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Motor-unit Discharge Rates In Maximal Voluntary Contractions Of Three Human Muscles.

F. Bellemare, J. Woods, R. Johansson, B. Bigland-ritchie
Published 1983 · Psychology, Medicine

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Single motor-unit firing rates have been recorded during maximal voluntary contractions using tungsten microelectrodes. Over 300 units from four subjects were sampled from each of three muscles. These were the biceps brachii, adductor pollicis, and soleus, chosen because of known differences in their fiber-type composition and contractile properties. In all cases the contraction maximality was assured by delivering single supramaximal shocks during the voluntary contractions. All motor units were deemed to have already been fully activated if no additional force resulted. Thus for each muscle, the firing rates elicited by a maximal voluntary effort are sufficient to generate a fully fused tetanus in each motor unit. For the biceps brachii and adductor pollicis muscles, the mean firing rates (+/- SD) were 31.1 +/- 10.1 and 29.9 +/- 8.6 Hz, respectively, while for soleus they were only 10.7 +/- 2.9 HZ. For each muscle the firing rates distribution covered approximately a four-fold range about the mean value. The mean firing rates for each muscle varied roughly in proportion to their respective twitch contraction and half relaxation times. These contractile time measurements for both biceps brachii and adductor pollicis agreed well with the mean values reported for human fast-twitch motor units, while those for soleus fell in the range observed for human slow-twitch units. An argument is presented that suggests that, in response to voluntary effort, the range of discharge rates of each motor-unit pool is limited to those only just sufficient to produce maximum force in each motor unit. This suggestion is based on the relationship between the range of motor-unit firing frequencies observed during maximum voluntary contractions, their range of contraction times, and the stimulation frequencies required for maximum force generation. The implications of this hypothesis for motor control are discussed.
This paper references
Comparison of the recruitment and discharge properties of motor units in human brachial biceps and adductor pollicis during isometric contractions
C. Kukulka (1981)
Sternomastoid muscle function and fatigue in man.
J. Moxham (1980)
Dynamics of energetic processes in human muscle
J. A. FAULKNER (1980)
Detection of diaphragmatic fatigue in man by phrenic stimulation.
M. Aubier (1981)
Frequency stabilization in the motor centers of spinal cord and caudal brain stem.
F. Bracchi (1966)
On Inhibition as a Reflex Accompaniment of the Tendon Jerk and of other Forms of Active Muscular Response
D. Dennybrown (1928)
Motor unit organization of human medial gastrocnemius.
R. A. Garnett (1979)
The absence of neuromuscular transmission failure in sustained maximal voluntary contractions.
B. Bigland-ritchie (1982)
Changes in motoneurone firing rates during sustained maximal voluntary contractions.
B. Bigland-ritchie (1983)
Motor unit of mammalian muscle.
F. Buchthal (1980)
Changes in firing rate of human motor units during linearly changing voluntary contractions
H. Milner-Brown (1973)
Motor Units: Anatomy, Physiology, and Functional Organization
R. E. Burke (1981)
Isometric contraction of the abductor digiti minimi muscle in man
D. Burke (1974)
Single unit recordings from muscle nerves in human subjects.
K. Hagbarth (1969)
Ballistic contractions in fast or slow human muscles; discharge patterns of single motor units
J. Desmedt (1978)
Isometric force production by motor units of extensor digitorum communis muscle in man.
A. Monster (1977)
The fatigue and voluntary discharge properties of single motor units in man
L. Grimby (1981)
Physiological analysis of muscle weakness and fatigue
R.H.T. EDWARDS (1978)
Influence of joint position on ankle dorsiflexion in humans.
E. Marsh (1981)
Data on the distribution of fibre types in thirty-six human muscles. An autopsy study.
M. Johnson (1973)
Isolated single motor units in human muscle and their rate of discharge during maximal voluntary effort.
C. Marsden (1971)
The fatigability of human motor units.
Stephens Ja (1975)
Voluntary strength and fatigue
P. Merton (1954)
Linear and non-linear surface EMG/force relationships in human muscles. An anatomical/functional argument for the existence of both.
J. Woods (1983)
Discharge patterns of soleus motor units with associated changes in force exerted by foot during quiet stance in man.
S. Mori (1973)
Extent of motor unit activation during effort.
A. Y. Bélanger (1981)
Motor unit activity in the voluntary contraction of human muscle
B. Bigland (1954)
Contrac - tion time and fiber types in intact human muscles
F. BUCHTHAL (1970)
Contractile speed and EMG changes during fatigue of sustained maximal voluntary contractions.
B. Bigland-ritchie (1983)

