Background: There is no Consensus in the Literature about the Role of the Phases of the Menstrual Cycle on the Aerobic Physical Performance and Hemodynamic Variables yet. Thus, we
Tested the Hypothesis that Menstruation Interferes in the Physical Capacity of Female Soccer Players.
Methods: The Sample Consisted of 18 Athletes that were Evaluated in Two Stages ( During the same Menstrual Cycle): During the Menstrual Period (DPM) and Outside the Menstrual Period
(FPM). Anthropometric Analyzes were Performed. The Measurements of Oxygen Consumption Maximum, Heart Rate, Blood Pressure and Total Test Time Monitored During Cardiological Evaluation Exercise.
Results: The Data of Weight and Body Mass Index were Similar between Periods (60.8 ± 0.3, vs. 61.2 ± 0.1 kg, P = 0:46) and (23.2 ± 0.3, vs. 23.7 ± 0.2 kg, P = 12:42). During Cardiac
Evaluation, VO2max and the Test Duration were Higher in FPM Group in Comparison with the DPM Group. (VO2max = 66.0 ± 0.4 vs. 62.2 ± 0.1 units, P = 0.03, Total Time = 14:00 ± 0.1, ± 0.3 vs. 12:00 min,
P = 0:04. DPM Group Responded with HR and Blood Pressure Peak Higher than FPM Group. (FCp=201±0.2 vs192±0.3 bpm, P=0.04), (190±0.2 vs 180±0.2 mmHg, P=0.04). Regarding the Deltas of the 1st and 2nd
Minute of HR Recovery DPM Group Showed Lower Values Compared to FPM Group. .(FCr1= -17±0.2 vs -26±0.2 bpm, P=0.02), (FCr2= -14±0.2 vs -22±0.2 bpm, P=0.01).
Conclusions: The Menstrual Cycle Interfered at Aerobic Performance, HR and BP of Professional Soccer Players, with Significant Difference in Test Effort between the Periods Evaluated,
Demonstrating the Influence of the Menstrual Period to the Body's Response to Exercise.