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American astronaut Marsha Ivins demonstrates the effects of microgravity on her hair in space. The effects of spaceflight on the human body are complex and largely harmful over both short and long term. [1] Significant adverse effects of long-term weightlessness include muscle atrophy and deterioration of the skeleton (spaceflight osteopenia). [2]
The sensation of lightheadedness can be short-lived, prolonged, or, rarely, recurring. In addition to dizziness, the individual may feel as though their head is weightless. The individual may also feel as though the room is "spinning" or moving . Most causes of lightheadedness are not serious and either cure themselves quickly or are easily ...
Other psychosocial studies involving astronauts and cosmonauts have been conducted. In one, an analysis of speech patterns as well as subjective attitudes and personal values were measured in both on-orbit space crews and people working in space analog environments. The researchers found that, over time, these isolated groups showed decreases ...
If you find yourself feeling lightheaded and off-balance on a regular basis, it’s important to get to the root cause of why. It can also be helpful to know what to do when lightheadedness hits.
Most people have felt woozy or lightheaded at least once in their lives. But feeling dizzy several times a month is much more common in people over age 65 — and it’s a big reason for seeing ...
Dizziness is an imprecise term that can refer to a sense of disorientation in space, vertigo, or lightheadedness. [1] It can also refer to disequilibrium [2] or a non-specific feeling, such as giddiness or foolishness. [3] Dizziness is a common medical complaint, affecting 20–30% of persons. [4]
Bed rest unloading causes a significant loss of body nitrogen and lean body mass. [21] [52] [53] A reduction in the size or volume of the ambulatory muscles accounts for most of the decrease in lean body mass after bed rest. [21] [54] This decrease correlates with a significant reduction in muscle protein synthesis.
Spatial orientation (the inverse being spatial disorientation, aka spatial-D) is the ability to maintain body orientation and posture in relation to the surrounding environment (physical space) at rest and during motion. Humans have evolved to maintain spatial orientation on the ground.