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The effect of heating and cooling on time course of voluntary and electrically induced muscle force variation.
M. Brazaitis (2011)
Residual force depression following muscle shortening is exaggerated by prior eccentric drop jump exercise.
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S. Binder-Macleod ()
Reduced motor unit discharge rates of maximal velocity dynamic contractions in response to a submaximal dynamic fatigue protocol.
B. Harwood (2012)
Twitch interpolation in human muscles: mechanisms and implications for measurement of voluntary activation.
R. Herbert (1999)
Excitability properties of median and peroneal motor axons
S. Kuwabara (2000)
Dynamics and consequences of potassium shifts in skeletal muscle and heart during exercise.
O. Sejersted (2000)
Triphasic behavioral response of motor units to submaximal fatiguing exercise
L. Dorfman (1990)
Matching initial torque with different stimulation parameters influences skeletal muscle fatigue.
C. Bickel (2012)
Muscle fatigue: clinical implications for fatigue assessment and neuromuscular electrical stimulation.
S. Binder-Macleod (1993)
Human motoneurone excitability is depressed by activation of serotonin 1A receptors with buspirone
Jessica D'Amico (2017)
Moderately elevated extracellular [K+] potentiates submaximal force and power in skeletal muscle via increased [Ca2+]i during contractions.
K. K. Pedersen (2019)
Impaired calcium release during fatigue.
D. Allen (2008)
Motor Unit Firing Behaviour of Soleus Muscle in Isometric and Dynamic Contractions
J. Kallio (2013)
Characteristics of the Motor Units during Sternocleidomastoid Isometric Flexion among Patients with Mechanical Neck Disorder and Asymptomatic Individuals
Chia-Chi Yang (2016)
Motor Unit Interpulse Intervals During High Force Contractions.
M. Stock (2016)
Neural control in human muscle fatigue : changes in muscle afferents , moto neurones and moto cortical drive
S C G A N D E V I A (1998)
Brandon C Gruver (2018)
Noninvasive observation of skeletal muscle contraction using near-infrared time-resolved reflectance and diffusing-wave spectroscopy.
Markus Belau (2010)
The Effects of Strength Training and Disuse on the Mechanisms of Fatigue
David G. Behm (1998)
Reducing muscle fatigue during transcutaneous neuromuscular electrical stimulation by spatially and sequentially distributing electrical stimulation sources
D. Sayenko (2013)
The effect of maximal isometric training on doublet-induced force enhancement and its relationship with changes in voluntary rate of force development
David Murray (2018)
The Computer-Vibromyography as a Biometric Progress in Studying Muscle Function - Die Computer-Vibromyographie - Ein biometrischer Ansatz zur Messung mechanischer Muskelaktivität
M. Keidel (1989)
Evidence of inability to fully activate human limb muscle
G. Yue (2000)
An Energetic Model of Low Frequency Isometric Neuromuscular Electrical Stimulation
C. Minogue (2014)
Modulation of Proportional and Derivative (Pd) Control Command Can Match Physiological Ankle Torque Modulation During Quiet Standing
A. Vette (2017)
Contraction level-related modulation of corticomuscular coherence differs between the tibialis anterior and soleus muscles in humans.
Junichi Ushiyama (2012)
Surface EMG spectral analysis as an indicator of fatiguing factors during dynamic sports related movements
A. Murphy (2011)
Characteristics of motor unit discharge in subjects with hemiparesis
J. J. Gemperline (1995)
Discharge properties of motor units of the abductor hallucis muscle during cramp contractions.
M. Minetto (2009)
The acute effects of glycemic control on axonal excitability in human diabetic nerves.
S. Kuwabara (2002)
Motor unit physiology: Some unresolved issues
R. Enoka (2001)
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