isotonic
[/ˌaɪsoʊˈtɑːnɪk/]
adjective
isotônico
1. Having equal osmotic pressure; relating to solutions that have the same concentration of solutes as another solution
The isotonic saline solution is commonly used in medical treatments.
A solução salina isotônica é comumente usada em tratamentos médicos.
2. In physiology, relating to muscle contractions where tension remains constant while length changes
Isotonic exercise involves movement against constant resistance.
O exercício isotônico envolve movimento contra resistência constante.
3. In chemistry and biology, having the same osmotic concentration as a given solution
Red blood cells maintain their shape in isotonic solutions.
As células vermelhas do sangue mantêm sua forma em soluções isotônicas.
The term 'isotonic' is primarily used in medical, scientific, and fitness contexts in both Brazil and the USA. In fitness culture, 'isotonic exercise' is a common term referring to exercises like weightlifting where muscles work against constant resistance. In Brazil, sports drinks are often marketed as 'bebidas isotônicas' (isotonic drinks) for rehydration during physical activity. The term is highly technical and maintains consistent usage across English and Portuguese-speaking scientific communities.
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