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The Journal of Sports Medicine and Physical Fitness 1999 June;39(2):128-32

lingua: Inglese

Plasma ­ammonia ­response to ­sprint swim­ming

Ring S. 1, Mader A. 1, Mougios V. 2

1 Depart­ment of Car­di­ology and ­Sports Med­i­cine, Sports Uni­ver­sity of ­Cologne, Ger­many;
2 Depart­ment of Phys­ical Edu­ca­tion and ­Sport Sci­ence, Aris­to­tele Uni­ver­sity of Thes­sal­o­niki, ­Greece


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Back­ground. To ­study the ­plasma ­ammonia ­response ­after ­sprint ­crawl swim­ming.
­Methods. ­Nine ­sprinters (S) and ten non-­sprinters (NS) com­pleted a 15-, a 25- and a 50-m ­crawl at max­imal inten­sity ­with a 10-min and a 15-min ­resting ­period ­inbetween. Cap­il­lary ­blood sam­ples ­were col­lected ­before and at reg­ular inter­vals ­after ­each ­effort for ­plasma ­ammonia deter­mi­na­tion.
­Results. ­Ammonia ­kinetics dif­fered ­among dis­tances, but not ­between ­groups, ­with ­peak ­values (­observed 2-8 min post­ex­er­cise) ­being ­higher ­after 50 m as com­pared to ­shorter dis­tances. Sig­nif­i­cant dif­fer­ences ­between S and NS ­were ­found in ­peak ­ammonia ­after 50 m (124.5±58.2 vs 98.7±6.3 ­µmoL-1) and in the ­change of ­ammonia rel­a­tive to ­swim ­time (ΔNH3/Δt) ­after 25 m (2.66±1.87 vs 1.49±0.84 ­μmol L-1 s-1) and 50 m (1.87± 1.33 vs 1.01±0.49 ­μmol L-1 s-1). ΔNH3/Δt was ­highest ­after 15 m (3.33±2.53 in S, 3.92±1.67 ­μmol L-1 s-1 in NS).
Con­clu­sions. ­These dif­fer­ences in the ­plasma ­ammonia ­response to ­sprint swim­ming ­according to dura­tion and ath­lete ­seem to be con­nected to dis­tinc­tions in ­muscle ­fiber pro­file and ­energy pro­viding pro­cesses.

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