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ABSTRACT Introduction: Accelerometry is a very accurate method for determining energy expenditure (EE) in endurance training. However, further studies are needed to prove its accuracy in resistance training. Objective: To compare the EE obtained by accelerometry and indirect calorimetry in three different circuit resistance training circuits. Methods: Six overweight volunteers performed three sets in three resistance training circuits: machine circuit (MC), free-weight circuit (FWC) and resistance + aerobic circuit (RAC). EE was measured by indirect calorimetry using an Oxycon Mobile® and by the accelerometers SenseWear® Armband Pro2 and ActiTrainer®. Results: ActiTrainer® and SenseWear® underestimated EE in all circuits when compared to indirect calorimetry (p<0.05). The difference was greater in the FWC: 44.4% METs and 81.4% Kcal for ActiTrainer® and 32.3% METs and 24.9% Kcal for SenseWear® compared to indirect calorimetry. Conclusion: Both ActiTrainer® and SenseWear® underestimated EE when compared to indirect calorimetry in three different resistance training circuits. Level of evidence II; Diagnostic studies - Investigating a diagnostic test.
RESUMO Introdução: A acelerometria é um método muito preciso para determinar o gasto energético (GE) no treinamento de resistência. No entanto, são necessários mais estudos para provar sua precisão no treinamento de força. Objetivos: Comparar o GE obtido por acelerometria e calorimetria indireta em três diferentes circuitos de treinamento de força. Métodos: Seis voluntários com sobrepeso executaram três voltas em três circuitos de treinamento de força: circuito com máquinas (CM), circuito com pesos livres (CPL) e circuito de força + aeróbico (CFA). O GE foi medido por calorimetria indireta através do Oxycon Mobile® e pelos acelerômetros ActiTrainer® e SenseWear® Armband Pro2. Resultados: O ActiTrainer® e o SenseWear® subestimaram o GE em todos os circuitos em comparação com a calorimetria indireta (p < 0,05). A diferença foi maior no CPL: 44,4% de MET e 81,4% Kcal para ActiTrainer® e 32,3% de MET e 24,9% Kcal para SenseWear® comparados com calorimetria indireta. Conclusão: Ambos os acelerômetros, ActiTrainer® e SenseWear®, subestimaram o GE quando comparados com a calorimetria indireta em três circuitos diferentes de treinamento de força. Nível de evidência II; Estudos diagnósticos -Investigação de um exame para diagnóstico.
RESUMEN Introducción: La acelerometría es un método muy preciso para determinar el gasto de energía (GE) en el entrenamiento de resistencia. Sin embargo, son necesarios más estudios para probar su precisión en el entrenamiento de fuerza. Objetivos: Comparar el GE obtenido por acelerometría y calorimetría indirecta en tres diferentes circuitos de entrenamiento de fuerza. Métodos: Seis voluntarios con sobrepeso ejecutaron tres vueltas en tres circuitos de entrenamiento de fuerza: circuito con máquinas (CM), circuito con pesos libres (CPL) y circuito de fuerza + aeróbico (CFA). El GE fue medido por calorimetría indirecta a través de Oxycon® Mobile y por los acelerómetros ActiTrainer® y SenseWear® Armband Pro2. Resultados: ActiTrainer® y SenseWear® subestimaron el GE en todos los circuitos en comparación con la calorimetría indirecta (p<0,05). La diferencia fue mayor en el CPL: 44,4% de MET y 81,4% Kcal para ActiTrainer® y 32,3% de MET y 24,9% Kcal para SenseWear® comparados con calorimetría indirecta. Conclusión: Ambos acelerómetros, ActiTrainer® y SenseWear®, subestimaron el GE cuando comparados con la calorimetría indirecta en tres circuitos diferentes de entrenamiento de fuerza. Nivel de evidencia II; Estudios diagnósticos - Investigación de un examen para diagnóstico.
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INTRODUCTION: Physical activity (PA) is essential to healthy mental and physical development in early life. However, the prevalence of physical inactivity, which is considered a key modifiable driver of childhood obesity, has reached alarming levels among European youth. There is a need to update the data for Spain, in order to establish if current measures are effective or new approaches are needed. METHODS AND ANALYSIS: We present the protocol for Physical Activity, Sedentarism, lifestyles and Obesity in Spanish youth (PASOS). This observational, nationally representative, multicentre study aims to determine the PA levels, sedentary behaviours and prevalence of physical inactivity (defined as <60 min of moderate to vigorous PA per day) in a representative sample of Spanish children and adolescents. The PASOS study has recruited a representative random sample of children and adolescents aged 8-16 years from 242 educational centres in the 17 'autonomous regions' into which Spain is divided. The aim is to include a total of 4508 youth participants and their families. Weight, height and waist circumference will be measured by standardised procedures. Adherence to the Mediterranean diet, quality of life, sleep duration, PA and sedentary behaviour are being measured by validated questionnaires. PA is measured by the Physical Activity Unit 7-item Screener. A representative subsample (10% of participants) was randomly selected to wear accelerometers for 9 days to obtain objective data on PA. Parents are asked about their educational level, time spent doing PA, diet quality, self-perceived stress, smoking habit, weight, height, their child's birth weight and if the child was breast fed. ETHICS AND DISSEMINATION: The study was approved by the Ethics Committee of the Fundació Sant Joan de Déu, Barcelona, Spain. Main findings of the study will be disseminated to the scientific community and to general public by media conferences, social media and a website. TRIAL REGISTRATION NUMBER: ISRCTN34251612.