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| 2. |
- Eiken, Ola, et al.
(författare)
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Pain in the arms induced by markedly increased intravascular pressure decreases after repeated exposures to moderately increased pressures
- 1999
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Ingår i: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology. - 1077-9248. ; 6:1, s. 35-36
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Tidskriftsartikel (refereegranskat)abstract
- It is well documented that exposure to high gravitational (G)-load in the head-to-foot direction may induce arm pain. Such G-induced arm pain is of vascular origin and caused by markedly increased pressure in the arm vessels. It has been hypothesized that the arm pain is due to pressure-induced overdistension of local blood vessels. Indeed, elevation of local intravascular pressure to levels that induce considerable arm pain results in distension of both veins and arteries. There appears to be a paucity of data regarding the effects of repeatedly increasing intravascular pressure in the arms. Accordingly, the purpose of the present study was to investigate the effect of iterative exposures to moderate pressure elevations in the arm vessels (here termed "pressure training") on the pressure distension relationships of the vessels and on pressure-induced arm pain. To experimentally induce increased transmural pressure over the vessel walls of the arms we used a modified version of a method described elsewhere; this method has also proven a useful tool for simulating G-induced arm pain.
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| 5. |
- Golja, Petra, et al.
(författare)
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Core temperature circdian rhythm during 35 days of horizontal bed rest
- 2002
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Ingår i: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology. - 1077-9248. ; 9:1, s. P187-8
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Tidskriftsartikel (refereegranskat)abstract
- The present study evaluated whether the previously reported alterations in core temperature circadian rhythm associated with bed rest might be attributable to increased heat loss from the skin. Infra-red thermograms were obtained at weekly intervals during 5 weeks of bed rest and after 4 weeks of active recovery. Tympanic temperature (Tty) was measured at hourly intervals from 0800 to 2300 hrs on similar occasions during bed rest. There were no significant changes in mean tympanic temperature or amplitude of Tty circadian rhythm during the 5 week bed rest period. Skin temperature decreased progressively during bed rest (P<0.005), with distal regions being the most affected.
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| 6. |
- Kacin, Alan, et al.
(författare)
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Influence of active recovery following prolonged bed rest on static exercise pressor response
- 2002
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Ingår i: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology. - 1077-9248. ; 501, s. 197-198
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Tidskriftsartikel (refereegranskat)abstract
- The present study investigated the effect of active recovery, following 35 days of horizontal bed rest, on the magnitude and time course of the pressor and heart rate responses to sustained 90 minute submaximal isometric contraction of unilateral knee extensor muscles. Ten healthy male subjects were tested immediately post bed rest (Post BR) and again after 4 weeks of active recovery (Recovery). In both trials subjects sustained an absolute force equal to 30% of Post BR maximal voluntary contraction (MVC). Beat-to-beat heart rate (HR) and mean arterial blood pressure (MAP) were monitored continuously during sustained contraction using the volume-clamp technique. Despite a 24% increase in MVC, there were no significant differences in the magnitudes of HR and MAP responses between Post BR and Recovery trials, suggesting a bed rest-induced attenuation of the static exercise pressor response.
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| 7. |
- Mekjavic, Polona Jaki, et al.
(författare)
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Visual function after prolonged bed rest
- 2002
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Ingår i: Journal of gravitational physiology : a journal of the International Society for Gravitational Physiology. - 1077-9248. ; 501, s. 141-142
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Tidskriftsartikel (refereegranskat)abstract
- The present study evaluated the claim of earlier reports, that of bed rest-induced alterations in visual function. Indices of visual function were studied in 10 healthy male subjects, during 35 days of horizontal bed rest. Before and after the 35 day bed rest, both eyes of all subjects were examined for visual acuity, intraocular pressure, contrast sensitivity, stereopsis and visual field. Pre- and post-bed rest values were compared with Student's T-test. There were no significant differences in any of the measured indices of visual function.
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| 8. |
- Pozzo, Marco, et al.
(författare)
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Muscle fiber conduction and fatigue during dynamic actions on a flywheel exercise device
- 2005
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Ingår i: Journal of Gravitational Physiology. - 1077-9248. ; 12:1, s. 113-114
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Tidskriftsartikel (refereegranskat)abstract
- Exposure to microgravity has adverse effects on skeletal muscle size and function. Such effects can be counteracted by training using a Flywheel Exercise Device (FWED). Multichannel EMG signals were detected in nine males from vastus medialis and laterialis muscles during 30 coupled concentric (CON) and eccentric (ECC) actions on the FWED. Muscle fiber conduction velocity (CV) was assessed for each action. CV initial values depended on muscle action type (CON/ECC) and were higher in CON than ECC actions. CV decreased (P<0.05) over time during the task. Its slope was greater for VL than VM but was not different between CON and ECC. It was concluded that direct measure of CV is feasible during dynamic exercise, and that this technique may be used for objective assessment of the effect of resistance training in counteracting microgravity-induced muscle atrophy.
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| 9. |
- Tesch, P.A, et al.
(författare)
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Effects of spaceflight on muscle
- 1998
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Ingår i: Journal of Gravitational Physiology. ; 5:1, s. P19-22
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Tidskriftsartikel (refereegranskat)
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