[40] study is the fact that caffeine continued to enhance performance in terms of repeated

acquisition (assessment of motor learning and short-term memory) and Profile of Mood States fatigue eight hours following consumption. These results are in agreement with Bell et al. [41], where aerobic capacity was assessed 1, 3, and 6 hours following caffeine consumption (6 mg/kg). Caffeine had a positive effect on EGFR inhibitor performance for participants this website classified as users(≥ 300 mg/d) and nonusers (≤ 50 mg/d); however, nonusers had a treatment effect at 6 hours post-consumption, which was not the case for users – this group only had a significant increase in performance at 1 and 3 hours post- consumption. Taken together, INK 128 price results of these studies [40, 41] provide some indication, as well as application for the general consumer and athlete. Specifically, while caffeine is said to have a half-life of 2.5-10 hours [42], it is possible performance-enhancing effects may extend beyond that time point as individual response

and habituation among consumers varies greatly. Finally, it was suggested by Lieberman and colleagues [40] that the performance-enhancing effects of caffeine supplementation on motor learning and short-term memory may be related to an increased ability to sustain concentration, as opposed to an actual effect on working memory. Lieberman et al. [40] attributed the effects of caffeine to

actions on the central nervous system, specifically the supplement’s ability to modulate inhibitory actions, especially those of adenosine. In fact, it was suggested that because caffeine has the ability to act as an antagonist to adenosine, alterations in arousal would explain the compound’s discriminatory effect on behaviors relating vigilance, fatigue and alertness [40]. Recently, it was also suggested that caffeine can positively affect both cognitive and endurance performance [25]. Trained cyclists, who were moderate caffeine consumers (approximated at 170 mg/d) participated in three experimental trials consisting of 150 min of cycling at 60% VO2max followed by five minutes of rest and then a ride to exhaustion at 75% VO2max. On three separate days, subjects consumed a commercially available performance bar that contained either 44.9 g of carbohydrates from and 100 mg of caffeine, non-caffeinated-carbohydrate and isocaloric, or flavored water. Results from a repeated series of cognitive function tests favored the caffeine treatment in that subjects performed significantly faster during both the Stroop and Rapid Visual Information Processing Task following 140 min of submaximal cycling as well as after a ride to exhaustion. In addition, participant time increased for the ride to exhaustion on the caffeine treatment, as compared to both the non-caffeinated bar and flavored water [25].