Action potentials and twitch forces of rabbit masseter motor units at optimum jaw angle

Eijden, T.M.G.J. van; Turkawski, S.J.J.

doi:10.1016/s0003-9969(02)00044-4

Cited by 5 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The duration of an MUAP is strongly associated with length and diameter of muscle fibers . Fibers with larger diameters usually have faster conduction velocities, which would imply shorter time parameters of MUAPs in the overloaded, hypertrophied muscle.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Force regulation and electrical properties of motor units in overloaded muscle

et al. 2015

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 99%

“…Major determinants of the MUAP amplitude are size of MU, diameter of muscle fibers, and their density around the recording electrode . However, only in S MUs were changes in contractile forces and effects of hypertrophy reflected in MUAP amplitude.…”

Section: Discussionmentioning

confidence: 99%

Force regulation and electrical properties of motor units in overloaded muscle

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Duration of MUAPs is strongly associated with length and diameter of muscle fibres (Eijden and Turkawski, 2002;Dumitru et al, 1999;Gath and Stalberg, 1975). The results obtained with bipolar recordings from the muscle with the same electrodes in the cat and rat preparations partly reflect the above dependences.…”

Section: Discussionmentioning

confidence: 66%

“…Main factors determining the MUAP's amplitude are motor unit size, diameter, of muscle fibres and their density in the transverse plane around the recording electrode (Eijden and Turkawski, 2002;Grottel and Celichowski, 1988b;Kernell et al, 1983). The highest amplitudes can be recorded from fibres being near the electrode in comparison to those dispersed from a distance.…”

Section: Discussionmentioning

confidence: 99%

“…This method is also useful in clinical studies for recordings of motor unit action potentials (MUAPs) reflecting electrical activity of single motor units, and is especially effective for small muscles of the hand (Bertram et al, 1995). However, due to difficulties in isolation of single MUs and its invasive character, most studies describing the relationship between MUAP and contractile properties of motor units have been performed in animal species, as cat, rabbit or rat (Enoka et al, 1992;Eijden and Turkawski, 2002;Grottel and Celichowski, 1988a).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative analysis of motor unit action potentials of the medial gastrocnemius muscle in cats and rats

Krutki

Ciechanowicz

Celichowski

et al. 2008

Journal of Electromyography and Kinesiology

View full text Add to dashboard Cite

Slow motor units in female rat soleus are slower and weaker than their male counterparts

Drzymała‐Celichowska

Krutki

2015

J Muscle Res Cell Motil

View full text Add to dashboard Cite

The aim of the study was to investigate sex-related differences in contractile properties, parameters of action potentials, and mechanisms of force regulation of motor units in the rat soleus muscle, which is a frequent experimental model in animal research. It was revealed that the mean mass of the muscle in males was bigger than in females, by approximately 80%. However, the relation of the muscle mass to the body mass was not significantly different. These results correspond to approximately twice as much tetanic force per motor unit in male rats, and higher maximal contractile output, reflected by the force-time area per stimulus pulse. On the other hand, no differences were observed with respect to twitch forces of motor units. Thus the twitch-to-tetanus ratio was significantly higher in females. Additionally, the contraction and the half-relaxation times were significantly longer in female motor units, which might be due to differences in muscle architecture. The force-frequency curve in males was shifted rightwards with respect to females, indicating that the same relative level of tetanic force could be achieved at considerably lower stimulation frequency in females. The analysis of motor unit action potentials revealed about four times higher amplitudes in male rats, whereas the time parameters of action potentials were similar. The motor units in male and female rat soleus are considerably different and these observations should be taken in the consideration in various experiments on the muscle.

show abstract

Action potentials and twitch forces of rabbit masseter motor units at optimum jaw angle

Cited by 5 publications

References 21 publications

Force regulation and electrical properties of motor units in overloaded muscle

Force regulation and electrical properties of motor units in overloaded muscle

Comparative analysis of motor unit action potentials of the medial gastrocnemius muscle in cats and rats

Slow motor units in female rat soleus are slower and weaker than their male counterparts

Contact Info

Product

Resources

About