We tested the effectiveness of a 2-wk motivational self-talk (MST) intervention-specific to heat tolerance-on endurance capacity and cognitive function in heat.Eighteen trained male (n = 14) female 4) cyclists randomly received 2 wk MST training 9) or control regimen (CON, n 9). The experimental protocol was PRE/POST design consisting 30 min cycling at 60% peak power output (PPO) (35°C, 50% relative humidity, ~3.0 m·s airflow), 30-min rest period, followed by time exhaustion (TTE) test 80%...

Abstract McKinlay, BJ, Wallace, P, Dotan, R, Long, D, Tokuno, C, Gabriel, and Falk, B. Effects of plyometric resistance training on muscle strength, explosiveness, neuromuscular function in young adolescent soccer players. J Strength Cond Res 32(11): 3039–3050, 2018—This study examined the effect 8 weeks free-weight (RT) (PLYO) maximal jump performance compared with no added (CON), male Forty-one 11- to 13-year-old players were divided into 3 groups (RT, PLYO, CON). All participants...

Using intravenous infusion, we separated the physiologic consequences of 3% body mass dehydration from conscious awareness fluid replacement on time trial (TT) performance in heat. Eleven trained cyclists performed 90 min steady-state (50% V ˙ O 2 peak ) cycling followed by a self-paced 20-km TT hot-dry (35 °C, 10% relative humidity, wind speed 3.0 m/s) environment while euhydrated-not thirsty (EU-NT), euhydrated-thirsty (EU-T), dehydrated-not (DH-NT), or dehydrated-thirsty (DH-T). Thirst...

This study examined changes in salivary testosterone and cortisol following resistance plyometric exercise protocols active boys. In a crossover experimental design, 26 peri-pubertal (12- to 14-year-old) soccer players performed 2 trials random order, on separate evenings, 1 week apart. Each trial included 30 min control session followed by of either or exercise. Saliva was collected at baseline, post-control (i.e., pre-exercise), 5 post-exercise. There were no significant differences the...

Background During a period of intensified exercise (e.g. training/identification camps), often undertaken by competitive youth athletes, the maintenance muscle function and peak performance can become challenging due to an accumulation fatigue. The provision post-exercise dairy protein in adults has been previously shown accelerate recovery; however, its efficacy athletes is currently unknown. Therefore, purpose this study was examine effects increased consumption with plain Greek yogurt...

In explosive contractions, neural activation is a major factor in determining the rate of torque development, while latter an important determinant jump performance. However, contribution neuromuscular and development to performance children youth unclear. The purpose this study was examine relationships between activation, peak torque, young male athletes. Forty-one 12.5 ± 0.5-year-old soccer players completed explosive, unilateral isometric dynamic (240°/s) knee extensions (Biodex System...

We tested the effects of cold air (0°C) exposure on endurance capacity to different levels strain ranging from skin cooling core Δ-1.0°C. Ten males completed a randomized, crossover, control study consisting cycling time exhaustion (TTE) at 70% their peak power output following:

Abstract This study tested the effects of skin and core cooling on cognitive function in 0°C cold air. Ten males completed a randomized, repeated measures consisting four environmental conditions: (i) 30 min exposure to 22°C thermoneutral air (TN), (ii) 15 which cooled temperature ~27°C (CS), (iii) causing mild ∆‐0.3°C from baseline (C‐0.3°C) (iv) ∆‐0.8°C (C‐0.8°C). Cognitive (reaction time [ms] errors made [#]) were using simple reaction test, two–six item working memory capacity task,...

We compared two methods of partitional calorimetry to calculate heat storage and debt during cold air (0°C) exposure causing mild core cooling. Twelve participants performed a 5 min baseline in thermoneutral conditions (∼22.0°C, ∼50% relative humidity) followed by (∼0°C) until rectal temperature was reduced ∆−0.5°C. Partitional used avenues exchange (radiative, convective, evaporative), storage, continuously throughout exposure. deriving these variables using prediction equations based on...

Dopamine activity can modulate physical performance in the heat, but less is known about its effects on cognition during thermal stress. Twelves males completed a randomized, double-blinded protocol consisting of oral ingestion 20 mg methylphenidate (MPH) or placebo (lactose pill) passive heating using water-perfused suit (water temperature ∼49 °C). To identify impact peripheral versus central strain, cognitive test battery was at 4 different states: baseline (BASE; 37.2 ± 0.6 °C core, 32.9...

This study compared cranial (CC) with passive (CON) cooling during recovery on tolerance to subsequent exercise while wearing firefighting protective ensemble and self-contained breathing apparatus in a hot-humid environment. Eleven males (mean ± SD; age, 30.9 9.2 years; peak oxygen consumption, 49.5 5.1 mL · kg(-1) min(-1)) performed 2 × 20 min treadmill walks (5.6 km h(-1), 4% incline) 35 °C 60% relative humidity. During 20-min (rest), participants sat removed gloves, helmets, flash hoods...

We performed a firefighting simulation of repeated work-rest bouts while wearing fire-fighting ensemble (FFE) and self-contained breathing apparatus (SCBA) in the heat, removing helmet SCBA during recovery comparing cranial cooling (CC) versus passive (CON) exposure. hypothesized that CC would better counteract heat storage compared to cooling.

Increases in body temperature from heat stress (i.e., hyperthermia) generally impairs cognitive function across a range of domains and complexities, but the relative contribution skin versus core changes remains unclear. Hyperthermia also elicits hyperventilatory response that decreases partial pressure end-tidal carbon dioxide (PetCO2) subsequently cerebral blood flow may influence function. We studied role along with PetCO2 on domains. Eleven males completed randomized, single-blinded...