Research on human movement is quite complex, because human origins are not as deterministic as other (bio)mechanical systems; Assessing humans in an aquatic environment becomes even more difficult because it is not their natural environment and other physical principles must be considered. This makes competitive swimming one of the most difficult sports to perform scientific research on (Barbosa et al. 2011). In fact, the challenge of the present study was to evaluate the physiological and biomechanical behavior of competitive swimmers, in order to bridge the gap between theory and practice. To evaluate the chosen physiological and biomechanical parameters, the intermittent incremental protocol was the main tool used. in this study; the protocol was adapted from the 7x200 m crawl protocol validated by Cardoso et al. (2003) and, applied to competitive swimmers by Fernandes et al. (2003). Initially, this protocol was used to assess the maximum volume of oxygen consumption (VO2max) and corresponding swimming speeds (Fernandes et al., 2003), being considered achieved according to traditional primary and secondary physiological criteria (cf. Adams, 1998). ; Howley et al., 1995), in particular the appearance of a plateau in oxygen consumption despite an increase in swimming speed and high levels of blood lactic acid concentrations ([La-]≥8 mmol /l), high respiratory exchange rate (R ≥ 1.0), high heart rate (> 90% of [220-age]) and exhaustive perceived exertion. However, the primary objective was not to assess VO2max but to use the 7 x 200 m intermittent progressive protocol to assess AnT. In fact, the AnT assessment is one of the most used parameters determined by the 7x200m protocol (P...... middle of paper ......can reflect the skill and technique of swimmers to adopt a more streamlined position (cf. Zamparo et al., 2009); therefore, high values ​​of TI lead to higher hydrodynamic resistance and vice versa. It was observed that TI remained constant throughout the 7x200m protocol, which is not consistent with Zamparo et al. 2009). For the authors, with the increase in v, the TI tends to decrease. Under the effect of fatigue, the swimmer may pay less attention to body alignment, which leads to a less streamlined position (Craig et al., 1985). The 7 x 200 m intermittent incremental protocol should be considered as an accurate tool to assess individual biomechanical and physiological parameters and their interaction should be taken into account. However, future research could focus on connecting these parameters and understanding behavior before and after AnT..