Purpose: This study aimed to investigate the impact of mental fatigue on heart rate variability, subjective measures fatigue, and swimming performance in young athletes. Methods: Sixteen swimmers [15.45 (0.51) y old, 7.35 (2.20) experience] performed a 1500-m time trial 2 occasions separated by an interval at least 72 hours. The was preceded 30-minute treatment that consisted performing Stroop Color Word test induce (experimental trial) or watching emotionally neutral video (control trial)....

Recovery dynamics in combat sports like judo are critical for optimizing performance and reducing injury risk. This study aimed to evaluate the time-course of physiological (creatine kinase, CK) neuromuscular (countermovement jump, CMJ) recovery junior athletes following competition. Thirteen junior-level participated this study. Assessments CK CMJ were conducted at three points: 24 hours before, after, 48 after A repeated-measures ANOVA was used analyse differences across time points,...

What is the central question of this study? The aim was to identify factors predicting body core temperature athletes at end a 10 km self-paced run in hot environment. main finding and its importance? Hyperthermia subjected running depends on several factors, highlighting integrated control during exercise under environmental heat stress. Five seven variables that significantly predicted are not invasive and, therefore, practical for use outside laboratory environment: heart rate, sweat...

Summary The purpose of this study was to examine the effect menstrual cycle phase on maximal oxygen uptake ( ) and associated cardiodynamic responses. A total 16 active females volunteered which n = 10 formed non‐oral contraceptive pill group (n‐ OCP ), displaying a regular 28·4 ± 2·2 days (age 20·6 1·6 years, height 169·9 6·4 cm, mass 68·7 7·9 kg) 6 oral (monophasic pill) 21·7 years 2·16, 168·1 cm 6·8 61·6 kg). Each completed four incremental exercise tests for determination , cardiac...

Ramos, GP, Nakamura, FY, Penna, EM, Mendes, TT, Mahseredjian, F, Lima, AM, Garcia, ES, Prado, LS, and Coimbra, CC. Comparison of physical fitness anthropometrical profiles among Brazilian female soccer national teams from U15 to senior categories. J Strength Cond Res 35(8): 2302-2308, 2021-This study aimed compare anthropometric team players the categories, performance between selected nonselected players. Subjects included 231 athletes (U15, n = 46, U17, 49, U20, 98, Senior, 38). Body mass,...

ABSTRACT Introduction: This study involved an analysis of the impact mental fatigue on heart rate recovery (HRR), subjective measures and intermittent running performance in handball players. Objective: was aimed at (1) examining effects induced state aerobic players, as measured by Yo-Yo IR1 test, (2) exploring possible changes regulation through HRR analysis. Methods: Twelve players (age: 17.50 ± 3.63 years; 5 2.2 years practice) undertook a test two occasions, separated interval least 72...

Objective: This study compared the activity profile of different types soccer-specific training with demands competitive international female match-play.Methods: Twenty-one players from Brazilian National Soccer Team were monitored in twenty-two on-field sessions during 30-day preparatory camp prior to 2016 Olympic Games. Activities categorized into warmup (WU), small sided games (SSG), technical and tactical (TTT) friendly matches (FM). The each type drill was then ones 6 performed Rio...

Background: Mental fatigue is a psychobiological state caused by extended periods of cognitive effort, and evidence suggests that mentally fatigued athletes present impaired physical performance. Different ergogenic aids have been proposed to counteract the deleterious effects mental fatigue, but whether brain stimulation can still unknown. This scenario even more obscure considering these interventions (mental induction stimulation) in very experienced population consisting master athletes....

The aim of this study was to compare the maximal lactate steady state (MLSS) and ventilatory threshold (VT) under different environments (TEMP: 22°C; HOT: 40°C; 50% RH). 8 male subjects (age 23.9±2.4 years, body mass 75.9±7.3 kg VO2max 47.8±4.9 mL·kg−1·min−1) performed a series tests determine peak workload (Wpeak), VT MLSS on cycle ergometer. Wpeak higher in TEMP as compared HOT condition (225±9 W vs. 195±8 W, respectively; p<0.05). at 22°C (180±11 W) than 40°C (148±11 W; p<0.05), well...

