Caffeine Studies

[transXisomer]

The Effect of Ephedra and Caffeine on Maximal Strength and Power in Resistance-Trained Athletes.

Journal of Strength & Conditioning Research. 22(2):464-470, March 2008.
Andrew D Williams; Paul J Cribb; Matthew B Cooke; Alan Hayes

Abstract:
Caffeine and ephedrine-related alkaloids recently have been removed from International Olympic Committee banned substances lists, whereas ephedrine itself is now permissible at urinary concentrations less than 10 µg·mL-1. The changes to the list may contribute to an increased use of caffeine and ephedra as ergogenic aids by athletes. Consequently, we sought to investigate the effects of ingesting caffeine (C) or a combination of ephedra and caffeine (C + E) on muscular strength and anaerobic power using a double-blind, crossover design. Forty-five minutes after ingesting a glucose placebo (P: 300 mg), C (300 mg) or C + E (300 mg + 60 mg), 9 resistance-trained male participants were tested for maximal strength by bench press [BP; 1 repetition maximum (1RM)] and latissimus dorsi pull down (LP; 1RM). Subjects also performed repeated repetitions at 80% of 1RM on both BP and LP until exhaustion. After this test, subjects underwent a 30-second Wingate test to determine peak anaerobic cycling power, mean power, and fatigue index. Although subjects reported increased alertness and enhanced mood after supplementation with caffeine and ephedra, there were no significant differences between any of the treatments in muscle strength, muscle endurance, or peak anaerobic power. The results of this study do not support the contention that supplementation with ephedra or caffeine will enhance either muscle strength or anaerobic exercise performance.(5/7/2008)

[Newlife4me]

Nice post Trans, any chance of linkage to that whole thing? Or was that all that there was?

[Right Hook]

I could find studies to refute that...

But when used correctly I like caffeine as a stim.

[transXisomer]

Im a member of the NSCA so they email me these study articles, heres the link:

NSCA News

[transXisomer]

J Strength Cond Res. 2006 Nov;20(4):751-5.

Effects of eight weeks of caffeine supplementation and endurance training on aerobic fitness and body composition.

Malek MH, Housh TJ, Coburn JW, Beck TW, Schmidt RJ, Housh DJ, Johnson GO.
University of Nebraska-Lincoln Human Performance Laboratory, Department of Nutrition and Health Sciences, Lincoln, NE 68583, USA. mmalek@unlserve.unl.edu

The purpose of this study was to examine the effects of daily administration of a supplement that contained caffeine in conjunction with 8 weeks of aerobic training on VO(2)peak, time to running exhaustion at 90% VO(2)peak, body weight, and body composition. Thirty-six college students (14 men and 22 women; mean +/- SD, age 22.4 +/- 2.9 years) volunteered for this investigation and were randomized into either a placebo (n = 18 ) or supplement group (n = 18 ). The subjects ingested 1 dose (3 pills = 201 mg of caffeine) of the placebo or supplement per day during the study period. In addition, the subjects performed treadmill running for 45 minutes at 75% of the heart rate at VO(2)peak, three times per week for 8 weeks. All subjects were tested pretraining and posttraining for VO(2)peak, time to running exhaustion (TRE) at 90% VO(2)peak, body weight (BW), percentage body fat (%FAT), fat weight (FW), and fat-free weight (FFW). The results indicated that there were equivalent training-induced increases (p < 0.05) in VO(2)peak and TRE for the supplement and placebo groups, but no changes (p > 0.05) in BW, %FAT, FW, or FFW for either group. These findings indicated that chronic use of the caffeine-containing supplement in the present study, in conjunction with aerobic training, provided no ergogenic effects as measured by VO(2)peak and TRE, and the supplement was of no benefit for altering body weight or body composition.
PMID: 17149989 [PubMed - indexed for MEDLINE]

[Right Hook]

Lots of positive studies listed on the following link. However they are biased...

Applied Nutriceuticals - Better Results Through Science

[LBVT]

For every study that proves something, there is another study out there that disproves the results of the first study.

[xjsynx]

Caffeine and other stims are my friend...

[transXisomer]

And we have another one, just done this month:

The Acute Effects of a Caffeine-Containing Supplement on Bench Press Strength and Time to Running Exhaustion.
Journal of Strength & Conditioning Research. 22(5):1654-1658, September 2008.
Travis W Beck; Terry J Housh; Moh H Malek; Michelle Mielke; Russell Hendrix

Abstract:
Beck, TW, Housh, TJ, Malek, MH, Mielke, M, and Hendrix, R. The acute effects of a caffeine-containing supplement on bench press strength and time to running exhaustion. J Strength Cond Res 22(5): 1654-1658, 2008-The purpose of the present study was to examine the acute effects of a caffeine-containing supplement (SUPP) on one-repetition maximum (1-RM) bench press strength and time to running exhaustion (TRE) at a velocity that corresponded to 85% of the peak oxygen uptake ([latin capital V with dot above]O2peak). The study used a double-blinded, placebo-controlled, crossover design. Thirty-one men (mean +/- SD age = 23.0 +/- 2.6 years) were randomly assigned to take either the SUPP or placebo (PLAC) first. The SUPP contained 201 mg of caffeine, and the PLAC was microcrystalline cellulose. All subjects were tested for 1-RM bench press strength and TRE at 45 minutes after taking either the SUPP or PLAC. After 1 week of rest, the subjects returned to the laboratory and ingested the opposite substance (SUPP or PLAC) from what was taken during the previous visit. The 1-RM bench press and TRE tests were then performed in the same manner as before. The results indicated that the SUPP had no effect on 1-RM bench press strength or TRE at 85% [latin capital V with dot above]O2peak. It is possible that the acute effects of caffeine are affected by differences in training status and/or the relative intensity of the exercise task. Future studies should examine these issues, in addition to testing the acute effects of various caffeine doses on performance during maximal strength, power, and aerobic activities. These findings do not, however, support the use of caffeine as an ergogenic aid in untrained to moderately trained individuals.

©2008 National Strength and Conditioning Association

[transXisomer]

And another one...

Originally Posted by Article

Findings conclude sustained caffeine intake negates the benefits of creatine supplements

New study on the effects of combining caffeine and creatine

Results

Key findings of this study included:

· a confirmation of the fact that oral creatine supplementation shortens muscle relaxation time in humans: relation time was reduced by five percent and was significantly shorter than after the placebo;

· discovery that the intake of caffeine, combined with a daily creatine supplement, counteracted the beneficial effects of creatine intake on relaxation time and fatigue enhanced this inhibitory effect; and

· the observation that caffeine reduces the functional capacity of sacroplasmic reticulum calcium ATPase.

Conclusion The researchers believe that the findings from this experiment offer indirect evidence that suggests that facilitation of muscle relaxation may be important to the ergogenic action of creatine supplementation as well as power production during sprint exercises.

Findings conclude sustained caffeine intake negates the benefits of creatine supplements