All articles tagged with #exercise physiology
Research from the University of Illinois Urbana-Champaign indicates that muscle and liver cells retain a record of past training, allowing individuals to regain fitness faster after periods of inactivity. This 'exercise memory' helps improve endurance, regulate blood sugar, and slow weight regain, challenging the traditional 'use it or lose it' view of physical fitness.
The brain’s glymphatic system, a network of spaces around blood vessels, clears metabolic waste using cerebrospinal fluid. Its function declines with age and can be impaired by inflammation or poor cardiovascular health, contributing to neurodegenerative diseases. Three science-backed methods to enhance this system include prioritizing non-REM sleep, engaging in consistent moderate-intensity exercise, and practicing deep breathing techniques.
New research reveals that regular and intense exercise fundamentally alters immune cell behavior and metabolic pathways. A study in Science Advances shows that consistent activity boosts antioxidant levels and sugar metabolism, making immune cells more vigilant. Concurrently, research in Cell Reports Medicine indicates that brief, high-intensity bursts trigger massive protein changes in the blood, outperforming long moderate sessions in signaling between organs. These findings suggest that exercise intensity and consistency offer distinct but complementary benefits for preventing chronic diseases like diabetes and heart disease.
A study in PNAS reveals that core abdominal muscle contractions, such as those during exercise or coughing, cause ultrafast constriction in major brain veins. This mechanical coupling between the torso and skull challenges the view of cerebral veins as passive drainage channels and offers insights into exercise benefits and migraine triggers.
The social-media trend 'lymphatic walking' promotes arm-swinging, upright posture, and deep breathing to move lymph; while muscle activity and breathing can aid lymph flow, there is no evidence this specific walking style outperforms ordinary walking for healthy people. The takeaway is to move regularly and purposefully, since movement supports lymph drainage, cardiovascular health, and overall resilience.
A mouse study shows B cells, beyond their immune role, may regulate muscle endurance; mice with reduced B cells or treated to deplete them showed decreased running endurance, suggesting an unexpected bridge between the immune system and exercise metabolism.
Scientists have discovered that vampire bats use blood-derived amino acids as their primary energy source, rather than carbohydrates or fats, to fuel physical activity. This was determined by observing the bats on treadmills and measuring their metabolic activity. The study found that the bats rapidly oxidize amino acids from their blood meals, similar to bloodsucking insects, highlighting a unique adaptation among mammals.
A new study reanalyzing lung-function tests found that about a third of healthy adults experience air hunger during all-out exercise, with the fittest people being most susceptible. This feeling, associated with lung conditions, can limit performance and is linked to a negative emotional response. The study suggests that fitter individuals may push themselves harder, reaching their breathing limits, and raises questions about the factors determining air hunger and potential interventions, such as training breathing muscles or using asthma medication.
Contrary to popular belief, lactic acid is not responsible for muscle soreness after exercise. Research shows that the discomfort is caused by a buildup of pressure and chemical by-products in muscle cells, leading to microscopic damage and delayed onset muscle soreness (DOMS). This soreness has nothing to do with lactic acid or lactate, and the good news is that muscles adapt rapidly to reduce discomfort with regular activity. It's important to train gradually and consistently to prevent DOMS and enjoy exercise more, while removing the myth of lactic acid's role in muscle soreness from exercise vocabulary.