Abstract
Background:The magnitude of long-term changes on aerobic endurance indices provides useful information for understanding any training-induced adaptation during maturation.Objective:The aim of the present study was to compare changes in different aerobic endurance indices within two successive training years.Methods:Eight swimmers, (five male, three female; age: 14.1±1.5, height: 163.8±9.9 cm, body mass: 55.8±10 kg) were tested at four time-points, before and after the 12-week specific preparation period, within two successive training years (at year-1: start-1, end-1, at year-2: start-2, end-2). In each time-point were timed in distances of 50, 200 and 400 m front crawl to calculate the critical speed (CS). Subsequently, performed 5x200 m front crawl progressively increasing intensity and the lactate concentration was determined after each repetition. Using the individual speedvs.lactate concentration curve, the speed corresponding to 4 mmol.L-1concentration (V4) and the speed corresponding to lactate threshold (sLT) were calculated.Results:Aerobic endurance was increased from year-1 to year-2 (effect of time, p<0.05) and no difference was observed between V4, sLT and CS at all time-points of evaluation (p>0.05). In year-1, V4, sLT and CS were unchanged even after the 12-week period (p>0.05). During year-2 of training it was only V4 that was increased from start-2 to end-2 (p<0.05), whereas sLT and CS were unchanged at the same period (p>0.05).Conclusion:The aerobic endurance indices change similarly throughout a two-year training, independent of the maturation. Possibly, V4 is more sensitive to detect training adaptations during the specific preparation period in young swimmers.
Highlights
Aerobic endurance development is critical for competitive swimming especially during childhood and adolescence and is frequently tested in swimmers of all ages [1, 2, 3]
The total distance of training within the 12-week period of training was similar in year-1 compared to year-2
The distance covered in each training intensity level was similar in year-1 compared to year-2 (Table 1)
Summary
Aerobic endurance development is critical for competitive swimming especially during childhood and adolescence and is frequently tested in swimmers of all ages [1, 2, 3]. Previous studies examined the effects of training on swimming endurance indices [7, 8] and have reported significant changes in CV and sLT after twelve weeks of training [7]. In this context, Toubekis et al [8] observed different rate of change in the aforementioned swimming endurance indexes after 14 weeks of training. The magnitude of long-term changes on aerobic endurance indices provides useful information for understanding any traininginduced adaptation during maturation
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