Neuromechanical measurement of the effect of carbohydrate mouth rinse on human performance in strength and elite cycling endurance

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dc.contributor.authorJensen, Matthew
dc.contributor.supervisorKlimstra, Marc D.
dc.date.accessioned2018-05-01T15:47:44Z
dc.date.available2018-05-01T15:47:44Z
dc.date.copyright2018en_US
dc.date.issued2018-05-01
dc.degree.departmentSchool of Exercise Science, Physical and Health Education
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractThe overarching goal of this dissertation is to refine methods employed for assessing neuromuscular changes and associated power/force outputs during various perturbations of fatigue, direct or perceived, induced by either exercise or nutritional interventions, with associated performance outcomes. To address this goal, we collected physiological and biomechanical data from subjects across a set of experiments designed to induce different levels of fatigue by the implementation of various exercise and nutritional interventions to cause various levels of fatigue in an ecologically valid manner. The data sets were collected during a single joint task and during cycling trials. During these experimental trials, we collected measures of kinetics (force and cycling power) as well as muscle activation (EMG) and physiological measures (heart rate, rating of perceived exertion, blood lactate, blood glucose, ventilation, oxygen uptake and carbon dioxide production) to investigate the overall performance, as well as potential mechanisms for improved performance related to the exercise and nutritional interventions. In order to substantially enhance the collection of cycling kinetics and kinematics, we have developed an innovative sensor that improved the measurement resolution (temporal and spatial) of a commercial research grade power meter. Using these improved measures alongside advanced muscle activity analysis, we could ameliorate an experimental framework that could be used to investigate changes in fatigue and coordination pattern associated with exercise and nutritional interventions. Investigation of the effects of a CHO mouth rinse vs. placebo on force and muscle activity during a very short (<3 min) neuromuscular demanding fatiguing trial demonstrated a consistent change in EMG median frequency related to increased fatigue in both experimental conditions, providing little evidence of change in neuromuscular strategy associated with CHO mouth rinse. Further investigation explored the effects of a CHO mouth rinse vs. placebo using fundamental physiological measures of neuromuscular activation and overall performance measures during an ecologically valid late endurance cycling time trial. Our results demonstrated that while there was no overall effect noticed for time to completion, there was a significant decrease in performance in the time to complete various components of the time trial during the placebo trial only. Muscle activity of the lower leg (MG and SOL) demonstrated a modification in frequency only evident during the placebo condition. Application of principal component analysis to power output and the EMG intensity profiles of the muscles of the lower leg during the pedal cycle revealed a more detailed understanding of the effect of CHO mouth rinse on performance during cycling. The average power output profile in WASH showed an earlier onset in the pedal cycle, greater duration and higher amplitude versus PLA during the TT. Additionally, only the PLA condition showed a significant increase in muscle activation throughout the time trial, which could be evidence of fatigue. This dissertation shows for the first time that CHO mouth rinse may have a substantial effect on the maintenance of power while mitigating the impact of neuromuscular fatigue, in late endurance performance, further strengthen our assertion that CHO may, in fact, minimize the changes in performance that are associated with fatigue during late endurance fatiguing events.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.bibliographicCitationJensen, M. P., Klimstra, M. D., Sporer, B., & Stellingwerff, T. (2018). Effect of carbohydrate mouth rinse on performance after prolonged submaximal cycling. Medicine & Science in Sports & Exercise, 50(5), 1031-38.en_US
dc.identifier.bibliographicCitationJensen, M. P., Stellingwerff, T., & Klimstra, M. (2015). Carbohydrate Mouth Rinse Counters Fatigue Related Strength Reduction. International Journal of Sport Nutrition and Exercise Metabolism, 25(3), 252–261.en_US
dc.identifier.urihttp://hdl.handle.net/1828/9322
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectCarbohydrate mouth rinseen_US
dc.subjectfatigueen_US
dc.subjectelite sporten_US
dc.subjectCyclingen_US
dc.subjectStrengthen_US
dc.subjectNeuromechanicsen_US
dc.subjectErgolytic Aiden_US
dc.titleNeuromechanical measurement of the effect of carbohydrate mouth rinse on human performance in strength and elite cycling enduranceen_US
dc.typeThesisen_US

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