Repeated mouth rinsing of coffee improves the specific-endurance performance and jump performance of young male futsal players

Background Mouth-rinsing with ergogenic solutions such as carbohydrate and caffeinated drinks has been considered among athletes as a practical nutritional strategy. Therefore, this study aimed to determine the effect of repeated coffee mouth-rinsing (CMR) doses on specific performances of futsal players. Method Twenty-four male futsal players randomly participated in this randomized, double-blind, and crossover design study. During the intervention, participants were randomly placed in four different conditions including 1. low-dose CMR (LDC, n = 6, similar to 60 mg caffeine); 2. high-dose CMR (HDC, n = 6, similar to 125 mg caffeine); 3. decaffeinated CMR (PLA, n = 6, similar to 10 mg caffeine); and 4. no CMR (CON, n = 6). Vertical jump height was measured at baseline, baseline after CMR (baseline-CMR), immediately after the intermittent futsal endurance test (FIET) (IA-FIET), 5 min after the FIET (5 '' A-FIET) and 10 min after the FIET (10 '' A-FIET). Perceived fatigue was also measured by visual analogue scale (VAS) at baseline, IA-FIET, 5 '' A-FIET, and 10 '' A-FIET. CMR was also performed at baseline, during FIET (Repeated between levels), and 10 ' A-FIET. The collected data were analyzed (with SPSS software) by one- and two-way repeated measure ANOVA and Bonferroni post hoc test at P < 0.05 level. Results The findings of the present study illustrated that the perceived fatigue in IA-FIET increased significantly compared to the baseline which was accompanied by a significant decrease in 5 '' A-FIET and 10 '' A-FIET compared to IA-FIET (P < 0.05), and no significant difference was observed between conditions in the baseline, IA-FIET, 5 '' A-FIET, and 10 '' A-FIET (P > 0.05). However, HDC and LDC rose significantly the distance covered in FIET compared to CON and PLA (P < 0.05). In addition, HDC increased the FIET performance more than LDC (P < 0.05). Although there was no difference between any of the conditions at baseline (P > 0.05), baseline-CMR increased significantly the vertical jump height (P < 0.05). At IA-FIET, vertical jump height decreased to baseline levels in CMR conditions but increased in 5 '' A-FIET, which remained constant until 10 '' A-FIET (P < 0.05). In addition, vertical jump height in HDC and LDC conditions was significantly higher than CON in IA-FIET, 5 '' A-FIET, and 10 '' A-FIET. Conclusion This study showed that repeated CMR with low and high doses is a useful strategy to improve specific futsal performance. However, higher dose CMR appears to have more profound effects on performance improvement than lower doses.

Automated summary

This study aimed to determine the effect of repeated coffee mouth-rinsing (CMR) doses on specific performances of futsal players. The findings showed that repeated low and high doses of CMR are useful strategies to improve specific futsal performance, with higher dose CMR having a more profound effect on performance improvement than lower doses.