PMID- 11754187
OWN - NLM
STAT- MEDLINE
DCOM- 20020129
LR  - 20220317
IS  - 0148-639X (Print)
IS  - 0148-639X (Linking)
VI  - 25
IP  - 1
DP  - 2002 Jan
TI  - Effect of age on muscle functions investigated with surface electromyography.
PG  - 65-76
AB  - The purpose of this study was to investigate changes in the surface 
      electromyographic (EMG) signal as a means of defining age-related central and 
      peripheral mechanisms affecting muscle fatigue. Spectral and temporal variables 
      of the surface EMG signal were studied during voluntary isometric contractions of 
      the dominant biceps brachii muscle in a group of 8 healthy elderly men (age range 
      67-86 years) and a group of 10 healthy young men (age range 23-34 years). The 
      maximal torque developed and the rate of decrease (slope) of spectral variables 
      and conduction velocity (CV) were statistically higher in the young subjects than 
      in the elderly subjects. Motor unit (MU) CV distribution was also estimated from 
      the surface EMG signal and no statistical difference was observed in its variance 
      between the two groups. These results confirm previous findings from the tibialis 
      anterior muscle. Thus, changes in fiber type distribution and decrease in MU 
      firing rate with aging may be factors determining the decrease in maximal 
      voluntary contraction torque and in myoelectric manifestations of muscle fatigue.
CI  - Copyright 2002 John Wiley & Sons, Inc.
FAU - Merletti, Roberto
AU  - Merletti R
AD  - Laboratorio di Ingegneria del Sistema Neuromuscolare, Dipartimento di 
      Elettronica, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, 
      Italy. merletti@polito.it
FAU - Farina, Dario
AU  - Farina D
FAU - Gazzoni, Marco
AU  - Gazzoni M
FAU - Schieroni, Maria Pia
AU  - Schieroni MP
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Muscle Nerve
JT  - Muscle & nerve
JID - 7803146
SB  - IM
MH  - Action Potentials/physiology
MH  - Adult
MH  - Aged
MH  - Aged, 80 and over
MH  - Aging/*physiology
MH  - Arm
MH  - Electromyography
MH  - Humans
MH  - Isometric Contraction
MH  - Male
MH  - Muscle Fatigue/physiology
MH  - Muscle, Skeletal/*physiology
MH  - Neural Conduction
MH  - Time Factors
MH  - Torque
EDAT- 2001/12/26 10:00
MHDA- 2002/01/30 10:01
CRDT- 2001/12/26 10:00
PHST- 2001/12/26 10:00 [pubmed]
PHST- 2002/01/30 10:01 [medline]
PHST- 2001/12/26 10:00 [entrez]
AID - 10.1002/mus.10014 [pii]
AID - 10.1002/mus.10014 [doi]
PST - ppublish
SO  - Muscle Nerve. 2002 Jan;25(1):65-76. doi: 10.1002/mus.10014.