2022. USING VARIABLE RATIOS IN PERIODS OF WORK TO REST AND ITS REFLECTION TO DEVELOPING SOME PHYSICAL VARIABLES FOR HANDBALL PRACTITIONERS AGED 40-50 YEARS. ResearchJet Journal of Analysis and Inventions. 3, 06 (Jun. 2022), 1–12. DOI:https://doi.org/10.17605/OSF.IO/FV7W4.