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  1. 82 Acta Neurobiologiae Experimentalis

  2. 10 Journal of Physiology and Pharmacology

  3. 2 Studies in Physical Culture and Tourism

  4. 1 Acta Physiologica Polonica

Autorzy help

  1. 95 Celichowski J.

  2. 34 Krutki P.

  3. 20 Drzymala-Celichowska H.

  4. 18 Lochynski D.

  5. 14 Grottel K.

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  1. 4 2019

  2. 7 2017

  3. 1 2016

  4. 6 2015

  5. 12 2013

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1

The influence of pattern of stimuli on changes in tension of unfused tetani of motor units in rat's medial gastrocnemius muscle

100%
Celichowski J.
Acta Neurobiologiae Experimentalis
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1995
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tom 55
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nr 5
2

Variability and plasticity of motor unit contractile properties

100%
Celichowski J.
Acta Neurobiologiae Experimentalis
|
2009
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tom 69
|
nr 3
The motor unit contractile properties respond to changes in activity and in motor innervation of muscles. The contractions of isolated motor units evoked by the electrical stimulation of very thin fi laments of the ventral root were studied in anesthetized animals. Changes in the distribution of the three basic physiological types of motor units (fast fatigable, fast resistant and slow) in the rat medial gastrocnemius muscle and plasticity of their contractile properties as: contraction and relaxation time, force and fatigability were studied in ageing process, as effects of total and partial spinal cord injury, locomotor and vibration training. Moreover, distribution and variability of motor unit properties as well as innervation of skeletal muscles in male and female muscles were investigated. The comparison of motor unit properties in rat and cat muscle revealed considerable differences in twitch time and force parameters, distribution of motor unit types in muscles of the two species whereas the fatigability, ability to potentiate the force, sag and tetanic phenomenon revealed numerous similarities.
3
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Content available

Mechanisms underlying the regulation of motor unit contraction in the skeletal muscle

100%
Celichowski J.
Journal of Physiology and Pharmacology
|
2000
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tom 51
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nr 1
4

Motor units of medial gastrocnemius muscle in the rat during the fatigue test. I. Time course of unfused tetanus

100%
Celichowski J.
Acta Neurobiologiae Experimentalis
|
1992
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tom 52
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nr 1
5

Motor units of medial gastrocnemius muscle in the rat during the fatigue test. II. Changes in the time course of sequential tetani of fatigue test

100%
Celichowski J.
Acta Neurobiologiae Experimentalis
|
1992
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tom 52
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nr 2
6

Tetanic depression: a phenomenon influencing the production of tension in fast-twitch motor units in rat medial gastrocnemius

100%
Celichowski J.
Acta Neurobiologiae Experimentalis
|
2001
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tom 61
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nr 2
7

The influence of endurance training on contractile properties of motor units in the rat medial gastrocnemius muscle

63%
Pogrzebna M., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2005
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tom 65
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nr 3
8

Division of motor units in Medial gastrocnemius muscle of the rat in the light of variability of their principal properties

63%
Grottel K., Celichowski J.
Acta Neurobiologiae Experimentalis
|
1990
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tom 50
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nr 6
9
Content available remote

Changes in contractile properties and action potentials of motor units in the rat medial gastrocnemius muscle during maturation

63%
Dobrzynska Z., Celichowski J.
Journal of Physiology and Pharmacology
|
2016
|
tom 67
|
nr 1
10

Changes in contractile properties and action potentials of motor units in the rat medial gastrocnemius muscle during maturation

63%
Dobrzynska Z., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2013
|
tom 73
|
nr Suppl.1
The development of motor unit (MU) properties after the elimination of polyneuronal innervation of muscle fibers has not been studied so far in contrast to the embryonic and neonatal development which are well known. Three groups of Wistar rats were investigated – 1 month old, 2 months old and the adult – 9 months old (1 m.o., 2 m.o. and 9 m.o. rats, respectively). The basic contractile properties and action potentials of MUs in the medial gastrocnemius muscle were analysed. In 1 mo rats the three main physiological types of MUs were already separated. It was visible that various MU’s contractile properties reached adult values at different stage of development. The twitch time parameters were similar for all studied age groups whereas the force was increasing, especially in the second month of life. The fatigue index for FF MUs as well as the twitch-to tetanus ratio for all three types of MUs in 1 and 2 m.o. rats were higher than for 9 m.o. rats. The amplitude and time parameters of MUAPs, except their latency, were not changing during the studied period of development.
11

