Equivalent circuits 18 human 17 Humans 12 adult 9 controlled study 8 female 8 male 8 Article 7 article 7 Equivalence classes 6 major clinical study 6 Efficiency 5 Equivalent circuit model 5 Equivalent viscous damping 5 Timing circuits 5 metabolic equivalent 5 middle aged 5 Battery management systems 4 Charging (batteries) 4 Electric network analysis 4 Equivalence ratios 4 Female 4 Forecasting 4 Noise equivalent power 4 Stiffness 4 ductility 4 human experiment 4 physical activity 4 procedures 4 stiffness 4