Comparison between multiple sets and half-pyramid resistance exercise bouts for muscle damage profile

The present study compared the changes in markers of muscle damage after bouts of resistance exercise employing the Multiple-sets (MS) and Half-pyramid (HP) training systems. Ten healthy men (26.1 +/- 6.3 years), who had been involved in regular resistance training, performed MS and HP bouts, 14 days apart, in a randomised, counter-balanced manner. For the MS bout, participants performed three sets of maximum repetitions at 75%-1RM (i.e. 75% of a One Repetition Maximum) for the three exercises, starting with the bench press, followed by pec deck and decline bench press. For the HP bout, the participants performed three sets of maximum repetitions with 67%-1RM, 74%-1RM and 80%-1RM for the first, second and third sets, respectively, for the same three exercise sequences as the MS bout. The total volume of load lifted was equated between both bouts. Muscle soreness, plasma creatine kinase (CK) activity, myoglobin (Mb) and C-reactive protein (CRP) concentrations were assessed before and for three days after each exercise bout, and the changes over time were compared between MS and HP using two-way repeated measures ANOVA. Muscle soreness developed significantly (P<0.01) after both bouts, but no significant difference was observed between MS and HP. Plasma CK activity and Mb concentration increased significantly (P<0.01) without significant differences between bouts, and CRP concentration did not change significantly after either bout. These results suggest that the muscle damage profile is similar for MS and HP, probably due to the similar total volume of load lifted.

Efeito da intensidade do exercício de força sobre a ocorrência da dor muscular de início tardio

O objetivo do presente estudo foi verificar o efeito da intensidade do exercício de força sobre a percepção de dor muscular de início tardio (DMIT). A fim de investigar a hipótese que a intensidade determina o nível de DMIT, foram selecionados 40 homens saudáveis, iniciantes no treinamento de força, que, posteriormente, foram submetidos a duas sessões de treinamento realizadas com intensidades distintas (50%-1RM (n=20) e 75%-1RM (n=20)). A DMIT foi analisada por meio da escala analógica visual, 24, 48 e 72h após cada sessão de treinamento. A DMIT apresentou aumento significante em ambas as sessões (50%-1RM e 75%-1RM) (p<0,05), atingindo o pico em 48h (p<0,05). Entretanto, a DMIT não apresentou diferença entre as sessões (50%-1RM vs. 75%-1RM) (p>0,05). Os resultados desse estudo sugerem que a intensidade não parece ser um fator determinante para a magnitude da DMIT, quando o volume total de carga levantada na sessão de treinamento é equalizado.

Confronto fra periodizzazione Tradizionale e a Blocchi per l’allenamento della forza in atleti maschi e partecipanti di genere femminile.

La prima parte dello studio riguarda la descrizione dell’origine e delle caratteristiche che differenziano la periodizzazione tradizionale e quella a blocchi per l’allenamento della forza. L’obiettivo della seconda parte del lavoro è stato quello di confrontare gli adattamento ormonali e prestativi ad un programma di allenamento della forza periodizzato secondo il modello tradizionale o secondo quello a blocchi in un campione di atleti di forza. Venticinque atleti maschi sono stati assegnati con procedura randomizzata al gruppo con programmazione tradizionale (TP) o a quello a blocchi (BP). Prelievi di saliva sono stati effettuati prima e dopo 6 diverse sedute di allenamento durante il programma al fine di rilevare i livelli di testosterone (T) e cortisolo (C). Le valutazioni dei parametri antropometrici e prestativi sono state effettuate prima e dopo le 15 settimane di allenamento previste. In nessuno dei due gruppi vi sono state variazioni significative nei livelli ormonali. I risultati indicano che il gruppo BP ha ottenuto incrementi superiori a quello TP riguardo alla forza massima (p = 0,040) ed alla potenza (p = 0,035) espressa alla panca piana. Nella terza parte dello studio, la periodizzazione tradizionale e quella a blocchi sono state confrontate riguardo agli effetti sulla forza massima e sull’ipertrofia in donne allenate di livello amatoriale. Diciassette donne hanno partecipato all’esperimento allenandosi 3 volte a settimana per 10 settimane. I risultati dimostrano che entrambe le periodizzazioni hanno portato a miglioramenti significativi di forza e potenza; il gruppo TP ha tuttavia ottenuto incrementi superiori di forza massima (p = 0,039) e ipertrofia degli arti inferiori (p = 0,004). La periodizzazione tradizionale quindi si è dimostrata più efficace per aumentare la forza massima e la sezione muscolare della coscia in partecipanti di genere femminile. I risultati contrastanti nei due generi potrebbero essere legati a rapporti diversi fra processi anabolici e catabolici.

