Placebo Effect of Caffeine on Maximal Strength and Strength Endurance in Healthy Recreationally Trained Women Habituated to Caffeine
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Design
2.2. Study Participants
2.3. Familiarization Session and One-Repetition Maximum Test
2.4. Experimental Protocol
2.5. Statistical Analysis
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Age (years) | 23.0 ± 0.8 |
Body mass (kg) | 62.5 ± 6.9 |
Height (cm) | 167.5 ± 5.1 |
Resistance training experience (years) | 3.0 ± 0.8 |
1 RM in bench press exercise (kg) | 40.0 ± 9.7 |
Habitual caffeine intake (mg/b.m; mg/day) | 4.1 ± 1.6; 248.8 ± 91.5 |
Energy intake (kcal) | 2332.8 ± 255.1 |
Protein (% of total energy intake) | 22.5 ± 2.8 |
Carbohydrates (% of total energy intake) | 27.3 ± 3.7 |
Fat (% of total energy intake) | 50.2 ± 4.8 |
Variable | CONT (95% CI) | PLAC (95% CI) | p | d | Relative Effect (%) |
---|---|---|---|---|---|
1RM (kg) | 40.0 ± 10.5 (33.7 to 46.3) | 41.0 ± 9.5 (35.2 to 46.7) | 0.10 | 0.10 | 3.1 ± 4.9 |
SET repetitions (n) | 32.2 ± 5.1 (29.2 to 35.3) | 31.8 ± 4.5 (29.1 to 34.5) | 0.66 | 0.08 | −0.6 ± 11.5 |
SET time under tension (s) | 48.2 ± 6.3 (44.4 to 52.1) | 49.2 ± 7.4 (44.7 to 53.6) | 0.67 | 0.15 | 2.8 ± 17.1 |
SET mean power output (W) | 130 ± 34 (110 to 151) | 121 ± 26 (106 to 137) | 0.08 | 0.30 | −5.4 ± 11.2 |
SET peak power output (W) | 293 ± 82 (244 to 343) | 268 ± 48 (239 to 297) | 0.12 | 0.37 | −5.5 ± 15.4 |
SET mean velocity (m/s) | 0.62 ± 0.09 (0.56 to 0.67) | 0.60 ± 0.10 (0.54 to 0.65) | 0.43 | 0.21 | −2.3 ± 14.8 |
SET peak velocity (m/s) | 1.17 ± 0.10 (1.11 to 1.23) | 1.11 ± 0.10 (1.06 to 1.17) | 0.07 | 0.60 | −4.5 ± 8.3 |
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Filip-Stachnik, A.; Krzysztofik, M.; Kaszuba, M.; Leońska-Duniec, A.; Czarny, W.; Del Coso, J.; Wilk, M. Placebo Effect of Caffeine on Maximal Strength and Strength Endurance in Healthy Recreationally Trained Women Habituated to Caffeine. Nutrients 2020, 12, 3813. https://doi.org/10.3390/nu12123813
Filip-Stachnik A, Krzysztofik M, Kaszuba M, Leońska-Duniec A, Czarny W, Del Coso J, Wilk M. Placebo Effect of Caffeine on Maximal Strength and Strength Endurance in Healthy Recreationally Trained Women Habituated to Caffeine. Nutrients. 2020; 12(12):3813. https://doi.org/10.3390/nu12123813
Chicago/Turabian StyleFilip-Stachnik, Aleksandra, Michal Krzysztofik, Magdalena Kaszuba, Agata Leońska-Duniec, Wojciech Czarny, Juan Del Coso, and Michal Wilk. 2020. "Placebo Effect of Caffeine on Maximal Strength and Strength Endurance in Healthy Recreationally Trained Women Habituated to Caffeine" Nutrients 12, no. 12: 3813. https://doi.org/10.3390/nu12123813