title: Prediction equations of energy expenditure in Chinese youth based on step frequency during walking and running.
abstract: OBJECTIVE
  This study set out to examine the relationship between step frequency and velocity to develop a step frequency-based equation to predict Chinese youth's energy expenditure (EE) during walking and running.
  
  
  METHODS
  A total of 173 boys and girls aged 11 to 18 years old participated in this study. The participants walked and ran on a treadmill at speeds of 3 km/hr, 4 km/hr, 5 km/hr, 6 km/hr, 7 km/hr, and 8 km/hr. EE was measured using indirect calorimetry of open circuit spirometry (Cosmed K4b2 metabolic analyzer). Using multiple regression analysis, the relationship between step frequency and velocity was first examined, and the prediction equation of EE based on step frequency, age, and gender was derived.
  
  
  RESULTS
  The hypothesized relationship between step frequency and velocity was confirmed and an accurate (R2 = .78) EE prediction equation was derived: NetEE = - 13.7744 + 1.8004 (step frequency) - 5.5715 (age) - 11.5244 (gender).
  
  
  CONCLUSIONS
  A step frequency-, age-, and gender-based equation was derived to predict the EE of youth during walking and running. The equation can be used to develop a simple device to estimate EE during walking and running in this population.
authors: Key Laboratory of Exercise and Health Sciences, Ministry of Education, Shanghai University of Sport, 650 Qing Yuan Huan Road, Shanghai 200438, China.
authors: Bo
authors: B
authors: Sun
authors: Key Laboratory of Exercise and Health Sciences, Ministry of Education, Shanghai University of Sport, 650 Qing Yuan Huan Road, Shanghai 200438, China.
authors: Yu
authors: Y
authors: Liu
authors: Key Laboratory of Exercise and Health Sciences, Ministry of Education, Shanghai University of Sport, 650 Qing Yuan Huan Road, Shanghai 200438, China.
authors: Jing Xian
authors: JX
authors: Li
authors: Key Laboratory of Exercise and Health Sciences, Ministry of Education, Shanghai University of Sport, 650 Qing Yuan Huan Road, Shanghai 200438, China.
authors: Haipeng
authors: H
authors: Li
authors: Key Laboratory of Exercise and Health Sciences, Ministry of Education, Shanghai University of Sport, 650 Qing Yuan Huan Road, Shanghai 200438, China.
authors: Peijie
authors: P
authors: Chen
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001827:Body Height / Q000502:physiology; D015992:Body Mass Index; D002153:Calorimetry, Indirect; D002648:Child; D002681:China; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D012044:Regression Analysis; D012420:Running / Q000502:physiology*; D012737:Sex Factors; D016138:Walking / Q000502:physiology*