Tetanic potentiation in motor units of rat medial gastrocnemius

63%
Piotrkiewicz M., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2007
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tom 67
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nr 1
Tetanic potentiation is a phenomenon, which expresses the ability of a motor unit (MU) to increase its force output in tetanic contractions above that predicted with an assumption of algebraic summation of single twitch responses. To quantify tetanic potentiation, a coefficient TPC (tetanic potentiation coefficient) was defined as a ratio of the areas below tetanic force recording corresponding to the single stimulus contribution and that of the single twitch. Single MUs (27 Slow, 71 Fast, Fatigue Resistant, and 47 Fast, Fatigable) were isolated from the rat medial gastrocnemius muscle (MG) by ventral root splitting. TPC value was rate-dependent, with the maximum TPCmax at a certain optimal rate. The largest values of the TPCmax were obtained in the weakest and most fatigue resistant (S and weak FR) MUs. The different manifestation of staircase effect, post-tetanic and tetanic potentiation in individual MU types indicates that these phenomena may be independent of each other. We suggest that these phenomena as well as the fatigue resistance should be reexamined with protocols adjusted to the MU optimal frequency.
12

Differences between motor unit properties in distal and proximal muscles of rat hind limb

63%
Ciechanowicz I., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2007
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tom 67
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nr 3
13

Conrtactile propertiens and distribution of types of motor units innervated by axons from L.5 ventral roots in the rat medial gastrocnemius

63%
Taborowska M., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2009
|
tom 69
|
nr 3
There is a limited data concerning the rostro-caudal distribution of motoneurons within the motor nucleus. In present experiments single motor units in rat medial gastrocnemius were studied and their contractile properties as well as percentage participation of different types of motor units belonging to subpopulations innervated by axons in L4 and L5 ventral roots were analyzed. Experiments were based on functional isolation and electrical stimulation of as many as possible axons from L4 and L5 ventral roots. 35 motor units innervated by L4 and 90 units innervated by L5 ventral root were studied. We found that the composition of the three physiological types of motor units (fast fatigable, fast resistant and slow) in the two subpopulations of motor units was similar. However, the twitch time parameters (the contraction time and half-relaxation time) were slightly longer in L4 in comparison with L5 subpopulation (the difference was signifi cant for fast resistant units) although the difference has not been refl ected in expected shift of a steep part of force-frequency of stimulation curve towards lower frequencies in L4 subpopulation of motor units. Force parameters were similar for motor units belonging to two subpopulations. The small differences between L4 and L5 subpopulations of motor units can be due to possible differences in a spatial distribution of their muscle fi bres in the semipennate medial gastrocnemius.
14

Variability of contractile properties and action potentials of motor unit in flexor digitorum brevis nad medial gastrocnemiusmuscles in the rat

63%
Ciechanowicz-Kowalczyk I., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2009
|
tom 69
|
nr 3
The differences between motor unit (MU) properties in foot (fl exor digitorum brevis, FDB) and sural (medial gastrocnemius, MG) muscles in anaesthetized Wistar rats were studied. In experiments functional isolation of single MUs was achieved by stimulation of thin fi laments from the L5–L6 and L4–L5 ventral roots for FDB and MG muscles, respectively. The mean muscle mass amounted to 76 mg for FDB and 895 mg for MG. The force and the motor unit action potential (MUAP) properties were analysed. The three types of MUs (FF, FR and S) in the MG muscle were found. Sag phenomenon was visible in all fast units at 40 Hz stimulation. In FDB, the slow MUs were not noted. Sag was visible for only a part of fast MUs at lower frequencies of stimulation. In the MG muscle the fatigue index had bimodal distribution, whereas in FDB the distribution was continuous. The twitch and maximum forces were approximately 8 times lower in FBD then in MG, whereas the contraction time was signifi cantly longer. The force-frequency curves of all motor units in FDB were shifted towards lower frequencies and comparison to the same type of MUs in MG. The MUAP durations for FF and FR MUs were longer whereas the MUAP amplitudes were higher for FF units in MG in relation to FDB. In conclusion, the variability of MU properties in distal and proximal muscle concerns all studied contractile parameters and likely refl ects different motor control strategy.
15

Differences between małe and female motor unit properties of the medial gastocnemius muscle in rat

63%
Drzymala H., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2005
|
tom 65
|
nr 3
16

Changes in motor units properties in a rat model of amyothropic lateral sclerosis (ALS)

