Response to “Are There Non-Responders to the Ergogenic 3 Effects of Caffeine Ingestion on Exercise Performance?”

Southward, Kyle; Rutherfurd-Markwick, Kay; Badenhorst, Claire E.; Ali, Ajmol

doi:10.3390/nu10111752

Cited by 2 publications

(2 citation statements)

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“…Both emphasized a current clinical interest limited to CYP1A2 and ADORA2A variations, suggesting opportunities to expand this research to more recent loci identified by GWAS. Despite the advancements in integrating genetics into clinical trials of caffeine, such designs remain susceptible to limitations [ 9 , 10 , 12 , 13 ]. Some of these limitations were further highlighted by Shabir et al [ 14 ] in their critical review on the impact of caffeine expectancies on sport, exercise, and cognitive performance.…”

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confidence: 99%

The Impact of Caffeine and Coffee on Human Health

Cornelis

2019

Nutrients

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confidence: 99%

The Impact of Caffeine and Coffee on Human Health

Cornelis

2019

Nutrients

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“…Understanding these expectations is critical to assess the risk of bias in clinical trials in sports science due to the ergogenic or ergolytic effects of placebo associated with the effects of caffeine. Literature shows how the placebo effect ( 33 , 34 ), either due to excess or lack of expectation about the effect of caffeine ( 12 , 14 , 35 , 36 ), can represent a possible risk of bias for the main findings of the research. For example, scores above the national average for factors may indicate a tendency to respond to caffeine supplementation.…”

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confidence: 99%

Brief Version of Caffeine Expectancy Questionnaire in Brazil

et al. 2021

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The use of extensive questionnaires has the limitation of filling time bias, related to the ability to focus and accurately respond to many items, justifying the necessity for a brief version. This study aimed to build a brief version of the Caffeine Expectancy Questionnaire in Brazil (B-CaffEQ-BR) composed of 21 items divided into seven factors, with as adequate consistency and reproducibility as the full version. Quantitative procedures using statistical modeling were applied using the CaffEQ-BR (full version) database keeping the Mean Absolute Error (MAE) (based on the full version) <0.5 and Cronbach's α and Intraclass Correlation Coefficient (ICC) ≥0.7. The expert panel (n = 3), in a blind design, evaluated the semantic structuring within the options indicated by previous statistical modeling until the agreement of the expert panel. The participants (n = 62), Brazilian adults who were regular caffeine consumers (175.8 ± 94.4 mg/day), of whom 62.9% were women, 33.1 ± 9.7 years, 24.5 ± 3.8 kg/m2, and 62.9% of whom self-identified as white, were asked to respond twice to the online questionnaire in 48–72 h. The first sample (n = 40) tested interobserver reproducibility with the double application of B-CaffEQ-BR. Another sample (n = 22) answered the CaffEQ-BR (full version) and B-CaffEQ-BR, and the last sample (n = 18) performed the reverse process. The B-CaffEQ-BR presented excellent internal consistency (Cronbach's α ≥ 0.729) and overall reproducibility (ICC ≥ 0.915) for the entire questionnaire and its seven factors. The B-CaffEQ-BR can be a valuable tool in caffeine research with the Brazilian adult population.

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Response to “Are There Non-Responders to the Ergogenic 3 Effects of Caffeine Ingestion on Exercise Performance?”

Abstract: In response to “Letter: are there non-responders to the ergogenic effects of caffeine ingestion on exercise performance” by Grgic [...]

Cited by 2 publications

References 6 publications

The Impact of Caffeine and Coffee on Human Health

The Impact of Caffeine and Coffee on Human Health

Brief Version of Caffeine Expectancy Questionnaire in Brazil

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