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Franck Brocherie, Grégoire P. Millet and Olivier Girard

Purpose:

To compare psychophysiological responses to 6 repeated-sprint sessions in normobaric hypoxia (RSH) and normoxia (RSN) in team-sport athletes during a 2-wk “live high–train low” training camp.

Methods:

While residing under normobaric hypoxia (≥14 h/d, FiO2 14.5–14.2%), 23 lowland elite field hockey players performed, in addition to their usual training, 6 sessions (4 × 5 × 5-s maximal sprints, 25-s passive recovery, 5 min rest) under either RSH (FiO2 ~14.5%) or RSN (FiO2 21%). Sprint 1 and 5 times, physiological strain (heart rate [HR], arterial oxyhemoglobin saturation [SpO2]), and perceptual responses (overall peripheral discomfort, difficulty breathing, and lower-limb discomfort) were monitored.

Results:

During the 1st session, HR increased across sets (P < .001) independently of the conditions, while SpO2 was globally lower (P < .001) for RSH (averaged value: 91.9% ± 1.2%) vs RSN (96.9% ± 0.6%). Thereafter, SpO2 and HR remained similar across sessions for each condition. While 1st-sprint time remained similar, last-sprint time and fatigue index significantly decreased across sets (P < .01) and sessions (P < .05) but not between conditions. Ratings of overall perceived discomfort, difficulty breathing, and lower-limb discomfort were higher (P < .05) in RSH vs RSN at the 1st session. During subsequent sessions, values for overall perceived discomfort (time [P < .001] and condition [P < .05] effects), difficulty breathing (time effect; P < .001), and lower-limb discomfort (condition [P < .001] and interaction [P < .05] effects) decreased to a larger extent in RSH vs RSN.

Conclusion:

Despite higher hypoxia-induced physiological and perceptual strain during the 1st session, perceptual responses improved thereafter in RSH so as not to differ from RSN. This indicates an effective acclimation and tolerance to this innovative training.

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Richard Ebreo, Louis Passfield and James Hopker

can be accounted for via expired gases measured at the mouth. However, during high-intensity exercise (HIE) with a significant anaerobic energy contribution, V ˙ O 2 measured at the mouth cannot be used to estimate the total energy expenditure. Therefore, conventional measurement of GE during

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Richard Latzel, Olaf Hoos, Sebastian Stier, Sebastian Kaufmann, Volker Fresz, Dominik Reim and Ralph Beneke

of physiological responses during field tests and simulated basketball games or drills. 3 , 11 Most studies highlight the importance of a well-developed aerobic capacity in basketball players for recovery from many accumulating short high-intensity exercise bouts. 5 , 12 , 13 Only 1 source could be

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Tony Adebero, Brandon John McKinlay, Alexandros Theocharidis, Zach Root, Andrea R. Josse, Panagiota Klentrou and Bareket Falk

boys in this study took part in a larger study designed to examine the effect of protein/carbohydrate consumption during recovery from high-intensity exercise on subsequent exercise performance and muscle damage. Data presented in this study do not include the assessment of protein

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Mitchell Naughton, Joanna Miller and Gary J. Slater

-intensity bout of exercise. This phenomenon is known as the repeated bout effect and has been studied extensively. 28 First identified by Highman and Altland, 29 the repeated bout effect has been noted following high-intensity exercise and eccentric muscle actions in both animal and human models. 7 , 28 The

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Andrea Nicolò, Marco Montini, Michele Girardi, Francesco Felici, Ilenia Bazzucchi and Massimo Sacchetti

command (ie, the activity of motor and premotor areas of the brain relating to voluntary muscle contraction) being a major input during high-intensity exercise. 12 , 14 Central command increases with work rate 28 , 29 and time-on-task. 30 , 31 Likewise, f R increased with work rate (Figure  1 ) and

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Alon Eliakim

levels were significantly lower in the high-intensity group, and FSH and P levels were higher compared with the model group. These results suggest that high-intensity exercise intervention can effectively prevent PCOS development. Commentary The diagnosis of PCOS is based on the coexistence of androgen

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Luana T. Rossato, Camila T.M. Fernandes, Públio F. Vieira, Flávia M.S. de Branco, Paula C. Nahas, Guilherme M. Puga and Erick P. de Oliveira

during high-intensity exercises, and further studies are necessary. Thus, the aim of our study was to investigate the effect of CHO mouth rinse on time to exhaustion in a short duration and high-intensity exercise protocol performed on a treadmill. Methods Subjects Ten young recreationally active male

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Luana Farias de Oliveira, Bryan Saunders and Guilherme Giannini Artioli

Sodium bicarbonate (SB) is an ergogenic supplement used to increase blood bicarbonate concentration, buffering capacity and, subsequently, high-intensity exercise capacity and performance ( McNaughton et al., 2016 ). There is a body of evidence indicating that SB is an effective ergogenic

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Jose A. Rodríguez-Marroyo, José G. Villa, Raúl Pernía and Carl Foster

, 5 , 6 this might have happened individually at another time. Consequently, the time analyzed in the different exercise intensity zones might have been altered. However, the general trend observed toward a greater contribution of high intensity exercise would not be affected. We consider that this