Abstract
PURPOSE: Previous investigations have found that the carbohydrate mouthwash can enhance endurance performance. We investigated the effect of carbohydrate mouth rinsing on elderly runners during 60 min running. METHODS: Nine elderly male runners (age 63±3, years; height 171±10 cm; weight 69.2±7.0 kg; 200±60 km weekly volume training; a minimum of 2 years’ experience in ≥10 km run) completed six time trail running after 2 familiarization session (60 min each). They was instructed and motivated to run at the maximum (self-selected) speed for 60 min. Visual feedback about time was available, but the chronometer was manipulated to real (NOR) or 10% more (SLO) or 10% less time (RAP). Immediately prior to and during the middle of each time trial, subjects mouth rinsed for 10s with 100 ml either a 6% maltodextrin solution (CHO) or an identically-flavored aspartame solution (PLA) in a randomized, counterbalanced, double-blind fashion. Total distance and heart rate (HR) was recorded. Ratings of perceived exertion (RPE) were assessed with the 20-point Borg scale at each 10-min. Data were analyzed with ANOVA two-way (2 treatments x 3 chronometer manipulations) repeated measures. Significant main effects were further analyzed using pairwise comparisons with Bonferroni post hoc tests. Statistical significance was set at the p≤ 0.05 level of confidence. Statistical analysis was completed using SPSS v17.0 for Windows (LEAD Technologies). RESULTS: CHO resulted in greater performances (i.e., greater distances) in all chronometers manipulations (NOR = 18,134±3,184 m; SLO = 18,746±2,912 m; RAP = 16,298±1,842 m) than in PLA (NOR = 17,064±2,562 m; SLO = 17,581±3,167 m; RAP = 15,626±1,990 m) (p≤0.05). Rating of Perceived Exertion (CHO NOR = 12.6±0.8; CHO SLO = 12.6±0.7; CHO RAP = 12.6±1.1; PLA NOR = 14.1±1.1; PLA SLO = 13.6±1.1; PLA RAP = 13.9±0.7) (p > 0.05), as well as the Heart Rate (CHO NOR = 148±17; CHO SLO = 145±19; CHO RAP = 149±19; PLA NOR = 149±15; PLA SLO = 145±24; PLA RAP = 152±18) (p > 0.05) did not exhibited significant main effects for treatments or chronometer manipulations. CONCLUSION: These results indicate that CHO mouth rinsing may enhance running performance independently of time deception in elderly runners. This enhancement occurs without modifications on heart rate and perceived exertion.
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