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Ergogenic Effects of Very Low to Moderate Doses of Caffeine on Vertical Jump Performance
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- Teppei Matsumura
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Yuki Takamura
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Kazushi Fukuzawa
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Kazuya Nakagawa
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Shunya Nonoyama
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Keigo Tomoo
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Hayato Tsukamoto
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Yasushi Shinohara
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Motoyuki Iemitsu
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Akinori Nagano
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Tadao Isaka
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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- Takeshi Hashimoto
- Faculty of Sport and Health Science, Ritsumeikan University, Kusatsu, Shiga, Japan
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Description
<jats:p>Although the ergogenic effects of 3–6 mg/kg caffeine are widely accepted, the efficacy of low doses of caffeine has been discussed. However, it is unclear whether the ergogenic effects of caffeine on jump performance are dose responsive in a wide range of doses. This study aimed to examine the effect of very low (1 mg/kg) to moderate doses of caffeine, including commonly utilized ergogenic doses (i.e., 3 and 6 mg/kg), on vertical jump performance. A total of 32 well-trained collegiate sprinters and jumpers performed countermovement jumps and squat jumps three times each in a double-blind, counterbalanced, randomized, crossover design. Participants ingested a placebo or 1, 3, or 6 mg/kg caffeine 60 min before jumping. Compared with the placebo, 6 mg/kg caffeine significantly enhanced countermovement jump (<jats:italic>p</jats:italic> < .001) and squat jump (<jats:italic>p</jats:italic> = .012) heights; furthermore, 1 and 3 mg/kg of caffeine also significantly increased countermovement jump height (1 mg/kg: <jats:italic>p</jats:italic> = .002, 3 mg/kg: <jats:italic>p</jats:italic> < .001) but not squat jump height (1 mg/kg: <jats:italic>p</jats:italic> = .436, 3 mg/kg: <jats:italic>p</jats:italic> = .054). There were no significant differences among all caffeine doses in both jumps (all <jats:italic>p</jats:italic> > .05). In conclusion, even at a dose as low as 1 mg/kg, caffeine improved vertical jump performance in a dose-independent manner. This study provides new insight into the applicability and feasibility of 1 mg/kg caffeine as a safe and effective ergogenic strategy for jump performance.</jats:p>
Journal
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- International Journal of Sport Nutrition and Exercise Metabolism
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International Journal of Sport Nutrition and Exercise Metabolism 33 (5), 275-281, 2023-09-01
Human Kinetics