This study examined the effects of precooling on performance and pacing during 30-km cycling exercise in hot temperate environments. 8 trained male cyclists performed 4 trials involving either cooling (PRECTEMP PRECHOT) or no-cooling interventions (TEMP HOT) prior to a self-paced (35°C, 68% relative humidity) environment (24°C, humidity). Exercise time was longer HOT (60.62±3.47 min) than TEMP (58.28±3.30 min; P<0.001), attenuated this thermal strain impairment (PRECHOT 58.28±3.30 P=0.048),...

The aim of this study was to assess the suitability body mass index, waist circumference, waist-to-height ratio and aerobic fitness as predictors cardiovascular risk factor clustering in children. A cross-sectional conducted with 290 school boys girls from 6 10 years old, randomly selected. Blood collected after a 12-hour fasting period. pressure, circumference (WC), height weight were evaluated according international standards. Aerobic (AF) assessed by 20-metre shuttle-run test. Clustering...

Abstract This study aimed to evaluate the effect of head pre‐cooling on 5‐km time‐trial performance amateur runners in heat. In a counterbalanced design, 15 male (22.6 ± 3.5 y; VO 2 max heat 42.3 4.4 mLO /kg/min) completed two time trials performed (35°C, 50% relative humidity). one trial (HCOOL), participants underwent 20 min cooling temperate environment (23°C, 70% humidity) prior exercise. another (CON), exercise was preceded by rest under same temperature conditions. Exercise shorter...

Abstract This study investigated improvements in sugarcane ethanol production by adapting yeast strains for very high gravity fermentation. Two (C22 and Y904) were adapted eight fermentation cycles with increasing initial sugar content from 56.2 to 296.1 g L −1 (Experiment 1). After the last cycle, “adapted” yeasts recycled a wort containing compared their respective that not subjected adaptation process 2). Fermentative parameters analyzed osmotic stress on cell morphology was assessed...

The aim of this study was to verify the agreement urine, body mass variations and plasma parameters determine hydration status 14 male runners (29±4 years 54.3±5.5 mLO2/kg/min) in an official 21.1 km road race.The mean dry-bulb temperature air relative humidity during race were 25.1±2.1 °C 54.7±2.2%, respectively. volume water ingested by monitored using marked volumetric plastic bottles provided at stations located 0, 2.5, 5.0, 7.5, 10.5, 14.0, 16.0 18.5 from starting line. Hydration...

Talent identification and development in youth soccer are complex multidimensional processes. This scoping review aimed to explore the current literature regarding variables used talent process soccer. study was developed referring Preferred Reporting Items for Systematic Reviews Meta-Analyses Scoping (PRISMA-ScR) guidelines. Pubmed, Web of Science Scopus databases were searched from September October 2023. Only peer-reviewed journal articles published English included, with no limitation...

Campos, BT, Penna, EM, Rodrigues, JGS, Mendes, TT, Maia-Lima, A, Nakamura, FY, Vieira, ÉLM, Wanner, SP, and Prado, LS. Influence of mental fatigue on physical performance, physiological perceptual responses judokas submitted to the Special Judo Fitness Test. J Strength Cond Res 36(2): 461-468, 2022-Mentally fatigued athletes present impaired aerobic strength endurance, manual dexterity, despite no changes in anaerobic performance maximal muscle power. Noteworthy, effect during high-intensity...

The purpose of this study was to evaluate the effects human head hair on thermoregulation during exercise carried out under solar radiation. 10 healthy male subjects (mean±SD: 25.1±2.5 yr; height: 176.2±4.0 cm; weight: 73.7±6.7 kg; V˙O2max 56.2±5.3 mLO2·kg−1·min−1) took part in 2 1 h-long trials continuous a treadmill at 50% radiation that were separated by least days. Whereas for first trial they retained their natural (HAIR), second totally shaved (NOHAIR). Several properties measured,...

The aim of the present study was to determine association between results in counter movement jump (CMJ) and first 10 meters, final 20 meters total 30 a 30-meter sprint. One-hundred sixty seven Soccer players from professional (N. 93) under twenty 74) categories, Brazilian division club participated study. sprint test consisted run timed at 10-meter marks. capacity assessed through CMJ. Pearson's correlation (r) used these variables. significance level adopted p<.05. U-20 presented faster...

Evidence indicates that aerobic performance is degraded either by environmental heat stress or sleep deprivation. However, whether these conditions interact to produce more significant impairment deserves further investigation. Therefore, this study investigated the effects of experimental deprivation (24 h 96 h) on and thermoregulatory responses in rats exercised a treadmill at different conditions. Adult male Wistar were subjected rapid eye movement (RSD) using modified multiple platform...