Studies related to Heart Rate and Caffeine

Effect Of Caffeine On LT, VT And HRVT

Effect None
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 10
Gender Both Genders
Age Range 18-29, 30-44
Body Types Untrained, Average
Notes for this study:
An increase in VO2 was noted at rest, but not during exercise, with 5mg/kg of an acute dose of caffeine with similar trends on blood lactate (increase at rest, none during exercise) with no detectable influence on heart rate at ventilatory threshold, rest, or max heart rate.

The Effects Of Different Doses Of Caffeine On Endurance Cycling Time Trial Performance

Effect Increase
Trial Design Double blind
Trial Length n/a
Number of Subjects 16
Gender n/a
Notes for this study:
16 well-trained cyclists performed at 75% VO2 max for 60 minutes at either 3 or 6mg/kg bodyweight caffeine in order to assess which dose was better. Improvements on distance gone for the 60 minutes were improvement in both groups, 4.2% improvement at 3mg/kg bodyweight and 2.9% improvement at 6mg/kg bdoyweight. The difference was not statistically significant, and they were seen as equally effective.

Heart rate was increased relative to placebo during exercise.

Dose Response Effects Of A Caffeine-containing Energy Drink On Muscle Performance: A Repeated Measures Design

Effect Increase
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 12
Gender Both Genders
Age Range 18-29, 30-44
Body Types Trained, Average
Notes for this study:
In 12 active and healthy participants (light caffeine consumers at less than 60mg daily), an intake of a caffeinated energy drink (compared to placebo, the same energy drink but not caffeinated) was able to increased blood pressure and heart rate at rest without significantl affecting metabolic rate up to 3mg/kg bodyweight.

Power output, as measured by half-squat and bench, was increased only at 3mg/kg bodyweight with no significant influence at 1mg/kg.

Effects Of 1,3-dimethylamylamine And Caffeine Alone Or In Combination On Heart Rate And Blood Pressure In Healthy Men And Women

Effect None
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 10
Gender Both Genders
Age Range 18-29
Body Types Average
Notes for this study:
Caffeine, at 250mg, was able to increase blood pressure in a sample of otherwise healthy young persons. The increase was smaller in magnitude than the combination of caffeine and 1,3-DMAA, which was a notable increase in blood pressure.

Caffeine Supplementation And Multiple Sprint Running Performance

Effect Increase
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 21
Gender Male
Age Range 18-29
Body Types Trained, Average
Notes for this study:
21 trained men were subject to an intermittent sprint protocol of 12 separate 30m sprints separated by 35 seconds, and one group ingested 5mg/kg bodyweight caffeine 1 hour before the test.

Maximum speed increased in the caffeine group, being 1.4% quicker than placebo, and heart rate was elevated on average 3.4BPM greater than placebo subject to the same training.

The Effect Of Caffeine Ingestion On Mood State And Bench Press Performance To Failure

Effect Increase
Trial Design Double blind
Trial Length 24 hours
Number of Subjects 13
Gender Male
Age Range 18-29
Body Types Trained, Average
Notes for this study:
In moderately trained men given 5mg/kg bodyweight caffeine, caffeine supplementation was associated with an increased performance in the bench press via increased reps at 60% max weight and more overall volume per set. Blood lactate and heart rate were also significantly greater in caffeine than placebo. The mood states were changed for vigor (increase) and fatigue (decrease) with caffeine.