Caffeine Mouth Rinse Plus Ingestion Improves the 10-Km Time Trial Compared to Caffeine Mouth Rinse Alone

• Published in: Research quarterly for exercise and sport Vol. 95; no. 3; pp. 617 - 624
• Main Authors: Marinho, Alisson Henrique, da Silva, Jean Marcos, Brandão, Vitor Fon do Nascimento, Jatobá, Sarah Gomes, Júnior, Pedro Balikian, Ataide-Silva, Thays, Sousa, Filipe Antônio de Barros, Bastos-Silva, Victor José, de Araujo, Gustavo Gomes
• Format: Journal Article
• Language: English
• Published: United States Routledge 02.07.2024
• Subjects: Adult; Athletic Performance - physiology; Bicycling - physiology; Caffeine - administration & dosage; Cellulose - administration & dosage; Endurance; exercise; Heart Rate - drug effects; Humans; Magnesium Sulfate - administration & dosage; Male; Mouthwashes - administration & dosage; nutrition; Physical Exertion - physiology; trimethylxanthine; Young Adult; exercise; nutrition; Endurance; trimethylxanthine
• ISSN: 0270-1367; 2168-3824; 2168-3824
• DOI: 10.1080/02701367.2023.2293121

Background: The benefits of caffeine to physical performance have been extensively demonstrated, however, it has recently been speculated that there is an effect of the administration route on its effectiveness. Purpose: The current study investigated the effect of caffeine mouth rinse in isolation or combined with ingestion on performance in a 30-minute constant-load exercise followed by a 10-km cycling time trial. Methods: Ten physically active men performed a 30-minute constant-load exercise at 50% of the graded test Wmax, followed by a 10-km cycling time trial. Before and at the middle points of the constant-load exercise and 10-km cycling time trial, the following conditions were administered: PLA (cellulose ingestion plus mouth rinsing with magnesium sulfate), ING (5 mg.kg −1 of caffeine ingestion plus mouth rinsing with magnesium sulfate), MR (cellulose ingestion plus mouth rinsing with 1.2% caffeine), and COMB (5 mg.kg −1 of caffeine ingestion plus mouth rinsing with 1.2% caffeine). Results: During the 30-minute constant-load exercise, COMB presented a lower rating of perceived exertion (RPE) than MR (p = .04). For the 10-km time trial, the COMB was faster than MR (MR = 1363 ± 345 vs. COMB = 1291 ± 308s, Δ% = 5.57, p = .05). Mean power output was higher in COMB than PLA, ING, and MR (234 ± 15 vs. 169 ± 29, 148 ± 11, and 145 ± 12 W, respectively). There were no differences between conditions for heart rate and RPE during the 10-km time trial. Conclusion: In summary, caffeine mouth rinsing potentiated the effects of caffeine ingestion during the 10-km time trial compared to caffeine mouth rinsing alone.