title: Carbohydrate Mouth Rinsing: Improved Neuromuscular Performance During Isokinetic Fatiguing Exercise.
abstract: OBJECTIVE
  To determine whether repeated carbohydrate (CHO) mouth rinsing would improve neuromuscular performance during high-intensity fatiguing contractions.
  
  
  METHODS
  Eighteen young men (age 26.1 ± 5.0 y, BMI 22.9 ± 1.9) performed 3 maximal voluntary isometric contractions (MVICPRE). Immediately after, they completed 10-second mouth rinse with 6.4% maltodextrin solution (MAL), 7.1% glucose solution (GLU), water (W), artificially sweetened solution (PLA), or a control trial with no rinse (CON) in a crossover protocol. Subjects performed 5 sets of 30 isokinetic fatiguing contractions at 180°/s, and an MVICPOSTwith their elbow flexors was performed after each mouth rinse. Mechanical and electromyographic (EMG) signals were recorded from the biceps brachii and parameters of interest analyzed.
  
  
  RESULTS
  When rinsing the mouth with a solution containing CHO, independently of the sweetness, isokinetic performance was enhanced as shown by the greater total work achieved in comparison with CON. The decay of torque and mean fiber-conduction velocity (MFCV) recorded at the end of the fatiguing task was lower when rinsing the mouth with GLU than with CON. The torque recorded during the MVICPOSTwas greater with CHO with respect to CON, and this was associated to a lower decay of MFCV.
  
  
  CONCLUSIONS
  CHO mouth rinse counteracts fatigue-induced decline in neuromuscular performance, supporting the notion that CHO rinse may activate positive afferent signals able to modify motor output. Repeated mouth rinsing with sweet and nonsweet CHO-containing solutions can improve neuromuscular performance during an isokinetic intermittent fatiguing task.
authors.forename: Ilenia
authors.initials: I
authors.lastname: Bazzucchi
authors.forename: Federica
authors.initials: F
authors.lastname: Patrizio
authors.forename: Francesco
authors.initials: F
authors.lastname: Felici
authors.forename: Andrea
authors.initials: A
authors.lastname: Nicolò
authors.forename: Massimo
authors.initials: M
authors.lastname: Sacchetti
mesh_terms: D000328:Adult; D018592:Cross-Over Studies; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods; D005947:Glucose / Q000008:administration & dosage; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D008320:Maltose / Q000008:administration & dosage; D009067:Mouthwashes / Q000008:administration & dosage*; D018763:Muscle Fatigue / Q000502:physiology*; D018482:Muscle, Skeletal / Q000294:innervation / Q000502:physiology*; D010465:Perception / Q000502:physiology; D010807:Physical Endurance / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D011134:Polysaccharides / Q000008:administration & dosage; D013549:Sweetening Agents / Q000008:administration & dosage*
chemical_list: D004040:Dietary Carbohydrates; D009067:Mouthwashes; D011134:Polysaccharides; D013549:Sweetening Agents; D008320:Maltose; C008315:maltodextrin; D005947:Glucose
keywords: elbow flexors; electromyography; isokinetic dynamometry; strength