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, 2008b , 2008c ). The Cosmed K4b 2 (COSMED, Rome, Italy) is a portable system used to measure the energy cost of free movements that is convenient to use outdoors for measuring gardening tasks and it has the validity and accuracy equal to the Douglas

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, Guangdong, China). Evaluation of the metabolic costs of gardening tasks. To measure the metabolic costs of gardening tasks, in terms of oxygen uptake, energy expenditure, and MET, each child wore a portable telemetric calorimeter (K4b 2 ; Cosmed, Rome, Italy

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) . Additionally, the following fertilizers were used to prepare the nutrient solution: Ca(NO 3 ) 2 (0.87 g/L), KNO 3 (0.30 g/L), K 2 SO 4 (0.18 g/L), MgSO 4+ 7 H 2 O (0.33 g/L), MAP (0.24 g/L), Fe (chelate) (47 mg/L), MnSO 4+ 7 H 2 O (3.8 mg/L), CuSO 4+ 7 H

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(Acuba CS-201 digital hygro-thermometer; Chosun, Guangdong, China). Measurement. Each subject wore a portable telemetric calorimeter (K4b 2 ; Cosmed, Rome, Italy) and respired into the facemask during the gardening tasks and resting periods to measure

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