A Case Study of Muscular Strength, Endurance, and Power Responses to a 6-Week High Intensity Training Program

We evaluated the muscular strength, endurance, and power responses of 12 college students, ranging in age from 19-40 years, who participated in a 6-wk high-intensity training program commonly used to improve muscular endurance. Muscular strength was measured by a one repetition maximum (1RM) bench press test and a 1RM Hammer bench press test; muscular endurance was measured by administering a 70-percent 1RM test to failure on the Hammer bench press; and upper body power was measured by adminstering a medicine ball throw test. We observed a 4.8-percent improvement of 2.7 kg on the bench press, a 14.6-percent improvement of 10.5 kg on the Hammer bench press, a 45.5-percent improvement with an average increase of five repetitions on the submaximal test to failure and an average improvement of ~ 20 percent, 60 cm, for the medicine ball throw. Foe our subjects, a commonly used high-intensity training muscular endurance program resulted in improved performance on tests measuring muscular strength, endurance, and power, and resulted in zero reported injuries during training or assessment procedures.

1RM prediction: a data mining case study

In the last few years there has been a heightened interest in data treatment and analysis with the aim of discovering hidden knowledge and eliciting relationships and patterns within this data. Data mining techniques (also known as Knowledge Discovery in Databases) have been applied over a wide range of fields such as marketing, investment, fraud detection, manufacturing, telecommunications and health. In this study, well-known data mining techniques such as artificial neural networks (ANN), genetic programming (GP), forward selection linear regression (LR) and k-means clustering techniques, are proposed to the health and sports community in order to aid with resistance training prescription. Appropriate resistance training prescription is effective for developing fitness, health and for enhancing general quality of life. Resistance exercise intensity is commonly prescribed as a percent of the one repetition maximum. 1RM, dynamic muscular strength, one repetition maximum or one execution maximum, is operationally defined as the heaviest load that can be moved over a specific range of motion, one time and with correct performance. The safety of the 1RM assessment has been questioned as such an enormous effort may lead to muscular injury. Prediction equations could help to tackle the problem of predicting the 1RM from submaximal loads, in order to avoid or at least, reduce the associated risks. We built different models from data on 30 men who performed up to 5 sets to exhaustion at different percentages of the 1RM in the bench press action, until reaching their actual 1RM. Also, a comparison of different existing prediction equations is carried out. The LR model seems to outperform the ANN and GP models for the 1RM prediction in the range between 1 and 10 repetitions. At 75% of the 1RM some subjects (n = 5) could perform 13 repetitions with proper technique in the bench press action, whilst other subjects (n = 20) performed statistically significant (p < 0:05) more repetitions at 70% than at 75% of their actual 1RM in the bench press action. Rate of perceived exertion (RPE) seems not to be a good predictor for 1RM when all the sets are performed until exhaustion, as no significant differences (p < 0:05) were found in the RPE at 75%, 80% and 90% of the 1RM. Also, years of experience and weekly hours of strength training are better correlated to 1RM (p < 0:05) than body weight. O'Connor et al. 1RM prediction equation seems to arise from the data gathered and seems to be the most accurate 1RM prediction equation from those proposed in literature and used in this study. Epley's 1RM prediction equation is reproduced by means of data simulation from 1RM literature equations. Finally, future lines of research are proposed related to the problem of the 1RM prediction by means of genetic algorithms, neural networks and clustering techniques. RESUMEN En los últimos años ha habido un creciente interés en el tratamiento y análisis de datos con el propósito de descubrir relaciones, patrones y conocimiento oculto en los mismos. Las técnicas