Abstract details
| Abstract-ID: | 1927 |
| Title of the paper: | The effect of caffeine and priming exercise on neuromuscular fatigue: isometric vs dynamic force assessments in trained cyclists |
| Authors: | Antonacci Guglielmo, L.G., Fernandes, E.M.1,2, Borszcz, F.K.1,3, Ventura, T.P.1, de Lucas, R.D.1 |
| Institution: | 1Federal University of Santa Catarina; 2University of the Extreme South of Santa Catarina; 3University of Santa Catarina State |
| Department: | 1Physical Effort Laboratory, Sports Center; 2Physical Education; 3Human Performance Research Group, Center for Health and Sport Sciences |
| Country: | Brazil |
| Abstract text | INTRODUCTION: This study aimed to investigate the combined effect of caffeinated chewing gum (GUMCAF) and priming high-intensity exercise on neuromuscular fatigue involving isometric and dynamic force measures in trained cyclists. METHODS: Fifteen male participants performed a maximal incremental cycling test and four visits each composed of two bouts of 6 min cycling at ?70 intensity (?1 and ?2) separated by 5-min of unloaded cycling. Neuromuscular performance/fatigue was assessed by isometric force trough maximal voluntary contraction (IMVC - knee extension) with twitch interpolation technique and by all-out cycling sprints (i.e. dynamic force), before and at the end of ?2 exercises. The GUMCAF (400?mg) and placebo gum (GUMPLA) were administered in a randomized double-blind procedure, where in two visits the participants chewed a GUMCAF and in the other two GUMPLA. RESULTS: The results showed no gum × condition interaction for both force measurements (P>0.05). The percentage change of dynamic and isometric measurements, from baseline to the end of ?2 showed no difference, for both gum conditions (P>0.05). However, low to moderate correlations were found between maximal cycling power and IMVC (r = 0.486 and r = 0.336) and, maximal cycling torque and IMVC (r = 0.308 and r = 0.314), for CAF and PLA conditions, respectively. CONCLUSION: No additional effect of CAF over priming exercise on neuromuscular fatigue was detected, indicating that GUMCAF did not attenuate the fatigue in both dynamic and isometric assessments, during successive high-intensity exercise protocols. Finally, the results suggest a possible interchangeable assessment between dynamic and isometric performance/fatigue variables. |
| Topic: | Physiology |
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