The action of caffeine on the capacity for muscular work

Rivers, W. H. R.; Webber, H. N.

doi:10.1113/jphysiol.1907.sp001215

Cited by 71 publications

(39 citation statements)

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“…T he ergogenic properties of caffeine have been identified since the early 1900s (29). Early data (8,20) revealed an ergogenic effect of caffeine on endurance performance.…”

Section: Introductionmentioning

confidence: 99%

Minimal Effect of Acute Caffeine Ingestion on Intense Resistance Training Performance

Astorino

Martin

Schachtsiek

et al. 2011

Journal of Strength and Conditioning Research

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The primary aim of the study was to determine the efficacy of acute caffeine intake to enhance intense resistance training performance. Fourteen resistance-trained men (age and body mass = 23.1 ± 1.1 years and 83.4 ± 13.2 kg, respectively) who regularly consumed caffeine ingested caffeine (6 mg · kg(-1)) or placebo 1 hour before completion of 4 sets of barbell bench press, leg press, bilateral row, and barbell shoulder press to fatigue at 70-80% 1-repetition maximum. Two minutes of rest was allotted between sets. Saliva samples were obtained to assess caffeine concentration. The number of repetitions completed per set and total weight lifted were recorded as indices of performance. Two-way analysis of variance with repeated measures was used to examine differences in performance across treatment and sets. Compared to placebo, there was a small but significant effect (p < 0.05) of acute caffeine intake on repetitions completed for the leg press but not for upper-body exercise (p > 0.05). Total weight lifted across sets was similar (p > 0.05) with caffeine (22,409.5 ± 3,773.2 kg) vs. placebo (21,185.7 ± 4,655.4 kg), yet there were 9 'responders' to caffeine, represented by a meaningful increase in total weight lifted with caffeine vs. placebo. Any ergogenic effect of caffeine on performance of fatiguing, total-body resistance training appears to be of limited practical significance. Additional research is merited to elucidate interindividual differences in caffeine-mediated improvements in performance.

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“…T he ergogenic properties of caffeine have been identified since the early 1900s (29). Early data (8,20) revealed an ergogenic effect of caffeine on endurance performance.…”

Section: Introductionmentioning

confidence: 99%

Minimal Effect of Acute Caffeine Ingestion on Intense Resistance Training Performance

Astorino

Martin

Schachtsiek

et al. 2011

Journal of Strength and Conditioning Research

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“…Simple beliefs and expectations can trigger spontaneous self-healing in patients. Indeed, this effect is so strong that clinical trials should be conducted as double-blind experiments (Rivers and Webber 1907). It does not suffice to keep the patients ignorant about which pill is the actual medicine and which one is simply a sugar tablet.…”

Section: The Mind-body Problemmentioning

confidence: 99%

Subjective Consciousness: What am I?

Glattfelder¹

2019

The Frontiers Collection

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Consciousness is a fact. In this very moment your eyes are scanning these words and your mind is creating understanding of and context for the contents utilizing memory. However, astonishingly, we don't know how to accommodate consciousness into our scientific view of the world. Until quite recently, the nation of consciousness was taboo for scientists and philosophers alike. Today, a central problem is: How does the feeling of subjective experience emerge from neural activity? As a corollary: How does the ethereal mind interact with the physical world? Insights from neuroscience have uncovered that our perceptions of reality are not faithful representations, but constructed virtual reality simulations. Memories are also constructed and not retrieved. The sense of self is a result of a complex cognitive effort. The role of our consciousness is to narrate and rationalize the decisions emerging from the subconscious brain, in retrospect. Context and expectations influence and shape perceptions and experiences. The human mind exhibits countless irrational behaviors-cognitive biases abound. The mind can also suffer from a wide array of pathologies. Finally, free will is a very controversial topic, as experiments question its reality. Level of mathematical formality: not applicable. The phenomenon of consciousness represents the last enigma. After the long journey of the human mind-attempting to decode the workings of the universe-it has returned and is now facing its own existence. Just as the understanding of the fundamental nature of reality turned out to be an elusive quest, the challenge of understanding one's own mind appears truly stupendous. The psychologist Susan Blackmore summarizes (Blackmore 2005, p. 1): What is consciousness? This may sound like a simple question but it is not. Consciousness is at once the most obvious and the most difficult thing we can investigate. We seem either to have to use consciousness to investigate itself, which is a slightly weird idea, or have to extricate ourselves from the very thing we want to study.

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“…For more than one hundred years, caffeine has been known to have an ergogenic effect on muscular work. 1 In particular, the efficacy of caffeine has been well-documented in dynamic exercise in which aerobic metabolism predominates. 2 A recent study showed that 74% of competitive athletes use caffeine due to its ergogenic capabilities.…”

Section: Introductionmentioning

confidence: 99%

Muscle Strength and Caffeine Supplementation: Are We Doing More of the Same?

Soares

Garcia

Molina

et al. 2019

Rev Bras Med Esporte

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The purpose of this review was to examine in the current literature the advances made in terms of the effects of caffeine supplementation on maximum strength and its associated mechanisms since the publication of two important papers in 2010. Searches were carried out in the PubMed, Medline, Scielo and Web of Science databases for articles published after 2010. Sixteen studies were included based on inclusion and exclusion criteria. Five studies did not report changes in maximal voluntary strength (31.3%). Four of them used isometric muscle contractions, although this may not be a key factor because five other studies also used isometric contractions and reported ergogenic effects. Furthermore, these four studies evaluated small muscle groups and volunteers were not accustomed to consuming caffeine. Caffeine produced ergogenic effects in eleven of the sixteen studies analyzed (68.8%). None of the doses were clearly related to ergogenic effects; however, a dose of at least 3 mg/kg of caffeine is probably necessary. Caffeine ergogenicity was affected by various factors. There was a lack of standardized protocols and controls for intervening factors (e.g., circadian cycles and nutritional states), which could affect results. An ideal caffeine supplementation protocol that is useful for future research, athletes, and physical activity practitioners, has yet to be defined. A small advance made since 2010 involved a possible lack of gender difference; it would appear that caffeine supplementation affects men and women equally. Level of Evidence I; Systematic Review of Level I Studies.

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The action of caffeine on the capacity for muscular work

Cited by 71 publications

References 0 publications

Minimal Effect of Acute Caffeine Ingestion on Intense Resistance Training Performance

Minimal Effect of Acute Caffeine Ingestion on Intense Resistance Training Performance

Subjective Consciousness: What am I?

Muscle Strength and Caffeine Supplementation: Are We Doing More of the Same?

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