Table 3. Work economy, peak oxygen uptake in swimming and maximal heart rate. All data are presented as mean (standard deviation).
Intervention group Control group
All (n = 11) Female(n = 5) All (n = 9) Female (n = 7)
Cs at 1.1 m·s-1(mL·m-1) Pre 43.9 (6.3) 39.7 (4.1) 38.4 (8.9) 35.2 (7.1)
Post 42.7 (6.6) 38.3 (3.5) 39.1 (6.3) 36.8 (5.1)
Cs at 1.1 m·s-1(mL· -1·kg-1) Pre 0.75 (.09) .74 (0.11) .66 (.13) .63 (.13)
Post 0.72 (.06) .72 (0.08) .66 (.12) .65 (.14)
VO2peak(L·min-1) Pre 3.26 (.64) 2.80 (0.20) 3.03 (.39) 2.87 (.15)
Post 3.28 (.69) 2.75 (0.30) 2.97 (.46) 2.77 (.16)
VO2peak(mL·kg-1·min-1) Pre 55.2 (4.6) 52.2 (3.8) 52.2 (5.0) 51.5 (5.3)
Post 55.0 (5.8) 51.5 (6.6) 50.0 (6.2) 48.7 (6.4)
VE(L·min-1) Pre 97.4 (18.2) 86.2 (5.0) 94.2 (11.7) 90.3 (6.7)
Post 105.5 (19.7)** 92.3 (10.3) 91.9 (16.8) 85.7 (10.9)
R Pre 1.14 (.06)† †  1.14 (.04)†  1.07 (.07)† †  1.04 (.03)† 
Post 1.13 (.09)† †  1.10 (.08)† †  1.03 (.09)*† †  1.00 (.02)*† † 
vVO2peak(m·s-1) Pre 1.31 (.08) 1.28 (.08) 1.28 (.11) 1.27 (.10)
Post 1.32 (.07) 1.28 (.07) 1.29 (.12) 1.26 (.11)
HRmax(beats·min-1) 194 (7) 195 (5) 186 (5) 188 (5)
C: Cost of swimming, m·s: meters per second, mL·m: millilitres per meter, VO: Peak oxygen uptake in swimming, L·min: liters per minute, V: Pulmonary ventilation, R: Respiratory exchange ratio, vVO: velocity during VO –measurement, HR: maximal heart rate during swimming, min: minute. * Significant change in group at p < 0.05. ** Significant change in group at p < 0.01. †  Significant difference between intervention group and control group at p < 0.05. † †  Significant difference between intervention group and control group at p < 0.01.