Blood lactate concentration following maximum exercise in trained subjects.

Abstract

The time when blood lactate reaches peak concentration following maximum exercise is unclear. The post exercise venous blood lactate concentration was determined serially for 30 minutes in 13 trained men following maximum exercise on a motor driven treadmill. Lactates were determined enzymatically in duplicate. The VO2 max and percent body fat was 65.1 +/- 4.8 ml.kg-1.min-1 and 11.4 +/- 1.4, respectively. The venous lactate reached a peak concentration at the 6th minute (14.2 mmol.L-1) of an inactive recovery, and declined linearly thereafter to reach a concentration of 7.43 +/- 0.60 mmol.L-1 at the 30th minute. The net rate of lactate removal was .30 mmol.L-1.min-1. Statistical analysis found no significant difference in lactate concentration during the 4th, 5th and 6th minute post exercise, indicating that these post exercise times may be appropriate to sample venous blood for peak lactate concentration.

The Physiologic Effects of Multiple Simultaneous Electronic Control Device Discharges

“…Our results were similar to other authors studying single-device exposures 10. In a study by Gass et al,11 venous lactate increased to 14.2 mmol/L after a maximal exercise regimen on a treadmill in trained subjects. The changes in lactate in our study are small by comparison.…”

Pacing Strategy, Muscle Fatigue, and Technique in 1500-m Speed-Skating and Cycling Time Trials

“…A mean BLC-max of 14-16mmol•L -1 in all time-trials indicated that they were performed with maximal effort 27 and the decrease in MVC indeed confirmed the presence of muscle fatigue. The present paper also demonstrated that both peripheral and central mechanisms contributed to muscle fatigue in all time-trials.…”

Maximum oxygen uptake utilising different treadmill protocols.

“…Exercise heart rates were ascertained by cardiometer (Cardionics) and lung capacities by wedge spirometer (Vitalograph). Capillary blood samples (50 pl) were obtained by pin prick at 20 second intervals during continuous running, and at two and five minutes post-test, to ascertain lactate inflection point [4 mmol.F1 I (Mader et al, 1976) and post-exercise lactate levels (Gass et al, 1981). Samples were subsequently assayed in duplicate according to the methods of Guttman and Wahlefeld (1974).…”