de data mining (también llamadas de \Descubrimiento de conocimiento en bases de datos\) se han aplicado consistentemente a lo gran de un gran espectro de áreas como el marketing, inversiones, detección de fraude, producción industrial, telecomunicaciones y salud. En este estudio, técnicas bien conocidas de data mining como las redes neuronales artificiales (ANN), programación genética (GP), regresión lineal con selección hacia adelante (LR) y la técnica de clustering k-means, se proponen a la comunidad del deporte y la salud con el objetivo de ayudar con la prescripción del entrenamiento de fuerza. Una apropiada prescripción de entrenamiento de fuerza es efectiva no solo para mejorar el estado de forma general, sino para mejorar la salud e incrementar la calidad de vida. La intensidad en un ejercicio de fuerza se prescribe generalmente como un porcentaje de la repetición máxima. 1RM, fuerza muscular dinámica, una repetición máxima o una ejecución máxima, se define operacionalmente como la carga máxima que puede ser movida en un rango de movimiento específico, una vez y con una técnica correcta. La seguridad de las pruebas de 1RM ha sido cuestionada debido a que el gran esfuerzo requerido para llevarlas a cabo puede derivar en serias lesiones musculares. Las ecuaciones predictivas pueden ayudar a atajar el problema de la predicción de la 1RM con cargas sub-máximas y son empleadas con el propósito de eliminar o al menos, reducir los riesgos asociados. En este estudio, se construyeron distintos modelos a partir de los datos recogidos de 30 hombres que realizaron hasta 5 series al fallo en el ejercicio press de banca a distintos porcentajes de la 1RM, hasta llegar a su 1RM real. También se muestra una comparación de algunas de las distintas ecuaciones de predicción propuestas con anterioridad. El modelo LR parece superar a los modelos ANN y GP para la predicción de la 1RM entre 1 y 10 repeticiones. Al 75% de la 1RM algunos sujetos (n = 5) pudieron realizar 13 repeticiones con una técnica apropiada en el ejercicio press de banca, mientras que otros (n = 20) realizaron significativamente (p < 0:05) más repeticiones al 70% que al 75% de su 1RM en el press de banca. El ínndice de esfuerzo percibido (RPE) parece no ser un buen predictor del 1RM cuando todas las series se realizan al fallo, puesto que no existen diferencias signifiativas (p < 0:05) en el RPE al 75%, 80% y el 90% de la 1RM. Además, los años de experiencia y las horas semanales dedicadas al entrenamiento de fuerza están más correlacionadas con la 1RM (p < 0:05) que el peso corporal. La ecuación de O'Connor et al. parece surgir de los datos recogidos y parece ser la ecuación de predicción de 1RM más precisa de aquellas propuestas en la literatura y empleadas en este estudio. La ecuación de predicción de la 1RM de Epley es reproducida mediante simulación de datos a partir de algunas ecuaciones de predicción de la 1RM propuestas con anterioridad. Finalmente, se proponen futuras líneas de investigación relacionadas con el problema de la predicción de la 1RM mediante algoritmos genéticos, redes neuronales y técnicas de clustering.

The muscle strength and bone density relationship in young women: dependence on exercise status

Aim. Numerous studies report an association between muscle strength and bone mineral density (BMD) in young and older women. However, the participants are generally non-athletes, thus it is unclear if the relationship varies by exercise status. Therefore, the purpose was to examine the relationships between BMD and muscle strength in young women with markedly different exercise levels. Methods. Experimental design: cross-sectional. Setting: a University research laboratory. Participants: 18 collegiate gymnasts and 22 age- and weight-matched recreationally active control women. Measures: lumbar spine, femoral neck, arm, leg and whole body BMD (g/cm(2)) were assessed by dual X-ray absorptiometry. In addition, lumbar spine and femoral neck bone mineral apparent density (BMAD, g/cm(3)) was calculated. Handgrip strength and knee extensor and flexor torque (60degrees/s) were determined by dynamometry, and bench press and leg press strength (1-RM) using isotonic equipment. Results. BMD at all sites and bench press, leg press and knee flexor strength were greater in gymnasts than controls (p

