A total of 11 young males (23.1±2.7 years old; 1.79±0.07 m; 75.6±8.0 Kg; and 23.3±3.71 Kg.m-2) participated in the study. The volunteers were acquainted with resistance training, which they performed on a regular basis at least twice per week (number of days/week: 3.36±1.12) over 3 to 5 months prior to the beginning of the study. The volunteers had no history of lower limb injuries, surgery, or fractures and were not using any medications that could compromise the findings of the study. In addition, individuals with heart or respiratory problems, vestibular or visual dysfunction, or physical impairment, as well as users of medications that interfere with the state of wakefulness and balance (and could therefore interfere with the performance of tests), were excluded. The exclusion criteria were applied following interviews conducted with the volunteers; therefore, their potential unawareness of any of the abovementioned conditions was ruled out. All volunteers agreed to participate in the study and signed an informed consent form approved by the Ethics Committee of the State University of Londrina (Universidade Estadual de Londrina - UEL), Londrina, State of Paraná-PR, Brazil (ruling 94,191, CAAE [Certificado de Apresentação para Apreciação Ética / Certificate of Presentation for Ethical Consideration] 02986012.3.0000.5231).
The volunteers were instructed to not perform moderate or intense physical activity 24 hours before the period of data collection and avoid the ingestion of alcoholic beverages and medications liable to affect balance. The sample included only males because the genders have been shown to differ with regard to the ability to reach and tolerate fatigue