Search results for "Microgravity"

Blood flow in the internal jugular veins during the spaceflight - Is it actually bidirectional?

2020

Recently intriguing results of the research performed on astronauts of the International Space Station have been published. Unexpectedly, in some crew members a stagnant and bidirectional flow in the internal jugular vein was found, and in one of the astronauts this vein seemed to be totally thrombosed. If it actually were the case that in the settings of weightlessness there is a substantial risk of jugular vein thrombosis, any long-term human space missions would be extremely dangerous. Yet, we interpret these findings differently. In our opinion, what has been explained as bidirectional flow, actually represented the flow separation, and what has been described as occluded vein was rathe…

Effects of a 21 days space flight on the mechanical performance and the EMG power spectrum of the leg muscles

2002

Personality, social support and affective states during simulated microgravity in healthy women

2009

This study investigated the time-course of stress and recovery states and their relations to social support and personality traits in healthy women during a long-term head-down tilt bed rest. Personality, social support and affective states were assessed in 16 women exposed to simulated microgravity for a 60-day duration involving three stages: a 20-day baseline control period (BDC), a 60-day head-down tilt bed rest (HDT) and a 20-day post-HDT ambulatory recovery period (R+). Participants were divided into two groups: an exercise (Exe, n = 8) and a control group (Ctl, n = 8). All the participants experienced significantly more stress during the HDT period. But exercise did not improve the i…

Growing and Shaping Metal–Organic Framework Single Crystals at the Millimeter Scale

2020

Controlling and understanding the mechanisms that harness crystallization processes is of utmost importance in contemporary materials science and, in particular, in the realm of reticular solids where it still remains a great challenge. In this work, we show that environments mimicking microgravity conditions can harness the size and shape of functional biogenic crystals such as peptide-based metal–organic frameworks (MOFs). In particular, we demonstrate formation of the largest single crystals with controlled nonequilibrium shapes of peptide-based MOFs reported to date (e.g., those featuring curved crystal habits), as opposed to the typical polyhedral microcrystals obtained under bul…

Analisi delle modificazioni indotte dalla microgravità sulla reazione di orientamento indotta nel ratto da stimoli acustici.

2004

Experiments were performed on male Wistar rat during the 4th ESA Student Parabolioc Flight Campaign. Analysis of head turning movement has been employed to study mechanisms involved in sensorimotor integration. Results showed a significant increase both in latency and duration of the response in microgravity condition. A modified cerebellar elaboration process of peripheral proprioceptive and vestibular signals during microgravity has been hypothesized.

Towards human exploration of space: the THESEUS review series on cardiovascular, respiratory, and renal research priorities

2016

International audience; The THESEUS project (Towards Human Exploration of Space: aEUropean Strategy) was initiated within the seventh FrameworkProgramme by the European Commission. This project aimed toprovide a cross-cutting, life science-based roadmap for Europe’sstrategy towards human exploration of space, especially for deepspace missions and its relevance to applications on Earth. Toaddress these challenges, relevance of space research on thecardiovascular system, the lungs and kidneys, was discussed in anexpert group and its principal conclusions will be presented in thisarticle.

Stress and recovery assessment during simulated microgravity: Effects of exercise during a long-term head down tilt bed rest in women. 37th COSPAR Sc…

2008

Stress and recovery assessment during simulated microgravity: Effects of exercise during a long-term head down tilt bed rest in women.

2009

International audience; The aim of this study was to determine the effects of a 60-day head-down tilt long-term bed rest (HDT) on stress and recovery in sixteen healthy female volunteers. Participants were randomly assigned to either an exercise group (Exe) that followed a training program combining resistive and aerobic exercises, or to a no-exercise control group (Ctl). Psychological states were assessed using the Rest-Q, a validated questionnaire based on stress-recovery responses. A longitudinal analysis revealed significant changes in the general and specific-stress scales for all participants throughout the experiment with a critical stage from supine to standing posture leading to a …

Analysis of the traditional approaches for astronauts’ personal hygiene in outer space

2016

Various approaches adopted in the years for astronauts' personal hygiene in microgravity conditions are revisited and analysed in this paper. For each approach, benefits, critical aspects of sanitation and comfort, along with the possibility of recycling the amount of used water, are discussed and evaluated.

Biological and Mechanical Characterization of the Random Positioning Machine (RPM) for Microgravity Simulations

2021

The rapid improvement of space technologies is leading to the continuous increase of space missions that will soon bring humans back to the Moon and, in the coming future, toward longer interplanetary missions such as the one to Mars. The idea of living in space is charming and fascinating; however, the space environment is a harsh place to host human life and exposes the crew to many physical challenges. The absence of gravity experienced in space affects many aspects of human biology and can be reproduced in vitro with the help of microgravity simulators. Simulated microgravity (s-μg) is applied in many fields of research, ranging from cell biology to physics, including cancer biology. In…