee extensors. All subjects were tested for MVIC and peak muscle power at baseline and after the training intervention. A strain gauge was used to measure the MVIC, and peak muscle power was assessed with a linear encoder at five relative loads. The training-related effects were assessed using a t-test. The results showed no significant changes in the control group from baseline to postintervention evaluation. In contrast, the exercise group significantly increased MVIC (10.8%; p < 0.05) and muscle power at 40, 50, 60, 70, and 80% of the MVIC by 21.8, 14.5, 17.3, 19.4, and 22.3%, respectively (p < 0.01), after the training. These findings suggest that 12 wk of high-speed power training improve both MVIC and muscle power at five different loads in patients with relapsing-remitting MS.

Effects of a 4-week eccentric training program on the repeated bout effect in young active women.

The aim of this study was to analyze the responses of women to the repeated bout effect (RBE) and to a short eccentric training program. Twenty-four young females were randomly assigned to a training group (TG, n = 14) or a control group (CG, n = 10). They performed two identical acute eccentric bouts (120 repetitions at 70% of 1RM) in a leg-press device in an 8 weeks interval. TG followed a 4-week-eccentric-training program between the bouts. Maximal isometric contraction, range of motion, peak power and quadriceps muscle soreness were compared between and within groups before and after the two acute eccentric bouts. TG and CG presented significant losses of isometric strength and peak power, and an increment in soreness after the first bout. Isometric strength and peak power were recovered faster in CG after the second bout (p < 0.05) compared with TG, which showed a similar recovery of these parameters after the second bout compared with the first one. A decrease in soreness and a faster recovery of range of motion were found in TG (p < 0.05) following the second bout compared with the first one, but not in CG. Data indicate that a 4-week eccentric training program may prevent the RBE over those adaptations related with muscle damage (e.g. strength loss), but it may increase RBE impact on inflammatory processes (e.g. soreness). Key pointsAn acute bout of eccentric exercise induces losses of strength, peak power and range of motion, and increases muscle soreness in young active women.When the acute eccentric bout is repeated by young women, the losses of strength and power are smaller, indicating less muscle damage. However, muscle pain and range of motion do not present any difference with the results obtained after the first bout, which would indicate that the repeated bout effect does not affect inflammatory response after acute eccentric exercise.Four weeks of eccentric training is enough to increase maximal isometric strength, but not dynamic strength (1RM) or peak power. Furthermore, this training seems to prevent those adaptations provided by the repeated bout effect related with muscle damage. On the other hand, the eccentric training seems to be a positive tool to decrease muscle soreness, and thus the inflammatory response, associated to a repeated acute eccentric bout.