Pengaruh latihan fisik aerobik pada tikus juvenile dan dewasa muda terhadap morfometrik, histopatologi, deposisi matriks ekstraseluler, serta ekspresi connexin43 di jantung = Effects of aerobic exercise on morphometric histopathologic extracelullar matrix deposition and connexin43 expression in heart of juvenile and young adults rats / Rustiana Tasya Ariningpraja