Impulse patterns of Ia afferents and Ia-activated DSCT neurons during sinusoidal muscle stretch in cats |
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Authors: | J. Kröller O. -J. Grüsser |
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Affiliation: | (1) Physiologisches Institut der Freien Universität Berlin, Arminallee 22, D-1000 Berlin 33;(2) Neurologische Klinik der Universität, Liebermeisterstrasse 18-20, D-7400 Tübingen, Germany |
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Abstract: | Summary The cat gastrocnemius muscles of one hind leg were stretched sinusoidally with amplitudes between 10 m and 2.5 mm and frequencies between 1 and 30 Hz. The stretch response of deefferented muscle spindle afferents and of Ia-activated cells within Clarke's column were investigated by means of extra-cellular recordings of action potentials. The responses to 20–50 cycles were displayed in impulse patterns (raster diagrams) of the responding action potentials. The impulse patterns of Ia afferents exhibited a high degree of phase-locking (regularity) on the stretch cycle of amplitudes of about 50 m at 3 Hz and all higher amplitudes or frequencies. At comparable stretch parameters the regularity in Ia afferents was 4–6 times larger than in Ia-activated DSCT neurons. The regularity in the DSCT patterns increased with an increase in stretch frequency. The impulse patterns of DSCT cells exhibited a high negative correlation between successive interspike intervals (–0.4 to –0.6) at low stretch frequencies (<3 Hz), which decreased with an increase in stretch frequency. |
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Keywords: | Muscle spindles Ia-activated DSCT cells Sinusoidal muscle stretch Impulse patterns Statistical analysis |
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