Author(s): MEIXNER, B., KOEHLER, K., NUSSER, V., SPERLICH, B. , Institution: FRIEDRICH-ALEXANDER-UNIVERSITÄT ERLANGEN-NÜRNBERG, Country: GERMANY, Abstract-ID: 2160

INTRODUCTION:
vLamax-testing has recently become a much-utilized testing procedure. Mader’s model of energy metabolism is the basis for the testing procedure and explains the implications of the so-called maximal glycolytic rate for short and long duration efforts [1, 2] . The testing procedure is mainly used by endurance athletes such as cyclists and triathletes. The vLamax test procedure traditionally consists of a 15-s all-out cycling test and lactate measurements before the sprint and until the ninth minute after the sprint has ended to determine maximal lactate accumulation. The calculation of vLamax is based on the equation of Heck & Schulz [3]. The aim of this study was to determine the relation between power output during and capillary blood lactate accumulation after the sprint cycling test.
METHODS:
30 male and 20 female amateur cyclists completed three trials of 15-s all-out cycle sprint tests: one familiarization trial and two trials used for this analysis. Body composition was determined during the first visit via bioelectrical impedance analysis (inbody 720, Biospace). After a 10 min warm-up at 1.5 W/kg, participants then rested for 3 min before completing an isokinetic all-out sprint at 130 RPM on a Cyclus2-ergometer (RBM elektronik-automation), which had the participants own bike installed. Capillary blood lactate was measured at the earlobe before and for 9 min after the test using BioSen C-Line (EKF Diagnostics).
RESULTS:
Mean power output during the 15-s all-out sprint can be predicted by simple linear regression by fat-free mass (R2= 0.79) and by calculated total lactate production (∆La * 0.7*fat-free mass)(R2=0.78). A multiple linear regression model combining both predictors improves the model (R2=0.92) for each of the two trials.
CONCLUSION:
Lactate production in a 15-s all-out sprint is intricately linked to body composition and power output. It remains uncertain if maximal glycolytic rate limits power production during the 15-s all-out sprint test. However, lactate production is clearly linked to mean power output. It is possible to provide calculated lactate values or vLamax if body composition and power outputs in a 15-s all-out sprint is known.

References:
1. Mader, A. and H. Heck, A Theory of the Metabolic Origin of "Anaerobic Threshold". Int. J. Sports Med., 1986.
2. Mader, A., Glycolysis and oxidative phosphorylation as a function of cytosolic phosphorylation state and power output of the muscle cell. Eur J Appl Physiol, 2003.
3. Heck, H. and H. Schulz, Methoden der anaeroben Leistungsdiagnostik. Deutsche Zeitschrift Für Sportmedizin, 2002.