Variable changes in body composition, strength and lower-body power during an international rugby sevens season

Exercise intervention in pediatric patients with solid tumors: The PAPEC trial

The randomized controlled trial ‘Physical Activity in Pediatric Cancer’ (PAPEC) determined the effects of an in-hospital exercise intervention combining aerobic and muscle strength training on pediatric cancer patients with solid tumors undergoing neoadjuvant chemotherapy. Methods. Participants were allocated to an exercise (n=24, 17 boys; mean±SEM age 10±1y) or control group (n=25, 18 boys; 11±1y). Training included three sessions/week for 19±2 weeks. Participants were assessed at treatment initiation, termination, and two months after end-treatment. The primary endpoint was muscle strength (as assessed by upper and lower-body five-repetition-maximum (5RM) tests). Secondary endpoints included cardiorespiratory fitness, functional capacity during daily life activities, physical activity, body mass and body mass index, and quality of life. Results. Most sessions were performed in the hospital’s gymnasium. Adherence to the program averaged 68±4% and no major adverse events or health issues were noted. A significant interaction (group*time) effect was found for all 5RM tests. Performance significantly increased after training (leg press: 40% (95% CI=15–41 kg); bench press: 24% (95% CI=6–14 kg); lateral row 25% (95%CI=6–15 kg)), whereas an opposite trend was found in controls. Two-month post values tended to be higher than baseline for leg (P=0.017) and bench press (P=0.014). In contrast, no significant interaction effect was found for any of the secondary endpoints. Conclusion. An in-hospital exercise program for pediatric cancer patients with solid tumors undergoing neoadjuvant treatment increases muscle strength despite the aggressiveness of such therapy. Key words: Cancer, exercise, muscle strength, fitness, quality of life.

Bridge-street banditti, versus the press : report of the trial of Mary-Anne Carlile, for publishing A New-year's address to the reformers of Great Britain written by Richard Carlile; at the instance of the Constitutional Association, before Mr. Justice Best, and a special jury at the Court of King's Bench, Guildhall, London, July 24, 1821. With the nobel and effectual speech of Mr. Cooper, in defence, at large.

In: The Trials with the defences at large of Mrs. Jane Carlile. London : R. Carlile, 1825.

Contemporary American biography : biographical sketches of representative men of the day : representatives of modern thought and progress, of the pulpit, the press, the bench and bar, of legislation, invention and the great industrial interests of the country /

Mode of access: Internet.

Report of the trial of Mrs. Susannah Wright : for publishing, in his shop, the writings and correspondences of R. Carlile, before Chief Justice Abbott, and a special jury, in the Court of King's Bench, Guildhall, London, on Monday, July 8, 1822. Indictment at the instance of the Society for the Suppression of Vice.

In: The trials with the defences at large of Mrs. Jane Carlile. London : R. Carlile, 1825.

Tales of the Delaware bench and bar /

Includes index.

Book Review: Larissa Behrendt, Chris Cuneen and Terri Libesman, Indigenous Legal Relations in Australia (Oxford University Press, Melbourne 2009) 376pp

Indigenous Legal Relations in Australia is a welcome and refreshing addition to the current literature on Indigenous legal issues. Written by a team of highly qualified Indigenous and non-Indigenous academics who share a long term commitment to Indigenous legal and social justice issues, this book provides a clearly written and accessible introductory text for tertiary students and general readers alike who are seeking to gain a deeper understanding of the relationship between Indigenous Australians and the Anglo-Australian legal system.

Astrophysics on the lab bench

In this article some basic laboratory bench experiments are described that are useful for teaching high school students some of the basic principles of stellar astrophysics. For example, in one experiment, students slam a plastic water-filled bottle down onto a bench, ejecting water towards the ceiling illustrating the physics associated with a type II supernova explosion. In another experiment, students roll marbles up and down a double ramp in an attempt to get a marble to enter a tube half way up the slope, which illustrates quantum tunnelling in stellar cores. The experiments are reasonably low cost to either purchase or manufacture.