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The purpose was to identify the most predictive parameters for perceived exertion and estimated time limit responses at the velocity corresponding to the lactate concentration threshold. The former scale concerns the subject's current status (how hard he feels the exercise currently is) whereas the latter scale deals with a subjective prediction of how long the current exercise level can be maintained. Multiple regression equations were developed among physiological, psychological, nutritional, and individual parameters (subjects' characteristics and performances) as independent variables, and perceived exertion or estimated time limit as dependent variables. Independent variables were collected before or during an incremental running field test. 94 regional to national level athletes (47 endurance-trained runners, 11 sprinters, and 36 handball players) participated. Multiple stepwise regression showed that Rating of Perceived Exertion and Estimated Time Limit at the lactate threshold were mainly mediated by factors relative to the performance expressed in percentage of the maximal aerobic velocity. Secondary factors which contribute significantly as perceptual predictors were related to various classes of factors except for psychological factors.

The purpose of this investigation was to study effects of acetaminophen consumption on ratings of perceived exertion and estimated time limit responses at the lactate threshold. 98 young regional to national level athletes performed a graded exhausting exercise on an outdoor running track to estimate their maximal aerobic velocity and the velocity associated with their lactate concentration threshold. Urine (30 mL) was collected during this test and analysed for numerous substances. During urinary screening for doping substances, 9 acetaminophen consumers (9.2%) among the 98 included athletes were detected. These acetaminophen consumers have significantly lower perceived exertion at velocity corresponding to the lactate concentration threshold than nonconsumers (11.9 [+ or -] 2.1 vs 13.6 [+ or -] 2.1, respectively) although they were at the same relative exercise intensity. This result shows that acetaminophen consumption may have mediated the perceived exertion response at the lactate concentration threshold. This may then suggest that the pain induced by training load could be a factor in use of self-prescribed pain relievers. Such consumption must be taken into account by medical staff, trainers, or educators who have to give information on the use and adverse effects of this substance and to propose palliative methods to their athletes.

The intersubject variability in times to exhaustion (tlim) at maximal aerobic speed (MAS) in a group that was homogeneous with regard to VO2max, was investigated. The data indicates that running time to exhaustion at MAS in subelite male runners was linked to time limit at 120% MAS. Anaerobic capacity was determined by the exercise to exhaustion at 120% MAS.

The time to exhaustion (t-lim) at the lowest velocity that elicits maximum oxygen uptake (vVO2 max) is inversely proportional to maximum oxygen consumption (VO2 max) for elite sportsmen. The VO2 max is different for various sports, except for cycling and running. The t-lim at vVO2 max is quite different between cycling and kayaking. The sportsmen employed for the comparative study included 9 cyclists, 9 kayak paddlers, 9 swimmers and 41 runners.