[EMG characteristics of women in respect with phase of the menstrual cycle, season and type of vegetative regulation].

Here we report on the electromyographic (EMG) characteristics of young females (n = 23, 19.9 +/- 1.4 years) under varied environmental and physical conditions: 4 phases of menstrual cycle phase (early and late follicular, ovulation, and luteal), spring and autumn seasons, and type of the vegetative nervous system (VNS) regulation based on the linear and novel non-linear parameters of interference EMG (iEMG) in m.

[Characteristics of contractile properties of the cat skeletal muscle after sympathetic denervation].

Twitching and tetanus were registered during stimulation in the cat desympathised m. semitendinosus, similar to those occurring in the motor units during thermoregulatory tone. The contractile responses were greater in the early desynpathisation phase.

[Comparative characterization of the thermoregulatory activity of motor units in "spinal" and intact cats].

The functional features of motor units (MU) were studied in spinal (n = 26) and intact (n = 18) cats during thermoregulatory muscle activity (TMA). The spinal cats were demonstrated to retain the ability to generate TMA though MU activity was extremely irregular. Thus, the variability of interspike intervals (ISI) was 100 to 400 msec at firing rates of 1-10 imp per sec).

[The thermoregulatory activity of the skeletal muscle motor units in the cat under conditions of sympathetic denervation].

Thermoregulatory activity of motor units was investigated in the cat mm sartorius and semitendinosus on the 7th and 14th days after lumbar sympathectomy. The EMG pattern did not change after gangliotomy but a statistically significant prolongation of the interspike intervals occurred on the 7th day indicating a growing instability of the motoneuronal pool activity. These changes tended to restore on the 14th day.