Retraction: Stein, J.A. et al. The Effects of Acute Caffeine Supplementation on Performance in Trained CrossFit Athletes. Sports 2019, 7, 95
Department of Kinesiology, College of Health and Human Sciences, Kansas State University, Manhattan, KS 66506, USA
*
Author to whom correspondence should be addressed.
Sports 2020, 8(2), 24; https://doi.org/10.3390/sports8020024
Received: 11 December 2019
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Accepted: 6 February 2020
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Published: 18 February 2020
All authors of the published article [1] have agreed to retract it based on the basis of a data entry error (Figure 1). After re-examination of our results for our published manuscript in Sports, we identified incorrectly entered data for six subjects on two variables. Specifically, the subjects who received caffeine during the first session and placebo during the second session (Session 1_Treatment = 2) were incorrectly recorded in the ‘Reps_Placebo’ and ‘Reps_Caffeine’ columns. Thus, the statistical results in our published manuscript were in inaccurate regarding caffeine’s effect during CrossFit exercise. Upon correction and re-analysis, we found that rather than a significant effect of caffeine, there was a significant effect of time (i.e., a learning effect). The paper [1] will therefore be retracted. We apologize to the readers of Sports for any inconvenience caused.
Reference
- Stein, J.A.; Ramirez, M.; Heinrich, K.M. The Effects of Acute Caffeine Supplementation on Performance in Trained CrossFit Athletes. Sports 2019, 7, 95. [Google Scholar] [CrossRef] [PubMed][Green Version]
Figure 1.
Database for [1]. Each row represents a subject in our investigation. Session 1_Treatment represents the treatment order (1 = placebo then caffeine, 2 = caffeine then placebo). Reps_Cindy.1 and Reps_Cindy.2 represent the total number of repetitions performed during session 1 and session 2, respectively. Reps_Placebo and Reps_Caffeine represent the total number of repetitions performed during the placebo and caffeine sessions, respectively.
Figure 1.
Database for [1]. Each row represents a subject in our investigation. Session 1_Treatment represents the treatment order (1 = placebo then caffeine, 2 = caffeine then placebo). Reps_Cindy.1 and Reps_Cindy.2 represent the total number of repetitions performed during session 1 and session 2, respectively. Reps_Placebo and Reps_Caffeine represent the total number of repetitions performed during the placebo and caffeine sessions, respectively.
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MDPI and ACS Style
Stein, J.A.; Ramirez, M.; Heinrich, K.M. Retraction: Stein, J.A. et al. The Effects of Acute Caffeine Supplementation on Performance in Trained CrossFit Athletes. Sports 2019, 7, 95. Sports 2020, 8, 24. https://doi.org/10.3390/sports8020024
AMA Style
Stein JA, Ramirez M, Heinrich KM. Retraction: Stein, J.A. et al. The Effects of Acute Caffeine Supplementation on Performance in Trained CrossFit Athletes. Sports 2019, 7, 95. Sports. 2020; 8(2):24. https://doi.org/10.3390/sports8020024
Chicago/Turabian StyleStein, Jesse A., Melitza Ramirez, and Katie M. Heinrich. 2020. "Retraction: Stein, J.A. et al. The Effects of Acute Caffeine Supplementation on Performance in Trained CrossFit Athletes. Sports 2019, 7, 95" Sports 8, no. 2: 24. https://doi.org/10.3390/sports8020024
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