Canadian Society for Exercise Physiology Position Paper: Resistance Training in Children and Adolescents

Many position stands and review papers have refuted the myths associated with resistance training (RT) in children and adolescents. With proper training methods, RT for children and adolescents can be relatively safe and improve overall health. The objective of this position paper and review is to highlight research and provide recommendations in aspects of RT that have not been extensively reported in the pediatric literature. In addition to the well-documented increases in muscular strength and endurance, RT has been used to improve function in pediatric patients with cystic fibrosis, cerebral palsy and burn victims. Increases in children’s muscular strength have been attributed primarily to neurological adaptations due to the disproportionately higher increase in muscle strength than in muscle size. Although most studies using anthropometric measures have not shown significant muscle hypertrophy in children, more sensitive measures such as magnetic resonance imaging and ultrasound have suggested hypertrophy may occur. There is no minimum age for RT for children. However the training and instruction must be appropriate for children and adolescents involving a proper warm-up, cool-down and an appropriate choice of exercises. It is recommended that low-to-moderate intensity resistance should be utilized 2-3 times per week on non-consecutive days, with 1-2 sets initially, progressing to 4 sets of 8-15 repetitions for 8-12 exercises. These exercises can include more advanced movements such as Olympic style lifting, plyometrics and balance training, which can enhance strength, power, co-ordination and balance. However specific guidelines for these more advanced techniques need to be established for youth. In conclusion, a RT program that is within a child’s or adolescent’s capacity, involves gradual progression under qualified instruction and supervision with appropriately sized equipment can involve more advanced or intense RT exercises which can lead to functional (i.e. muscular strength, endurance, power, balance and co-ordination) and health benefits

Effect of betaine supplementation on power performance and fatigue

<p>Abstract</p> <p>Background</p> <p>The purpose of this study was to examine the efficacy of 15 days of betaine supplementation on muscle endurance, power performance and rate of fatigue in active college-aged men.</p> <p>Methods</p> <p>Twenty-four male subjects were randomly assigned to one of two groups. The first group (BET; 20.4 ± 1.3 years; height: 176.8 ± 6.6 cm; body mass: 77.8 ± 13.4 kg) consumed the supplement daily, and the second group (PL; 21.4 ± 4.7 years; height: 181.3 ± 5.9 cm; body mass: 83.3 ± 5.2 kg) consumed a placebo. Subjects were tested prior to the onset of supplementation (T1) and 7 (T2) and 14 days (T3) following supplementation. Each testing period occurred over a 2-day period. During day one of testing subjects performed a vertical jump power (VJP) and a bench press throw (BPT) power test. In addition, subjects were required to perform as many repetitions as possible with 75% of their 1-RM in both the squat and bench press exercises. Both peak and mean power was assessed on each repetition. On day two of testing subjects performed two 30-sec Wingate anaerobic power tests (WAnT), each test separated by a 5-min active rest.</p> <p>Results</p> <p>No differences were seen at T2 or T3 in the repetitions performed to exhaustion or in the number of repetitions performed at 90% of both peak and mean power between the groups in the bench press exercise. The number of repetitions performed in the squat exercise for BET was significantly greater (p < 0.05) than that seen for PL at T2. The number of repetitions performed at 90% or greater of peak power in the squat exercise was significantly greater for BET at both T2 and T3 than PL. No differences in any power assessment (VJP, BPT, WAnT) was seen between the groups</p> <p>Conclusion</p> <p>Two-weeks of betaine supplementation in active, college males appeared to improve muscle endurance of the squat exercise, and increase the quality of repetitions performed.</p

Dynamic Balance In Children: Performance Comparison Between Two Testing Devices

Please view abstract in the attached PDF file

Effects of the Youth Fit For Life Protocol on Physiological Factors, Mood, Self-Appraisal, Voluntary Physical Activity, and Fruit and Vegetable Consumption in Children Enrolled in YMCA After-School Care

Changes associated with the Youth Fit For Life physical activity intervention were assessed with 5- to 12-year-old children in after-school care ( N = 477). Body mass index (BMI), strength, and flexibility significantly improved over 12 weeks. Initial BMI was negatively related to observed changes, r = -.29, p \u3c .001. Significant within-group improvements in tension, vigor, and physical self-concept scores, and levels of voluntary moderate-to-vigorous physical activity/week were also found in the 9- to 12-year-olds (n = 91). Multiple regression analysis indicated that changes in physical self-concept, exercise self-efficacy, and general self scores explained a portion of the variance in changes in voluntary physical activity that approached significance, R2 = .08, F = 2.55, p = .06. Revisions and extensions of the protocol were suggested

Thermogenic effect of meltdown RTD™ energy drink in young healthy women: a double blind, cross-over design study

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A 47-Year Comparison of Lower Body Muscular Power in Spanish Boys: A Short Report

