Pengaruh Hibiscus sabdariffa Linn. terhadap Stres Oksidatif Jantung Tikus pada Kondisi Overtraining: Kajian terhadap Malonildialdehid (MDA), Superoxide Dismutase (SOD), Glutathione (GSH), dan NADPH Oxidase (Nox2) = Effect of Hibiscus sabdariffa Linn. on Oxidative Stress in heart of Overtrained Rat: Study on Malonildialdehyde (MDA), Superoxide Dismutase, Glutathione (GSH) and NADPH Oxidase 2 (Nox2)