Mulyawan, R., Prasetyo, Y., Arjuna, F., Sumaryanti and Nugroho, S. (2021) “Fitness level and the relationship between heart rate, body water, dehydration symptoms in adolescents during a pandemic”, Jurnal SPORTIF : Jurnal Penelitian Pembelajaran, 7(3), pp. 347 - 366. doi: 10.29407/js_unpgri.v7i3.16586.