title: [The sEMG-force relationship during ramp contractions of biceps brachii in non-fatigue exercises].
abstract: OBJECTIVE
  To evaluate the capability of C(N) and determinism% (DET%) together with the linear indices, we detected the surface electromyography (sEMG) signal changes during ramp contractions of biceps brachii.
  
  
  METHODS
  5 seconds sEMG signals of 11 male volunteers were recorded to analyze its changes of the linear indices AEMG, mean power frequency(MPF), MF and the non-linear indices C (N), DET%.
  
  
  RESULTS
  Average electromyography (AEMG) inclined linearly from 112.14 microV to 1277.18 microV while DET% displayed an decrease from 74.95 to 46.7 during the 5 voluntary contractions. The spectrum parameters MPF/MF and C(N) leveled off with the increasing of the force.
  
  
  CONCLUSIONS
  The linear index AEMG inclined linearly while MPF and MF leveled off with the increasing of the force. The non-linear index DET% declined while C(N) leveled off during the 5 seconds ramp contractions.
authors.affiliation: Institute of Psychology, Zhejiang Sci-Tech University, Hangzhou 310018, China. flex1028@zstu.edu.cn
authors.forename: Chao
authors.initials: C
authors.lastname: Song
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Lan-ping
authors.initials: LP
authors.lastname: Lou
mesh_terms: D000293:Adolescent; D000328:Adult; D001132:Arm; D001696:Biomechanical Phenomena; D004576:Electromyography; D006801:Humans; D008297:Male; D009119:Muscle Contraction / Q000502:physiology*; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010807:Physical Endurance; D055815:Young Adult