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Tonkonogi * 1 2014 9 1 12 18 10.1123/ijspp.2012-0172 Changes in Technique and Efficiency After High-Intensity Exercise in Cross-Country Skiers Christina Åsan Grasaas * Gertjan Ettema * Ann Magdalen Hegge * Knut Skovereng * Øyvind Sandbakk * 1 2014 9 1 19 24 10.1123/ijspp.2013-0344 Physiological

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Teun van Erp, Marco Hoozemans, Carl Foster and Jos J. de Koning

, while spending the same amount of kJ. There was no significant effect of exercise intensity on the relation between sRPE and kJ spent. This could be a reason for the weaker dose–response relationship in relation with aerobic fitness 9 , 20 as high-intensity exercise is a critical part of the training

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Gabrielle Ringenberg, Jill M. Maples and Rachel A. Tinius

tests are time-efficient and easier to administer. These tests are typically used among patients who have increased risk for cardiovascular events and/or other contraindications to high-intensity exercise (i.e., exercising to volitional fatigue is not advisable; Pescatello et al., 2014 ), or when

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Llion A. Roberts, Johnpaul Caia, Lachlan P. James, Tannath J. Scott and Vincent G. Kelly

muscles through low-frequency stimulation, specifically increasing calf arterial inflow. When considering ECP as an aid to assist recovery between repeated high-intensity exercise sessions, a number of mechanisms could potentially explain the improvement in performance. First, an increase in either local

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Jinger S. Gottschall, Joshua J. Davis, Bryce Hastings and Heather J. Porter

exercise time per week (30–40 min) above 90% HR max had the greatest salivary cortisol concentration after high-intensity exercise (Figure  1 ). There was no statistical difference between the groups with respect to any of the descriptive characteristics (age, mass, and height); total exercise time (Table

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Arthur H. Bossi, Cristian Mesquida, Louis Passfield, Bent R. Rønnestad and James G. Hopker

High-intensity interval training (HIIT) involves repeated bouts of high-intensity exercise interspersed with recovery periods. This method is typically employed to increase the training stimulus for the cardiorespiratory system over prolonged continuous exercise. Accordingly, much of the scientific

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Athanasios Kabasakalis, Stefanos Nikolaidis, George Tsalis and Vassilis Mougios

Kingdom); and plasma irisin (EK-067-29; Phoenix Pharmaceuticals, Burlingame, CA) in the pre and post samples. Hormonal concentrations in the 1-h post samples were not measured, as existing literature shows no meaningful differences between baseline and 1 h after high-intensity exercise. 22 , 23 Finally

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Melitta A. McNarry

adults ( 9 ) but a lower fall in muscle PCr and pH in children during exercise above the gas exchange threshold ( 10 , 111 ). Generally, these findings suggest a higher oxidative energy contribution during high-intensity exercise in children, with a reduced reliance on substrate-level phosphorylation

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Neil D. Clarke, Darren L. Richardson, James Thie and Richard Taylor

ergogenic effect on exercise performance. 2 Despite this, Astorino and Roberson 3 concluded that the mechanism by which caffeine provides an ergogenic effect in high-intensity exercise is likely to be multifactorial, with central factors such as adenosine antagonism being the most probable mechanism, but

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Cathal Cassidy, Kieran Collins and Marcus Shortall

( Collins et al., 2013 ). The high-intensity bouts of activity have been described as being stochastic and unstable in nature ( Malone et al., 2017a ). The major fuel utilized by skeletal muscle during high-intensity exercise is glycogen contained within the muscle ( Balsom et al., 1999a ). It has been