PMID- 4013791
OWN - NLM
STAT- MEDLINE
DCOM- 19850731
LR  - 20131121
IS  - 0001-6772 (Print)
IS  - 0001-6772 (Linking)
VI  - 124
IP  - 2
DP  - 1985 Jun
TI  - Mechanical output and iEMG of isokinetic plantar flexion in 40-64-year-old 
      subjects.
PG  - 201-11
AB  - Peak torque (PT), contractional work (CW) and mean power of isokinetic plantar 
      flexions were measured in unselected, clinically healthy subjects, randomly 
      chosen from the official census lists of Umea, in three age groups: 40-44, 50-54 
      and 60-64 years. Simultaneous recordings of integrated electromyograms (iEMG) 
      were obtained by surface electrodes from all three heads of the m. triceps surae. 
      PT and CW decreased exponentially with increasing velocity of angular motion and 
      at 60 degrees X s-1 (r2 = 0.79 and 0.63, respectively) were adequately determined 
      by crural circumference, age and sex. The muscular output declined with 
      increasing age. Both output and iEMG showed an approximate 3:2 male:female ratio. 
      Therefore, the ratio CW/iEMG was age, but not sex-dependent at any given velocity 
      of angular motion. Independently of this age, the iEMGs were inversely 
      proportional to velocity of angular motion, while iEMG/manoeuvre time was 
      constant indicating that torque/velocity and work/velocity exponential 
      relationships are mainly determined by muscular properties. Based on the 
      literature it is suggested that the dependence of the measured parameters on age 
      and sex is determined by muscular properties, rather than by the central nervous 
      system. Moreover, the CW/iEMG ratio appears to provide a comprehensive picture of 
      excitation and mechanical output of the muscle group studied and may therefore be 
      a useful measure.
FAU - Gerdle, B
AU  - Gerdle B
FAU - Fugl-Meyer, A R
AU  - Fugl-Meyer AR
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - England
TA  - Acta Physiol Scand
JT  - Acta physiologica Scandinavica
JID - 0370362
SB  - IM
MH  - Adult
MH  - Age Factors
MH  - Biomechanical Phenomena
MH  - Body Height
MH  - Body Weight
MH  - Electromyography
MH  - Female
MH  - Humans
MH  - Leisure Activities
MH  - Male
MH  - Middle Aged
MH  - *Muscle Contraction
MH  - Muscles/anatomy & histology
MH  - Physical Exertion
MH  - Sex Factors
OID - NASA: 85247733
EDAT- 1985/06/01 00:00
MHDA- 1985/06/01 00:01
CRDT- 1985/06/01 00:00
PHST- 1985/06/01 00:00 [pubmed]
PHST- 1985/06/01 00:01 [medline]
PHST- 1985/06/01 00:00 [entrez]
AID - 10.1111/j.1748-1716.1985.tb07653.x [doi]
PST - ppublish
SO  - Acta Physiol Scand. 1985 Jun;124(2):201-11. doi: 
      10.1111/j.1748-1716.1985.tb07653.x.