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Gravity will pull the blood back into an individual's legs, ankles and feet. This forces the veins to expand or "balloon" to accommodate this extra blood. The valves of the veins work best in concert with accompanying muscle contractions that force the blood to continue moving up the leg. Standing with some muscles constantly strained weakens ...
Reflex syncope can occur in otherwise healthy individuals, and has many possible causes, often trivial ones such as prolonged standing with the legs locked. [ citation needed ] The main danger of vasovagal syncope (or dizzy spells from vertigo) is the risk of injury by falling while unconscious.
These processes cause the typical symptoms of fainting: pale skin, rapid breathing, nausea, and weakness of the limbs, particularly of the legs. [3] If the ischemia is intense or prolonged, limb weakness progresses to collapse. [3] The weakness of the legs causes most people to sit or lie down if there is time to do so.
Disuse is a common cause of muscle atrophy and can be local (due to injury or casting) or general (bed-rest). The rate of muscle atrophy from disuse (10–42 days) is approximately 0.5–0.6% of total muscle mass per day although there is considerable variation between people. [5]
For many decades, the physical mechanism that causes the cracking sound as a result of bending, twisting, or compressing joints was uncertain. Suggested causes included: Cavitation within the joint—small cavities of partial vacuum form in the synovial fluid and then rapidly collapse, producing a sharp sound. [5] [6] Rapid stretching of ...
Chronic venous insufficiency (CVI) is a medical condition characterized by blood pooling in the veins, leading to increased pressure and strain on the vein walls. [1] The most common cause of CVI is superficial venous reflux, which often results in the formation of varicose veins, a treatable condition. [2]
What to know about the quadratus lumborum a.k.a. the QL, a deep low back muscle that can cause pain during rides. These QL stretches and exercises can help.
Tabletop leg press press - Lying on the back, bring both knees towards the chest and then straighten both legs (such that legs are hanging in the air), whilst keeping the back flat on the ground. Clamshell - Whilst lying on the side with knees bent inwards, bring the top knee up (whilst keeping leg bent) and hold for 3 seconds.