Banca de DEFESA: DANIEL CARVALHO PEREIRA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : DANIEL CARVALHO PEREIRA
DATA : 18/03/2019
HORA: 10:00
LOCAL: DEPARTAMENTO DE EDUCAÇÃO FÍSICA
TÍTULO:
EFFECT OF COGNITIVE AND PHYSICAL DEMAND ON COGNITIVE CONTROL AND IMPACT ON THE TIME TRIAL PERFORMANCE
PALAVRAS-CHAVES:
Proactive; Reactive; Fatigue.
PÁGINAS: 45
GRANDE ÁREA: Ciências da Saúde
ÁREA: Educação Física
RESUMO:
Introduction: Endurance sports are characterized by maintaining a goal for a long period of time. How this goal is maintained might be changed according to several stimuli (physical/mental), influencing the physical performance. The Dual Mechanisms of Cognitive Control (DMC) theory suggest that we act in two different ways when carrying out a task — proactively, maintaining the objective in a sustained manner; or reactively, recruiting attention only when necessary. Aims: Verifying the effect of physical and cognitive demands on the predominance of cognitive control (proactive/reactive); verify the relationship between the predominance of cognitive control and physical performance in a time trial; and verifying if the AX-CPT sustained attention test has an influence on physical performance and self-reported fatigue in cyclists. Methods: 12 male subjects who have been cyclists for 6.1±4.9 years, the mean age being 30.5±5.5 years old, BMI of 24.2±2.0 kg/m², maximum power of 285±54 watts, training frequency of 3.7±1.5 days and 135.9±61.1 km ridden per week. This cross-sectional study was carried out with four visits; the first one was to get familiarized with the scales and incremental exercise test; the second and third sessions were randomized, one having the cognitive test before the physical exercise (10 km time trial against the clock) and the other session with equivalent time of rest; the fourth session was destined only to the assessment of the body composition. Computerized AX-CPT was used to assess cognitive control, having the Proactive Behavioral Index (PBI) and the physical performance in time trial using a cycle ergometer. One-way ANOVA with Repeated Measures was performed to determine the effect of physical exercise with previous cognitive demand and physical exercise on the proactive and reactive cognitive control. The correlations (Pearson or Spearman) were used to verify the association between cognitive control and physical performance. The paired t-test was used to compare the physical performance between session. The Friedman test was used to verify the effect of AX-CPT on self-reported fatigue. The level of significance established was p < 0.05. Results: Physical exercise performed with previous cognitive demand caused a significant change in reaction time of PBI (PBI-RT) (F(2.22) = 6.754; p < 0.01; η2 = 0.380). Post hoc analysis demonstrated that there was a decrease in PBI-RT of basal 0.230 ± 0.109 ms to 0.142 ± 0.113 ms after the exercise with previous cognitive demand, a significant decrease of 0.088 ± 0.024 ms [mean ± standard error]. The correlation demonstrated a strong negative relationship between proactive cognitive control and the maximum power of incremental exercise test (r=-0.621), average power in control session (r=-0.590), relative power in control session (r=-0.626), average speed in control session (r=-0.589), maximum speed in control session (r=-0.587), average power in the session with previous cognitive demand (r=-0.587), average relative power in the session with previous cognitive demand (r=-0.615). The other comparisons were not significant (p>0.05). Conclusion: Physical exercise associated with a previous cognitive demand caused a decrease in proactive cognitive control towards reactive, as well as proactive cognitive control was related to a worse physical performance at the 10-km time trial.
MEMBROS DA BANCA:
Interno - 1793257 - ARNALDO LUIS MORTATTI
Interno - 1989744 - HASSAN MOHAMED ELSANGEDY
Externo à Instituição - FABIO YUZO NAKAMURA
Externo à Instituição - HENRIQUE BORTOLOTTI