Biomechanics and Medicine in Swimming XI

BiomechanicsandmedicineinswimmingXi
allowed between tests. Swimmers were not tested if they didn’t feel completely
recovered after the first tested distance.
On a following day swimmers performed five repetitions of 400 m
or 300 m with an interval of 30-40 s (5x400 m, Y and A groups; 5x300
m, C group). During the set the swimmers were guided to maintain CV.
The 300-m distance was used for children swimmers in order to keep
the duration of each repetition similar among groups. A capillary blood
sample was taken from a finger-tip after each 400 or 300 m repetition. The
short resting interval between repetitions was used for blood sampling
(30-40 s). The blood sample was immediately mixed with 10 volumes of
0.3 mol·l -1 perchloric acid and centrifuged at 1500 x g. The supernatant
was stored and later analysed spectrophotometrically at 340 nm wavelength
using reagents commercially available (Sigma, St Louis, MO). The
RPE was reported after each 300 or 400 m repetition on a 10-point scale.
A two-way analysis of variance for repeated measures (group x repetitions)
and the Tukey post-hoc test were used for statistical analysis.
The Pearson correlation coefficient was used to examine the relationship
between variables. The results are presented as mean±SD and the level
of significance was set at p0.05). Additionally,
the sustained actual velocity during the interval swimming set
of repetitions was not different from the CV, for all groups (Figure
1, p>0.05). The average time required to cover the 300 or 400 m distance
repetitions (C: 5.2±0.2 vs. Y: 5.8±0.4 and A: 5.6±0.3 min, p