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. 2010 Jan 20;5(1):e8800. doi: 10.1371/journal.pone.0008800

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Berthelot et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Inline graphic — A. Secular evolution of for T&F (black dots); B. Evolution of for swimming (red squares). Both evolutions are given with a 60 Hertz, second order low pass Butterworth filter. Besides the initial era (1890–1910), 4 peaks (p₁–p₄) appear in T&F. Swimming curve (B) does not show any trend over the years. The 1994 peak is mainly related to Chinese swimmers, who performed very high performances (also observable in 1993 (p₄) in T&F).

A. Secular evolution of for T&F (black dots); B. Evolution of for swimming (red squares). Both evolutions are given with a 60 Hertz, second order low pass Butterworth filter. Besides the initial era (1890–1910), 4 peaks (p₁–p₄) appear in T&F. Swimming curve (B) does not show any trend over the years. The 1994 peak is mainly related to Chinese swimmers, who performed very high performances (also observable in 1993 (p₄) in T&F).