Improving the training process of power sports athletes based on their biorhythms Journal title: Slobozans`kij Naukovo-Sportivnij Visnik [Slobozhanskyi Herald of Science and Sport] Authors: Oleksandr Piven| Харківська державна академія фізичної культури, Viktor Dzhym| Харківська державна а... Subject(s): Education, Sports and Recreation, Rehabilitation, Health and Wellness