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Table 1 Performances at peak age in freestyle, breaststroke, individual medley, backstroke, and butterfly were correlated with number of different swimming strokes and race distances used at competitions during the various age categories

From: Variation vs. specialization: the dose-time-effect of technical and physiological variety in the development of elite swimmers

Performance at peak age

Age groups [years]

10–14

15–17

18–20

21–26

Females

 Number of different swimming strokes (technical variety)

  Freestyle

− 0.15***

− 0.22***

− 0.22***

− 0.24***

  Breaststroke

− 0.04

− 0.14*

− 0.21***

− 0.20***

  Individual Medley

− 0.05

− 0.12***

− 0.12***

− 0.16***

  Backstroke

− 0.11*

− 0.19***

− 0.23***

− 0.25***

  Butterfly

− 0.19***

− 0.27***

− 0.30***

− 0.24***

 Number of different race distances (physiological variety)

  Freestyle

0.07

0.06

0.09**

0.07*

  Breaststroke

0.12

− 0.03

− 0.03

− 0.05

  Individual Medley

0.07

− 0.05

− 0.05

− 0.07*

  Backstroke

0.09*

− 0.08

− 0.17***

− 0.16***

  Butterfly

− 0.06

− 0.23***

− 0.22***

− 0.20***

Males

 Number of different swimming strokes (technical variety)

  Freestyle

0.02

− 0.12***

− 0.16***

− 0.16***

  Breaststroke

0.05

− 0.25***

− 0.19***

− 0.28***

  Individual Medley

0.05

− 0.07

0.04

0.05

  Backstroke

0.03

− 0.14*

− 0.08

− 0.02

  Butterfly

0.04

− 0.16**

− 0.14*

− 0.22***

 Number of different race distances (physiological variety)

  Freestyle

0.14***

0.10**

0.17***

0.15***

  Breaststroke

0.11

− 0.09

− 0.03

− 0.05

  Individual Medley

0.17**

0.09*

0.16***

0.17***

  Backstroke

0.08

− 0.03

0.00

0.08

  Butterfly

0.07

− 0.08

− 0.05

− 0.15**

  1. Statistical significance: * P < 0.05; ** P < 0.01; *** P < 0.001