Sport Mont 2023, 21(1), 9-15 | DOI: 10.26773/smj.230202  Abstract The military parachutists are responsible of special air operations who require certain capabilities in their physical condition, due to their intense professional career. The analysis of oxygen con-sumption (VO2) and heart rate (HR) allows the determination of aerobic (VT1) and anaerobic (VT2) thresholds and used to study the adequacy of the organism to exercise and in the analysis of sporting performance. The aim of this study was to determine the effect of tactical equipment on the stress test performance of elite parachutists. 10 parachutists parti-cipated in the study, between 22 and 36 years old with an average of 27.75 years (±4.20). Anthropometric values were determined of: weight 75.69 kg (±8.79), height 173.34 cm (±5.72) and body mass index (BMI) 25.23 (±2.98). Each one, performed 2 maximal treadmill exercise testing: one a conventional stress test (A) and another with the tactical equipment (weight 20 kg) (B). We obtained maximum oxygen consumption (Metalyzer 3B) and monitored the electrocardiogram continuously. The test started at a speed of 6km/h and a slope of 1%. The results of the two test were compared. The average value and standard deviation (SD) of different variables with equipment (B) and without it (A) and p-value were obtained: velocity (A: 14.80±3.29; B: 11.50±1.42 Km/h; p=0.073), HR (A: 182.7±58.62; B: 177.75±9.71 b/m; p=0.038), VO2 (A: 51.75±13.60; B: 54.00±30.82 ml/Kg/min; p=0.891). Al-so, the values of ventilatory thresholds: VT1 and VT2 of both tests were obtained, with sig-nificant differences. Tactical equipment causes a decrease in stress test performance with changes in VT1 and VT2.  Keywords military parachutist, oxygen consumption, ventilatory thresholds, stress test    View full article (PDF – 356KB)  References Álvarez, R., Campos, D.C., Portes, P., Rey, R., &amp; Martín, B. (2016). Análisis de parámetros fisiológicos en jugadores juveniles españoles de bádminton. Revista Internacional de Medicina y Ciencias de la Actividad Física y del Deporte, 16(61), 44-5.  Alves, J., Barrientos, G., Toro, V., Sánchez, E., Muñoz, D., &amp; Maynar, M. (2021). Changes in anthropometric and performance parameters in high-level endurance athletes during a sports season. International Journal of Environmental Research and Public Health, 18(5), 2782.  Anselmi, F., Cavigli, L., Pagliaro, A., Valente, S., Valentini, F., Cameli, M. &amp; D’Ascenzi, F. (2021). The importance of ventilatory thresholds to define aerobic exercise intensity in cardi-ac patients and healthy subjects. Scandinavian Journal of Medicine &amp; Science in Sports, 31(9), 1796-1808.  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The military parachutists are responsible of special air operations who require certain capabilities in their physical condition, due to their intense professional career. The analysis of oxygen con-sumption (VO2) and heart rate (HR) allows the determination of aerobic (VT1) and anaerobic (VT2) thresholds and used to study the adequacy of the organism to exercise and in the analysis of sporting performance. The aim of this study was to determine the effect of tactical equipment on the stress test performance of elite parachutists. 10 parachutists parti-cipated in the study, between 22 and 36 years old with an average of 27.75 years (±4.20). Anthropometric values were determined of: weight 75.69 kg (±8.79), height 173.34 cm (±5.72) and body mass index (BMI) 25.23 (±2.98). Each one, performed 2 maximal treadmill exercise testing: one a conventional stress test (A) and another with the tactical equipment (weight 20 kg) (B). We obtained maximum oxygen consumption (Metalyzer 3B) and monitored the electrocardiogram continuously. The test started at a speed of 6km/h and a slope of 1%. The results of the two test were compared. The average value and standard deviation (SD) of different variables with equipment (B) and without it (A) and p-value were obtained: velocity (A: 14.80±3.29; B: 11.50±1.42 Km/h; p=0.073), HR (A: 182.7±58.62; B: 177.75±9.71 b/m; p=0.038), VO2 (A: 51.75±13.60; B: 54.00±30.82 ml/Kg/min; p=0.891). Al-so, the values of ventilatory thresholds: VT1 and VT2 of both tests were obtained, with sig-nificant differences. Tactical equipment causes a decrease in stress test performance with changes in VT1 and VT2.