Simulated effects of microgravity significantly affect rhythmicity and sleep in humans, a new study finds. Such disturbances could negatively affect the physiology and performance of astronauts in space.
Simulated effects of microgravity significantly affect rhythmicity and sleep in humans, a new study from the University of Surrey finds. Such disturbances could negatively affect the physiology and performance of astronauts in space.
"This is the first time that sleep and various biological rhythms have been evaluated from an integrative perspective in a head-down tilt bed rest protocol for this long . We are confident that these findings will serve in designing new protocols aimed at improving sleep and rhythmic robustness in space. In addition, our results can also be applied to other processes such as ageing or the impact of constant posture in our sleep and rhythms.
Researchers observed a decrease in the amplitude of temperature, activity and sleepiness rhythms during bed rest. Sleep duration decreased at the beginning of bed rest, and on average, participants slept less than 6.5 hours during the night throughout the study. Researchers note that partial sleep deprivation of a similar extent has been found to result in changes in immune system function and inflammatory status during both bed rest and spaceflight.
"Biological rhythms are disrupted, and sleep is restricted in space flight and this impacts on physiology and performance. The normal posture cycle is a significant reinforcement signal for biological rhythmicity and its removal in this protocol and absence in space flight likely contributes to reduction in rhythmic amplitudes of many of the variables studied here.
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