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Randomized Controlled Trial
. 2023 Dec 12;13(1):22016.
doi: 10.1038/s41598-023-49453-y.

Acute enhancement of Romanian deadlift performance after consumption of caffeinated chewing gum

Chun-Hung Chen #  1   2   3 , Shih-Hao Wu #  1   2 , Yi-Jie Shiu  4   5 , Sheng-Yan Yu  4 , Chih-Hui Chiu  6
Affiliations
Randomized Controlled Trial

Acute enhancement of Romanian deadlift performance after consumption of caffeinated chewing gum

Chun-Hung Chen et al. Sci Rep. .

Erratum in

Abstract

This study investigates the effect of the consumption of caffeinated chewing gum on the performance of Romanian deadlift on the flywheel training device. A total of 19 participants completed a randomized, cross-over, single-blind experiment with food-grade caffeinated chewing gum trial (CAF) or placebo trail (PL). Gum were chewed for 10 min and rest for 15 min prior to the Romanian deadlift test using the inertial resistance training machine. 5 sets of 6 Romanian deadlifts were performed, with a 3-min rest between sets, followed by a 7-day washout period before the next set of trials. The average power, average force, total peak power, peak concentric power, peak eccentric power, heart rate, and rating of perceived exertion (RPE) for each trials were analyzed using paired-T test. Compared to placebo, caffeinated chewing gum trial enhanced peak concentric power (P = 0.016, Cohen's d = 0.44), peak eccentric power (P = 0.005, Cohen's d = 0.55), average power (P = 0.013, Cohen's d = 0.43), and total work (P = 0.026, Cohen's d = 0.28). However, in average force (P = 0.063, Cohen's d = 0.50), RPE (P = 0.266), and heart rate (P = 0.143), were no significant differences between trials. Caffeinated chewing gum with a dose of caffeine of 200 mg for 10 min may acutely enhance Romanian deadlift performance on the flywheel machine.

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Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
CONSORT diagram and study design.
Figure 2
Figure 2
Experimental protocol.
Figure 3
Figure 3
Peak concentric and eccentric power. The peak concentric power (A) and peak eccentric power (B) of the CAF and PL groups were compared. *CAF was significantly higher than those for the PL. The boxplot of each plot is displayed as (C, D).
Figure 4
Figure 4
The average power (A), average force (B), and total work (C) of the CAF and PL trials were compared. *CAF was significantly higher than those for the PL. The boxplot of each plot is displayed as (D–F).
Figure 5
Figure 5
Comparison of heart rate and rating of perceived exertion between the CAF and PL trials.
See this image and copyright information in PMC

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