Lactic acid as a systemic product and biomarker of physical load oleh Yu. R. Boretsky, I. Z. Hlozhyk, V. R. Hashchyshyn, R. I. Tymochko-Voloshyn, N. M. Paraniak, Kh. E. Shavel, M. V. Stefanyshyn, I. V. Verbin, V. A. Ivashchenko, G. Z. Gayda, M. V. Gonchar