PMID- 3630727
OWN - NLM
STAT- MEDLINE
DCOM- 19870929
LR  - 20131121
IS  - 0001-6772 (Print)
IS  - 0001-6772 (Linking)
VI  - 130
IP  - 3
DP  - 1987 Jul
TI  - Mean power frequency and integrated electromyogram of repeated isokinetic plantar 
      flexions.
PG  - 501-6
AB  - Peak torque (PT), contraction work (CW), mean power (CP), and time for 
      contraction (t) were recorded for each of 200 full range-of-motion repetitive 
      isokinetic (maximum effort) plantar flexions at the preset angular velocity 60 
      degrees s-1 (degrees X s-1). The subjects were 12 healthy males (42-46 years). 
      Simultaneous recordings of electromyographic activity of the three parts of the 
      triceps surae muscle were made. The electromyograms were truly integrated and the 
      mean power frequency was also calculated for each of the contractions. The 
      mechanical variables decreased steeply during approximately the first 70 
      contractions (the fatigue phase) followed by a steady-state level (the endurance 
      level) with no further significant decrease. The fatigue phase was composed of 
      two parts. The first was characterized by decreases in CW, MPF and in the ratio 
      CW/iEMG, while iEMG and iEMG/t were unaltered. During the second part decreases 
      in iEMG and iEMG/t occurred while MPF and CW/iEMG had stabilized. During the 
      endurance level all the variables were stable but lowered when compared with the 
      initial contractions of the fatigue phase. The results indicated that the 
      mechanical fatigue went through two parts before the steady-state level was 
      established.
FAU - Gerdle, B
AU  - Gerdle B
FAU - Hedberg, R
AU  - Hedberg R
FAU - Jonsson, B
AU  - Jonsson B
FAU - Fugl-Meyer, A R
AU  - Fugl-Meyer AR
LA  - eng
PT  - Journal Article
PL  - England
TA  - Acta Physiol Scand
JT  - Acta physiologica Scandinavica
JID - 0370362
SB  - IM
MH  - Adult
MH  - Biomechanical Phenomena
MH  - Electromyography
MH  - Foot/*physiology
MH  - Humans
MH  - Leg/physiology
MH  - Male
MH  - *Muscle Contraction
MH  - Muscles/*physiology
MH  - Physical Endurance
EDAT- 1987/07/01 00:00
MHDA- 1987/07/01 00:01
CRDT- 1987/07/01 00:00
PHST- 1987/07/01 00:00 [pubmed]
PHST- 1987/07/01 00:01 [medline]
PHST- 1987/07/01 00:00 [entrez]
AID - 10.1111/j.1748-1716.1987.tb08168.x [doi]
PST - ppublish
SO  - Acta Physiol Scand. 1987 Jul;130(3):501-6. doi: 
      10.1111/j.1748-1716.1987.tb08168.x.