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  • Blood pH and lactate kinetics in the assessment of running endurance
    Ušaj, Anton ; Starc, Vito
    To study how two types of testing protocols for the determination of the (LA) and blood pH kinetics during running match each other, a group of nine runnersparticipated in two testing protocols. The ... first protocol consisted of a sequences of 8 x 2000 m runs at constant speed, which was increased on different testing days. The first protocol was used for the determination of running speed (v), (LA), pH and heart rate (HR) corresponding to the Lactate Threshold (LT) and the Threshold of Acidosis (TA), both occurring at similar running speeds (4.21+-0.44 and 4.22+-0.40 m/s) (mean+-SD) and HR (159+-7 and 160+-9 1/min), (LA) = 2.0+-0.6 mmol/l and pH = 7.411+-0.018. Maximal steady values for (LA) (maxLAss) and minimal steady values for pH (MinpHss) obtained by the second protocol were higher (p=0.01) according to running speed (4.62+-0.38 and 4.66+-0.38 m/s), HR (172+-7 and 174+-8 1/min) and (LA) (5.7+-1.3 mmol/l) and lower according to pH (7.364+-0.021), respectively. Unlike similar running speeds determineed by LT and TA, the minimal steady pH level occurred at a slightly higher speed than the speed at amxLAss. Additionally, we found a drift of pH towards a resting level, when (LA) fluctuated around a steady level. Furthermore, the parameters of pH kinetics correlated better with the running speed of the 400 m run that was taken as the parameter of short endurance performance, than those of (LA) kinetics. We conclude that these differences in (LA) and pH kinetics could serve to predictthe capabilities of runners with respect to the two endurance performance types: long and short.
    Vir: International journal of sports medicine. - ISSN 0172-4622 (Let. 17, št. 1, 1996, str. 34-40)
    Vrsta gradiva - članek, sestavni del
    Leto - 1996
    Jezik - angleški
    COBISS.SI-ID - 83929

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