ABC | Volume 110, Nº4, April 2018

Original Article Winter et al High-intensity training after AMI Arq Bras Cardiol. 2018; 110(4):373-380 Graph 1 – Comparison between the pre and post-training CTG lactate tests. 9 8 7 6 5 5 4 4 3 3 2 2 1 1 0 Pre Post 4.18 4.24 5.85 5.18 8.08 8.4 5.82 5.97 5.85 Lactate dosimetry (mmol) Graph 2 – Comparison between pre-versus post-training CTG. 9 8 7 6 5 5 4 4 3 3 2 2 1 1 0 3.83 3.96 5.07 5.9 7.32 8.11 5.66 5.67 5.74 Sessions 1 Sessions 2 Lactate dosimetry (mmol) duration), initiated early or delayed, on ventricular function and mortality. The authors demonstrated that 1) neither infarction nor exercise had any effect on the animals’ survival; 2) in rats with small infarcts, left ventricular volume and shape, and long‑term survival were not altered by chronic exercise initiated early or late after coronary artery ligation; 3) Mortality rose in animals with large infarction as a result of exercise (p < 0.0001) and was 47.6%with early exercise and 26.7%with late exercise (p < 0.05, early versus late). It is of note that findings of left ventricular volume reported by Gaudron et al. 14 are similar to those described in our study, since no differences between pre- and post-training in cavity diameter were found in the training groups (ITG and CTG). On the other hand, mortality rates were different, since no deaths occurred in the present study. This may be explained by different training volumes between their study by Gaudron et al., 14 and ours; in their study, the animals underwent continuous training for 90 minutes, with no progression or periodization program, whereas in our study, the maximum training period was 20 minutes, completed after a periodization program with progressive loads. The development of a training program in a subjective manner, without load (intensity and/or volume) individualization or progression, andwithout temporal organization (periodization) should be considered inadequate, since the effects of training may be underestimated by an arbitrary exercise prescription. Therefore, studies in which exercises are prescribed in such arbitrary manner may yield inconsistent results, as exercises may be less effective than expected. Therefore, aiming to provide the most effective exercise prescription, we elaborated an individualizedmethod of exercise assessment and prescription. First, the animals underwent a LT test with incremental load before training. Based on this LT results and training group allocation (CTG or ITG), the optimal training load of each animal was defined. The model of load progression adopted was the volume progression (every two weeks) according to the pre-established periodization. 377