noun
isotonic drink
A sports drink formulated to quickly replenish fluids and electrolytes; common in athletic and health contexts.
運動後はアイソトニック飲料で水分補給をする。
After exercise, I rehydrate with an isotonic drink.
スポーツドリンク is a broader term for sports drinks, while アイソトニック飲料 specifically refers to drinks with an osmotic pressure similar to body fluids for rapid absorption.
Compound of English-derived アイソトニック (isotonic) and 飲料 (beverage).