Studies related to and

Caffeinated Chewing Gum Increases Repeated Sprint Performance And Augments Increases In Testosterone In Competitive Cyclists

Effect Increase
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 9
Gender Male
Age Range 18-29, 30-44
Body Types Trained, Average
Notes for this study:
The expected reduction in power throughout the trial was attenuated with caffeine ingestion; ended up being a 5.4% improvement on intermittent sprint performance relative to placebo.

Testosterone increased in the groups consuming 240mg of caffeinated gum by 12+/-14% more than placebo, although both groups had an exercise-dependent increase in testosterone. Oddly, cortisol was reduced in this study.

Caffeine And Sprinting Performance: Dose Responses And Efficacy

Effect None
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 17
Gender Male
Age Range 18-29
Body Types Trained, Average
Notes for this study:
Caffiene was dosed at 2,4,6,8 and 10mg/kg bodyweight in a double-blind manner 1 hour before sprinting exercises on an erg bike.

Caffine was unable to increase time to peak power, peak power output, or average power during sprints relative to placebo and noted a reduction in blood lactate levels.

Induced Alkalosis And Caffeine Supplementation: Effects On 2,000-m Rowing Performance

Effect Increase
Trial Design Double blind
Trial Length n/a
Number of Subjects 8
Gender n/a
Notes for this study:
Performance in elite rowers on a 2k was increased by approximately 2% with consumption of 6mg/kg caffeine.

Effects Of Caffeine On Prolonged Intermittent-sprint Ability In Team-sport Athletes

Effect Increase
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 10
Gender Male
Age Range 18-29
Body Types Trained, Average
Notes for this study:
The testing protocol was in trained athletes, with 4 second sprints separated by a 2 minute active recovery at 35% VO2 max. 18 of these sprints were conducted per half, and two halves were done with a break in between.

Caffeine group had greater peak power achieved during the sprints (7% in the first half, 6.6% in the second half) and did a greater total volume of work (8.5% in the first half, 7.6% in the second).

Influence Of Caffeine On Perception Of Effort, Metabolism And Exercise Performance Following A High-fat Meal

Effect None
Trial Design Double blind
Trial Length n/a
Number of Subjects 10
Gender n/a
Notes for this study:
Caffeine consumed with a high-fat meal prior to two exercise tests was not able to increase performance, although it still exerted the reduction of perceived effort.

Effects Of Caffeine On Repeated Sprint Ability, Reactive Agility Time, Sleep And Next Day Performance

Effect Increase
Trial Design Double blind
Trial Length n/a
Number of Subjects 10
Gender n/a
Notes for this study:
6mg/kg caffeine ingested 1 hour before exercise was able to increase intermittent sprint performance (best time and overall volume) but had no significant effect on reaction time.

Ergogenic Effect Of Varied Doses Of Coffee-caffeine On Maximal Aerobic Power Of Young African Subjects

Effect None
Trial Design Double blind
Trial Length n/a
Number of Subjects 20
Gender n/a
Notes for this study:
20 young adult Nigerian men were recruited and tested for their VO2 max and performance in a 20 meter shuttle run test. They were tested one hour after ingestion of either 5, 10, or 15mg/kg coffee (ended up being 299.5mg, 599mg, and 898.5mg respectively), and no statistically significant benefits were seen.