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3 Acta Neurobiologiae Experimentalis

3 1993

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Hindlimb muscle activity during unrestrained walking in cats with lesions of the lateral funiculi

100%

Zmyslowski W. , Gorska T. , Majczynski H. , Bem T.

Acta Neurobiologiae Experimentalis

1993

tom 53

nr 1

143-153

In freely moving intact cats and cats with bilateral lesions of the lateral funicull the foot contact signals and the activity of selected muscles operating at the ankle and knee joints were analysed during walking at moderate speed (0.4-1.0 m/s). No essential changes in the activity of the muscles gastrocnemius lateralis (GL), semitendinosus (ST) and vastus lateralis (VL) were found in operated animals. The tibialis anterior (TA) muscle activity had a shorter duration than the swing phase in operated animals and showed an impaired coactivation with gastrocnemius lateralis (GL) muscle at the end of the swing phase.Pilot experiments indicated that these deficits may be partly compensated for by peroneal nerve electrostimulation. Analysis of regression lines relating the swing duration to the step duration, determined from EMG records, confirmed our previous results, based on foot contact signals (Gorska et al. 1993), showing that in cats with lateral funicular lesions the swing duration varies muchmore with the step duration than in intact animals.

Hindlimb swing, stance and step relationships during unrestrained walking in cats with lateral funicular lesion

100%

Gorska T. , Majczynski H. , Bem T. , Zmyslowski W.

Acta Neurobiologiae Experimentalis

1993

tom 53

nr 1

133-142

In freely moving cats, walking at speeds of 0.4-1.0 m/s, lesions of the lateral funiculi, performed at the low thoracic level, increased the hindlimb step cycle duration and changed the relationships between the stance and swing phase durations and the step cycle duration. The values of the slopes of linear regression lines relating the swing and the step durations were markedly increased, while those for the stance phase were decreased, compared to intact animals. Control dorsal column produced no change in these parameters. The results suggest that pathways in the lateral funiculi play a substantial role in maintaining the proper structure of the step cycle.

Activity of the elbow flexor and extensor muscles during contact placing elicited by tactile stimulation of various aspects of the forelimb in the cat

100%

Czarkowska-Bauch J. , Bem T. , Majczynski H.

Acta Neurobiologiae Experimentalis

1993

tom 53

nr 1

125-131

The activity of the biceps brachiit and lateral head of the triceps brachii were compared during the contact placing reactions elicited by tactile stimuli applied to the lateral, medial or dorsal aspects of the forepaw to verify the hypothesis that common movement strategy was used in all these reactions. Similar latencies and patterns of muscle activation have been found for the medial and dorsal placing while the different timing of the muscle activation was seen in lateral placing reactions. Both muscles often coactiveted during lateral or dorsal and less frequently during medial placing reactions. In dorsal placing the coactivations predominated at the beginning of the reactions while in lateral placing they appeared most frequently in later phases of the reaction. The co-contraction of the elbow flexor and extensor muscles leads to locking of the elbow joint. Thus, the coactivation of these muscles in different phases of the lateral, medial and dorsal placing reactions indicates that various movement strategies have been used as the elbow flexion movement is iniatiated in different phases of these reactions.