Title: Use of MOXY monitor for evaluation of oxygenation of finger flexors during incremental climbing load. Objectives: The aim of the work was to assess the dynamics of muscle oxygenation using MOXI monitor and Portamon during incremetal climbing load Methods: The test involved 19 individuals (14 male (M) and 5 female (F), age 29,5 ± 8,5 (years) M, 26,5 ± 5,7 (years) F, weight 70,2 ± 7,9 (kg) M and 58,1 ± 2,4 (kg) F, height 176,9 ± 5,6 (cm) M, 170,2 ± 1,3 (cm) F, length of climbing experience 12,1 ± 7,1 years M 9,8 ± 4 F, performance on the Union International des scale Associations d'Alpinisme (UIAA) 6+ to 10 M and 7 to 9 F). Climbers underwent test climbing on a climbing ergometer at submaximal load (vertical, 9 m / min) and a incremental climbing test to a subjective maximum. Tissue saturation in the flexor digitorum profundus (FDP) and extensor digitorum communis (EDC) was assessed by near-infrared spectroscopy with a Portamon and MOXY instrument. Results: In 5 of the 19 tested, it was not possible to determine the oxygenation breakpoint using the MOXY record. Compared to Portamon, the difference in threshold values ranged from 0-9ř. Conclusion: Due to the unclear breakpoint in oxygenation in some respondents and the small agreement with the Portamon device, MOXY cannot be used to evaluate...