Table 1. Physical and physiological characteristics of the subjects divided by subgroups and gender. Data are means (±SD). Variables M1 (n=29) M2 (n=12) F1 (n=21) F2 (n=9) Age (years) 13.6 (2.1) 14.3 (1.9 ) 13.3 (2.0) 13.3 (2.6) Body Mass (kg) 56.6 (16.4) 55.1 (12.1) 51.3 (9.3) 52.1 (13.5) Height (m) 1.65 (.14) 1.66 (.10) 1.58 (.09) 1.57 (.10) Body Fat (%) 14.2 (6.2) 13.0 (5.1) 23.4 (6.5) * 22.6 (6.0) †  Experience (years) 5.1 (3.4) 5.4 (3.2) 4.3 (2.3) 3.8 (2.9) S100 (m·s-1) 1.33 (.19) 1.42 (.18) 1.20 (.10) * 1.23 (.09) †  S200 (m·s-1) 1.20 (.18) 1.27 (.18) 1.10 (.09) * 1.10 (.07) †  S400 (m·s-1) 1.12 (.17) 1.18 (.18) 1.03 (.10) * 1.03 (.08) †  LM(m·s-1) 1.04 (.12) 1.11 (.14) 1.00 (.08) 1.01 (.07) M1 = Male subgroup 1; M2 = Male subgroup 2; F1 = Female subgroup 1; F2 = Female subgroup 2; S100 = average speed from 100-m maximal performance; S200 = average speed from 200-m maximal performance; S400 = average speed from 400-m maximal performance; LM = swimming speed corresponding to lactate minimum. < 0.05 comparing F1 and M1; p < 0.05 comparing F2 and M2.