title: Effects of morning caffeine' ingestion on mood States, simple reaction time, and short-term maximal performance on elite judoists.
abstract: OBJECTIVE
  The purpose of the present study was to evaluate the ergogenic effect of caffeine ingestion on mood state, simple reaction time, and muscle power during the Wingate test recorded in the morning on elite Judoists.
  
  
  METHODS
  TWELVE ELITE JUDOISTS (AGE: 21.08 ± 1.16 years, body mass: 83.75 ± 20.2 kg, height: 1.76 ±6.57 m) participated in this study. Mood states, simple reaction time, and muscle power during the Wingate test were measured during two test sessions at 07:00 h and after placebo or caffeine ingestion (i.e. 5 mg/kg). Plasma concentrations of caffeine were measured before (T0) and 1-h after caffeine' ingestion (T1) and after the Wingate test (T3).
  
  
  RESULTS
  Our results revealed an increase of the anxiety and the vigor (P<0.01), a reduction of the simple reaction time (P<0.001) and an improvement of the peak and mean powers during the Wingate test. However, the fatigue index during this test was unaffected by the caffeine ingestion. In addition, plasma concentration of caffeine was significantly higher at T1 in comparison with T0.
  
  
  CONCLUSIONS
  In conclusion, the results of this study suggest that morning caffeine ingestion has ergogenic properties with the potential to benefit performance, increase anxiety and vigor, and decrease the simple reaction time.
authors.affiliation: Laboratory of Pharmacology, Faculty of medicine, University of Sfax, Tunisia ; Research Unit, High Institute of Sport and Physical Education, University of Sfax, Tunisia.
authors.forename: Makram
authors.initials: M
authors.lastname: Souissi
authors.forename: Salma
authors.initials: S
authors.lastname: Abedelmalek
authors.forename: Hamdi
authors.initials: H
authors.lastname: Chtourou
authors.forename: Rim
authors.initials: R
authors.lastname: Atheymen
authors.forename: Ahmed
authors.initials: A
authors.lastname: Hakim
authors.forename: Zouhair
authors.initials: Z
authors.lastname: Sahnoun