Calculation of times to exhaustion at 100 and 120% maximal aerobic speed

Abstract

The aim was to compare physiologic responses during exhaustive runs performed on a treadmill at 100. and 120% maximal aerobic speed (MAS: the minimum speed that elicits VO_2max). Fourteen subelite male runners (mean±SD; age=27±5 years; VO_2max=68.9±4.6 ml.kg^{- 1}.min^{- 1}; MAS=21.5±1km.h^-1) participated. Mean time to exhaustion (t _lim100%) at 100% MAS (269±77s) was similar to those reported in other studies. However, there was large variability in individual t _lim100% MAS (CV=29%). MAS was positively. lim100% correlated with VO (r=0.66, p<0.05) but not with t _lim MAS (r=-0.50, p<0.05). t _lim MAS was correlated with t at 120% MAS(r=0.52, p<0.05) and to blood pH following the rest at 120% MAS (r=-0.68, p<0.05). The data suggest that running time to exhaustion at MAS in subelite male runners is related to time limit at 120% (t _lim) MAS. Moreover, anaerobic capacity determined by the exercise to exhaustion at 120% MAS can be defined as the variable ‘a’ in the model of Monod and Scherrer (1954).

Keywords:

• Lactate
• Blood Ph
• Running
• Exercise
• Time To Exhaustion
• Maximal
• Aerobic Speed