63%
Krisciak K., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2009
|
tom 69
|
nr 3
ALS is a fatal neurodegenerative disorder characterized by developing muscle weakness and paralysis which is an effect of selective and progressive death of motoneurons. The experiments were carried out on motor units (MUs) of the medial gastrocnemius muscle in transgenic rats with hSOD1(G93A) mutation. The animals were divided into three groups: 3 months old, 4 months old and approximately 200 days old in nearly terminal state, when nerve stimulation revealed on average 6 MUs in the studied muscle. Because of considerable disturbances in contraction time (CT) and disappearance of sag effect, usually applied for MUs classifi cation as fast and slow, the division of MUs was based on 20 Hz tetanus index. Meanwhile, to distinguish fast fatigable (FF) from the fast resistant (FR) MUs the fatigue index (FatI) was applied. Results showed that MUs proportion changed radically in the course of the disease and in terminal state an increase of S and a decrease of fast MUs was observed. Moreover, CT increased gradually in all MU types. FatI of FF MUs increased but, at the same time, for FR and S gradually decreased. Twitch force as well as tetanus force in terminal group increased especially for FR and S MUs what indicates plastic changes in examined muscle (sprouting of surviving axons and collateral reinnervation), leading also to increased amplitude of MUs action potentials. EMG analysis additionally showed slowing of axonal conduction velocity or/and motor plate transduction.
17

The comparison of motor units contractile properties in medial gastrocnemius muscles of the normal and ADHD rats

63%
Ciechanowicz-Kowalczyk L., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2013
|
tom 73
|
nr Suppl.1
The motor unit (MU) contractile properties in medial gastrocnemius muscle of young Wistar Kyoto rats, the model of attention deficit hyperactivity disorder (ADHD), and normal Wistar rats were studied. Functional isolation of motor units was achieved by electrical stimulation of single axons from ventral roots of L4–L5 spinal nerves. The motor units parameters: the force of twitch and tetanus, the contraction and the half-relaxation times and the properties of action potentials were analyzed for 47 and 60 MUs in ADHD and normal rats, respectively. The three types of MUs (FF, FR and S) in both groups were found. The distribution of FF, FR and S MUs for normal rats was: 26.7, 55.0 and 18.3% whereas the distribution of FF, FR and S MUs for ADHD rats was: 27.6, 44.7 and 27.6%. There were no statistical differences in motor units force and twitch time parameters. However, the twitch-to-tetanus ratio was higher for MUs in ADHD animals. Moreover, differences between shapes of twitch recordings were found and a ratio of the contraction to the half-relaxation times was lower for MUs in ADHD animals. The mean number of turns of MU action potentials was lower in all types of MUs of ADHD rats.
18

Differences in the contractile properties and action potentials of motor units of the medical gastrocnemius muscle in young and adult male rats

63%
Dobrzynska Z., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2011
|
tom 71
|
nr S
The growing up of organism is connected with considerable changes in neuromuscular and other systems. Numerous studies concerning a development of muscles and nerves have been carried out, especially within the embrional and neonatal life period although postnatal development of motor unit properties has not been studied. The aim of the present study was to document changes in contractile properties of skeletal muscles during a life period when embryonic and neonatal isoforms of myosin disappear but muscle mass is dynamically increasing. The two groups of animals, the young Wistar rats - 40 days old and the adult ones - 270 days old were investigated. The basic contractile properties and action potential of motor units (MUs) in the medial gastrocnemius muscle were analyzed. The body weight of young rats was three times lower than of adults (146.9 g vs 461.3 g), but the muscle mass was four times lower (0.313 g vs 1.246 g, respectively). The contraction time and half-relaxation time of fast MUs in 40-day-old rats were slightly longer than in adults. The twitch forces for the three MU types were two to three times lower in young rats, where the tetanus forces for all MU types were three to five times lower for 40-day-old animals. The twitch-to-tetanus ratio for all three types of MUs in young animals was significantly higher than in adult ones (0.43 vs 0.29 for FF, 0.31 vs 0.21 for FR, and 0.15 vs 0.08 for S MUs for young and adult rats, respectively). Moreover, considerable difference in the proportion of MU types was also observed. In adult rats higher participation of fast MUs was observed (33.7% of FF MUs and 55.4% of FR MUs) than in young ones (30.1% of FF and 41.1% of FR MUs) whereas slow MUs constituted 10.8% and 28.8% of studied populations of MUs in adult and young rats respectively. No significant differences in motor unit action potential parameters between young and adult animals were noticed.
19

Tetanic depression of fast motor units during gradually increasing frequency of stimulation

63%
Lochynski D., Celichowski J.
Acta Neurobiologiae Experimentalis
|
2007
|
tom 67
|
nr 3
20
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The rate of changes in tension within fused tetani of single motor units in rat medial gastrocnemius muscle

63%
Celichowski J., Bichler E.
Journal of Physiology and Pharmacology
|
1998
|
tom 49
|
nr 4
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