Author/Editor		Ušaj, A; Starc, V
Title		Blood pH and lactate kinetics in the assessment of running endurance
Type		članek
Source		Int J Sports Med
Vol. and No.		Letnik 17, št. 1
Publication year		1996
Volume		str. 34-40
Language		eng
Abstract		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 runners participated 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 predict the capabilities of runners with respect to the two endurance performance types: long and short.
Descriptors		RUNNING PHYSICAL ENDURANCE HEART RATE LACTATES SPORTS HYDROGEN-ION CONCENTRATION