This article belongs to the Special Issue Health Promotion in Children and Adolescents through Sport and Physical Activities—2nd Edition[Abstract] Much of the evidence examining temporal trends in fitness among youth has found a decrease in measures of muscular strength and muscular power over recent decades. The aim of this study was to examine trends in lower body muscular power in Spanish boys over 47 years. In 1969 140 boys (10–11 years; body mass index = 19.24, SD = 2.91 kg/m2) and in 2016, 113 boys (10–11 years; body mass index = 19.20, SD = 3.15 kg/m2) were recruited. Lower body power was assessed using the vertical jump (VJ) and standing long jump (SLJ) tests. Significant differences and a large effect size were shown between groups in the SLJ (p = 0.001; d = 0.94) and the VJ (p = 0.001; d = 0.66). SLJ data in 1969 were higher (1.52 m, SD = 0.19) when compared to the 2016 data (1.34 m, SD = 0.18). The VJ performance of the 1969 sample was also higher (25.95 cm; SD = 6.58) than the 2016 sample (21.56 cm; SD = 4.72). SLJ and VJ performance of the 2016 group decreased 11.8% and 16.9%, respectively. There were no significant differences between groups in body mass index. The results indicate a secular decline in lower body muscular power in 10–11-year-old Spanish boys with no significant changes in body mass index over the 47-year study period

Acute Cardiometabolic Responses to Medicine Ball Interval Training in Children

International Journal of Exercise Science 11(4): 886-899, 2018. Medicine ball interval training (MBIT) has been found to be an effective exercise modality in fitness programs, yet the acute physiological responses to this type of this exercise in youth are unknown. The purpose of this study was to examine the acute cardiometabolic responses to MBIT in children. Fourteen children (mean age 10.1 ± 1.3 yr) were tested for peak oxygen uptake (VO2peak) on a treadmill and subsequently (\u3e 48 hours later) performed a progressive 10 min MBIT protocol of 5 exercises (EX): standing marches (EX1), alternating lunges (EX2), squat swings (EX3), chest passes (EX4) and double arm slams (EX5). A 2.3 kg medicine ball was used for all trials and each exercise was performed twice for 30 sec with a 30 sec rest interval between sets and exercises. Participants exercised while connected to a metabolic system and heart rate (HR) monitor. During the MBIT protocol, mean HR significantly (p\u3c0.05, η2= 0.89) increased from 121.5 ± 12.3 bpm during EX1 to 178.3 ± 9.4 bpm during EX5 and mean VO2 significantly (p\u3c0.05, η2= 0.88) increased from 15.5 ± 2.9 ml ×kg-1×min-1during EX1 to 34.9 ± 5.1 ml ×kg-1×min-1during EX5. Mean HR and VO2values during MBIT ranged from 61.1% to 89.6% of HRpeak and from 28.2% to 63.5% of VO2peak. These descriptive data indicate that MBIT can pose a moderate to vigorous cardiometabolic stimulus in children

Can resistance training prevent and control pediatric dynapenia?

La dinapenia pediátrica es una condición seria que ha visto incrementada su prevalencia entre los niños de hoy en día. Este fenómeno está caracterizado por bajos niveles de fuerza y potencia que no son consecuencia de una enfermedad y que generan limitaciones funcionales en el rendimiento de las habilidades motrices, así como alteraciones cardiometabólicas. Para evitar esta condición e incrementar la salud y el bienestar de los niños y adolescentes es necesario incluir, dentro de la práctica regular de actividad física, un programa de entrenamiento de fuerza. Se ha comprobado que el entrenamiento de fuerza tiene un papel fundamental a la hora de prevenir y controlar la dinapenia pediátrica. No obstante, requiere de una combinación específica entre investigadores, médicos y entrenadores de forma que permita diseñar e implementar de forma segura programas de entrenamiento de fuerza progresivos y adecuados a las necesidades y habilidades de los niños. Esta revisión recoge las principales aportaciones respecto al entrenamiento de fuerza pediátrico y proporciona datos basados en la evidencia para prevenir y controlar la dinapenia pediátrica en los niños. La participación regular en programas de entrenamiento de fuerza contribuirá a prevenir la dinapenia pediátrica en las primeras etapas de la vida. Por tanto, los niños tendrán más posibilidad de ganar confianza y de adquirir las competencias necesarias para aumentar sus posibilidades físicas y de esta forma podrán cumplir en mayor y mejor medida la cantidad de ejercicio diario recomendado. La intervención se hace especialmente necesaria para mejorar los niveles de fuerza y potencia en los niños ya que, de no ser así, se dificultará en gran medida la posibilidad de prevenir una cascada de consecuencias adversas para la salud en etapas posteriores.Pediatric dynapenia is a serious condition with a growing prevalence within youth nowadays. This phenomenon is characterized by low levels of strength and power not provoked by any disease, which produce functional limitations in motor skill performance and consequent cardio-metabolic abnormalities. In order to improve this condition and enhance the health and well-being of children and adolescents, regular participation in physical activities including resistance training is needed. The unique role of resistance training in preventing and managing pediatric dynapenia implies a joint effort from researchers, clinicians and practitioners in order to design, implement and safely progress developmentally appropriate resistance exercise programs consistent with each child’s needs and abilities. This review synthesizes the latest information on youth resistance training and provides evidence-based rationale for preventing and managing pediatric dynapenia in youth. Regular participation in resistance exercise programs in early ages prevent pediatric dynapenia. Consequently, youth will be more likely to gain confidence and competence on their physical abilities and accumulate the recommended amount of daily exercise. Interventions in schools and communities are needed to increase muscular strength and power in youth, with the aim to prevent inevitable cascade of adverse health consequences later in individuals’ life