Effect of caffeine as an ergogenic aid during anaerobic exercise performance in caffeine naive collegiate football players

Kathleen Woolf, Wendy K. Bidwell, Amanda G. Carlson

Research output: Contribution to journalArticlepeer-review


Research suggests that caffeine may improve performance in aerobic exercise; the evidence for anaerobic performance is mixed. This study examined the effect of caffeine (5 mg/kg body weight [BW]) vs. placebo on performance-based anaerobic exercise tests used during the National Football League (NFL) Combine. Collegiate football athletes (n = 17; 20 ± 2 yr; body mass index 29.4 ± 3.6 kg/m2) completed 2 study visits, 1 week apart. Participants were low caffeine users with a reported average intake of 16 ± 20 mg/day. On the day of testing, participants ingested a caffeinated (5 mg/ kg BW caffeine + 0.125 g/kg BW carbohydrate) or placebo (0.125 g/kg BW carbohydrate) beverage, ate a light meal, and completed 3 exercise tests (40-yard dash, 20-yard shuttle, and a bench press) 60 minutes later. Borg's rating of perceived exertion (RPE) was recorded after each exercise test. Heart rate (HR) and blood pressure (BP) were monitored (pre-exercise and postexercise). Data were analyzed using paired t-tests, Wilcoxon signed rank test, and repeated measures analysis of variance. No significant differences were found between treatments for the exercise tests (40-yard dash: 5.01 ± 0.25 vs. 5.03 ± 0.26 s, p = 0.43; 20-yard shuttle: 4.64 ± 0.19 vs. 4.66 ± 0.24 s, p = 0.51; bench press: 17 ± 8 vs. 17 ± 8 reps, p =0.51; caffeine vs. placebo, respectively). However, 59% of the participants improved in performance with the caffeine during the bench press and the 40-yard dash. No differences were found between treatments for RPE, HR, and BP. Caffeine did not improve performance for anaerobic exercise tests used at the NFL Combine in caffeine naive male football athletes.

Original languageEnglish (US)
Pages (from-to)1363-1369
Number of pages7
JournalJournal of Strength and Conditioning Research
Issue number5
StatePublished - Aug 2009


  • 20-yard shuttle
  • 40-yard dash
  • Bench press
  • Field tests

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation


Dive into the research topics of 'Effect of caffeine as an ergogenic aid during anaerobic exercise performance in caffeine naive collegiate football players'. Together they form a unique fingerprint.

Cite this