## 4 Discussion  
In recent years, therapeutic programs based on rowing have been proposed as a type of non-pharmacological strategy that modulates adverse effects in female breast cancer survivors by involving moderate-intensity physical exercise that combines aerobic and muscle strength training [35]. The potential of this activity lies in a viable, sustainable, and safe model that can be tolerated by different age groups [7; 35; 44]. Consequently, recent studies have shown, after 4 years of follow-up, that women who participated in dragon boat training were able to maintain their cardiac parameters within normal ranges for their age (compared to healthy active individuals), despite chemotherapy treatment, in addition to not developing any type of cardiac condition during this period [44]. Other studies, conducted over 12 weeks in this type of vessel, have reported a 30% improvement in cardiorespiratory capacity, also measured through the 6 MWT [4]. Despite these improvements, there are no studies that verify which type of boat is more suitable when designing novel therapeutic programs based on rowing activity, since the muscle groups and exercise dynamics involved in fixed seat rowing differ from rowing on a sliding seat. With this in mind, statistically significant improvements in cardiac function, systolic and diastolic blood pressure, and cardiorespiratory capacity can be observed when analyzing the results of our study. These improvements after implementation of the intervention protocol occur in both the FSR group and the rowers who participated in the SSR. When comparing the groups, a higher rate of improvement in resting heart rate can be seen in the FSR group, while the female breast cancer survivors who participated in the SSR group had greater improvements in the variables of heart rate before and after the 6 MWT, systolic and diastolic blood pressure, and distance traveled in the 6 MWT (directly correlated with the cardiorespiratory capacity and VO2 max of the subjects). According to the data, although the rowing activity itself can promote cardiac adaptations that optimize the functioning of the cardiovascular system, with the SSR modality, greater adaptations occur comparatively considering the same time span (12 weeks). Cardiac function adaptations were also found after a 12-week intervention when we compared the results, focusing on the variables of our study, with previous studies that used rowing training programs in breast cancer survivors [48]. The results showed a 10%  
Figure 4: Comparison of blood pressure before and after rowing training according to boat type. BP = blood pressure; FSR= fixed seat rowing; SSR = sliding seat rowing. \({}^{**}\)\(p\) < 0.001.  
improvement in the systolic and diastolic blood pressure of the participating women. These results are consistent with other rowing studies, such as those by [PERSON] et al. [44], which showed significant improvements in diastolic function in women breast cancer survivors treated with chemotherapy after 4 years of dragon boat training [44], or by [PERSON] et al. [49], who found that a 16-week resistance training program improved systolic and diastolic blood pressure by 5% in breast cancer survivors. These results indicate the positive impact that a professionally supervised intervention program based on rowing could have on myocardial function, even in women previously treated with chemotherapy [44]. This is important because one of the main problems associated with oncological treatments is chemotherapy-induced cardiotoxicity, which has direct and indirect adverse effects on the cardiovascular system [9; 50; 51]. As an example, it has been shown that the incidence of left ventricular dysfunction among patients treated with certain anticancer drugs, such as high-dose doxorubicin (700 mg/m\({}^{2}\)), can reach 48%. The incidence of myocardial ischemia due to 5-fluorouracilcil (5-FU) can be as high as 10% [52; 53].