Award Date


Degree Type


Degree Name

Master of Science (MS)



First Committee Member

John C. Young

Number of Pages



Caffeine has been proported to increase endurance exercise time to exhaustion. However, the effects of caffeine on high-intensity, intermittent exercise to exhaustion have not been widely studied. Therefore, the purpose of this study was to examine the effect of caffeine on intermittent, high intensity exercise to exhaustion in individuals with minimal daily dietary caffeine consumption. Seven male participants, age 26 {dollar}\pm{dollar} 2 years, body mass 77 {dollar}\pm{dollar} 11 kg, and VO2{dollar}\rm\sb{max}{dollar} 47 {dollar}\pm{dollar} 7 ml/kg/min, performed a high-intensity exercise bout under both caffeine and placebo conditions administered in a counterbalanced, double blind fashion. Participants cycled at 120% of peak power output for 60 seconds followed by 120 seconds of recovery at 50 Watts. Work/rest cycles continued until voluntary exhaustion. Blood samples were taken immediately prior to administering caffeine or placebo beverages, one hour post absorption, and immediately following the conclusion of the exercise test. No significant difference in time to exhaustion was found between caffeine and placebo trials (12.5 {dollar}\pm{dollar} 5.9 vs 12.3 {dollar}\pm{dollar} 6.6 min), nor did peak blood lactate concentration differ between trials (11.3 {dollar}\pm{dollar} 1.0 vs 11.6 {dollar}\pm{dollar} 1.9 mM). These results suggest that caffeine treatment provides no significant improvement in performance time during intermittent, high-intensity exercise to exhaustion.


Caffeine; Effect; Exercise; Exhaustion; High; Intensity; Intermittent

Controlled Subject

Kinesiology; Physiology; Pharmacology

File Format


File Size

1853.44 KB

Degree Grantor

University of Nevada, Las Vegas




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