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Biomedical subjects

A Lubin

Publications and source records attributed to A Lubin.

At least 37 records · Page 2Linked to original sources
PubMed1975

Stabilization of alpha frequency by sinusoidally modulated light.

Two experiments demonstrate that a spontaneous electroencephalographic (EEG) rhythm, alpha, can be frequency-stabilized by sinusoidally modulated light (SML) but not by photic flash stimulation. It is suggested that this frequency stabilizing effect is not due to superimposition of an evoked response on the background EEG. Instead, SML might phase-lock the scalp-recorded alpha rhythm by influencing subcortical alpha generators within narrow limits set by the inherent resonant EEG frequency.

Adolescent↗
PubMed1975

Dynamics of nap sleep during a 40 hour period.

Following 1 baseline night, the sleep of 8 adult males in equally space 1 h naps during a 40 h period was examined. Ten additional subjects were sleep-deprived for 40 h with 1 h periods of exercise given in place of naps. One recovery night followed the 40 h period for both groups. Total sleep time and the amount of stage REM during the naps were negatively related to the circadian-temperature cycle. Stage REM frequently appeared within 10 min of stage 1 onset and the normal sequence of stages REM and 4 were altered, demonstrating that the organization of sleep within a nap is quite different from that in monophasic nocturnal sleep. Auto-correlation and cross-correlation analyses showed that the relation of sleep stages from hour to hour in normal continuous baseline sleep was altered in nap-to-nap comparison. The timing of REM onset may be controlled by a sleep-dependent ultradian clock; the clock may stop upon awakening and resume at the next sleep onset. Naps had recuperative value in terms of maintaining the normal amounts of sleep stages on the recovery night; recovery sleep for the exercise group showed typical sleep-loss effects.

Adult↗
PubMed1975

Nocturnal increase of plasma testosterone in men: relation to gonadotropins and prolactin.

The nocturnal increase of plasma testosterone (T) in adult men has been well established. Luteinizing hormone (LH) does not show a similar increase throughout the night, whereas prolactin (PRL) does, suggesting the possibility of other hormone influence on T secretion. To investigate this possibility, 8 young adult men were studied for 4 consecutive nights in the sleep laboratory (2 nights adaptation, 2 nights blood sampling), by blood samples taken every 30 min during the 8-h sleep period, for measurement of LH, follicle stimulating hormone (FSH), PRL, and T. LH and FSH were secreted episodically, with little or no change in baseline levels during the night. PRL and T also were secreted episodically, but their baseline levels increased as the night progressed. Both LH and PRL had maximum within-subject correlations (averages equal +0.35 and +0.48 respectively) with T when they led T by 60 min. Within-subject correlations done on first differences (to remove the effect of slow trends) were near zero. LH and PRL had larger correlations with T than did FSH, for both calculations. These data suggest that both LH and PRL levels precede T levels by about 60 min. PRL thus may participate in the regulation of nocturnal T secretion in adult men.

Adult↗