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The Journal of Sports Medicine and Physical Fitness 2001 December;41(4):463-9

Copyright © 2002 EDIZIONI MINERVA MEDICA

lingua: Inglese

Seasonal variation in fitness variables in professional soccer players

Casajús J. A.

From the EU Profesorado EGB Zaragoza, Universidad de Zaragoza, Medical Sport Center of Government of Aragon, Zaragoza, Spain


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Back­ground. ­There ­have ­been ­many ­studies on ­soccer, but few eval­u­a­tions of the phys­io­log­ical func­tion of pro­fes­sional ­soccer ­players. The aim of ­this ­work was to eval­uate sea­sonal vari­a­tion — ­from Sep­tember to Feb­ruary — in anthro­po­metric and phys­io­log­ical var­i­ables in a ­Spanish pro­fes­sional ­soccer ­team (n=15).
­Methods. Anthro­po­metric meas­ure­ments ­were ­obtained fol­lowing the stan­dar­dised tech­niques ­adopted by the Inter­na­tional ­Society for the Advance­ment of Kinan­thro­pom­etry (ISAK). A max­imal tread­mill ­test ­with ­breath-by-­breath gas anal­ysis was car­ried out to eval­uate the ­aerobic con­di­tion and a ­Jump ­test was ­used to ­measure ­muscle per­for­mance and ­strength in the ­lower ­limbs.
­Results. ­There ­were no sig­nif­i­cant vari­a­tions in ­body ­mass, ­although a sta­tis­ti­cally sig­nif­i­cant ­decrease (p<0.05) in fat per­centage and sum of six skin­folds was ­observed. The somat­o­type (­Heath-­Carter) was mes­o­mor­phic ­without any ­change ­observed ­throughout the ­season. The ­mean V.O2max in the ­first ­test (65.5 ml·kg-1·min-1) had not ­changed by the ­second one (66.4 ml·kg-1·min-1). ­There ­were no sig­nif­i­cant dif­fer­ences in max­imal ­heart ­rate (185 vs 185 ­beats·min-1) and tread­mill ­speed at V.O2max (16.1 vs 15.8 km·h-1). At the anaer­obic ­threshold, ­there ­were sig­nif­i­cant dif­fer­ences (p<0.05) in ­speed (12.4 vs 13.1 km·h-1) and ­heart ­rate (164 vs 168 ­beats·min-1) as the ­season pro­gressed. ­When the ­data ­were ­expressed as a per­centage of max­imal ­values ­obtained, we ­observed ­that the ­speed in the ­first ­test was 77 and 83% in the ­second ­test. For ­heart ­rate, ­values ­were 89 and 91%, and for ­oxygen ­uptake 77 and 79%. The ­Jump ­test did not ­show any sig­nif­i­cant ­change ­during the ­season.
Con­clu­sions. We can con­clude ­from ­these ­results ­that pro­fes­sional ­soccer ­players ­have ­good fit­ness ­from the begin­ning of the ­Spanish ­League — ­with a ­high V.O2max — and the ­changes ­observed ­depend on the ­initial ­values.

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