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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 757 records · Page 42
All sourcesNASA NTRSDOE OSTI
NASA NTRS1970

Muscle training and blood flow

Isotonic training effects on circulation for limb muscular strength characteristics, using peak blood flow and venous compliance measurements

Carlson, L. D.↗
NASA NTRS1973

Functional preservation of vascular smooth muscle tissue

The ionic and cellular feedback relationships operating to effect the vascular decompensatory modifications were examined to reveal procedures for implementing protective measures guarding against vascular collapse when returning from a weightless environment to that of the earth's gravity. The surgical procedures for preparing the rat cremaster, and the fixation methods are described. Abstracts of publications resulting from this research are included.

Alexander, W. C.↗
NASA NTRS1973

Contraction kinetics of ventricular muscle from hibernating and nonhibernating mammals.

Temperature-dependent studies of excitability and tension-production kinetics were made on isolated trabecular strips from hibernating hamsters (HH), nonhibernating hamsters (CH), and from rats (R). The strips were electrically driven and isometric tension along with its first time derivative (dP/dt) were recorded. Excitabilities of both hamster tissues were greater than that of rat tissue from 5 to 38 C with HH greater than CH. Peak tension production followed the order of HH greater than CH greater than R at all temperatures below 24 C. Rat preparations showed an optimum peak tension production at about 31 C while HH and CH showed optima between 17 and 24 C. Times to maximal rates of tension rise showed significant variation. In this respect, the order of sensitivity to decreasing temperature was HH greater than CH greater than R.

South, F. E.↗
NASA NTRS1973

Otolithic influences on extraocular and intraocular muscles

Selective stimulation of utricular gravireceptors leads to gross activation of the bulbar reticular formation where a strong interaction with evoked spino-bulbo-spinal reflex activity occurs. The utricular neurons encountered by microelectrodes in the lateral vestibular nuclei show four types of elicited activity; two of these display an increased firing rate, and two exhibit pronounced inhibitory effects. Application of a stimulus of long duration and constant intensity to the utricle has shown that rapid adaptation of the peripheral receptors is a prominent feature. The effects of selective utricular stimulation upon eye movements, as recorded by the corneoretinal potential method, have been studied in experiments on cats and monkeys and it can be firmly stated that prolonged stimulation of the utricle can evoke strong primary nystagmus, followed by a secondary nystagmus at the cessation of stimulation. The action of utricular stimulation on ocular reflexes has been examined further, with particular attention to evoked pupillary reactions in both cats and monkeys: constriction during the fast phase of the brisk conjugate eye movement, and dilatation during the flow phase.

Gernandt, B. E.↗