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Margo Mountjoy, Jorunn Sundgot-Borgen, Louise Burke, Kathryn E. Ackerman, Cheri Blauwet, Naama Constantini, Constance Lebrun, Bronwen Lundy, Anna Melin, Nanna Meyer, Roberta Sherman, Adam S. Tenforde, Monica Klungland Torstveit and Richard Budgett

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Ida A. Heikura, Arja L.T. Uusitalo, Trent Stellingwerff, Dan Bergland, Antti A. Mero and Louise M. Burke

-related concerns that the existence of low EA in males was acknowledged ( Mountjoy et al., 2014 ). Since then, several reports have confirmed that male athletes do indeed suffer from the negative consequences of low EA ( Tenforde et al., 2016 ), including low testosterone (TES; Gomez-Merino et al., 2002 ) and

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Alexandre Moreira, Arnaldo Mortatti, Marcelo Aoki, Ademir Arruda, Camila Freitas and Christopher Carling

This study investigated the contribution of salivary testosterone (sT) concentration, years from peak height velocity (YPHV) and height by body mass interaction on jumping performance (Countermovement jump; CMJ) and aerobic fitness (Yo-Yo intermittent endurance test, level 1) in young elite soccer players. Forty-five participants (age: 12.5 ± 0.5y; body mass: 48.6 ± 10.2kg, height: 155.7 ± 10.0cm) belonging to a top level Brazilian soccer club were evaluated at four time points across a single semester. None of the assessed players had reached PHV. The data from the four evaluations were averaged and multiple linear regression analysis conducted. For CMJ, the model explained 42.88% of the variance (R 2 = 42.88; p < .000); sT concentration was the primary contributor (R 2 = 32.84) and the YPHV contributed 9.95% of the variance. The model explained 28.50% (p < .000) of the variance in Yo-Yo. The sT was the primary and single significant contributor (R 2 = 21.32). A significant difference was noted between high and low testosterone groups divided a posteriori to CMJ performance (t = 3.35; p = .001). These results suggest an important role for hormonal status in interpreting physical performance in preadolescent soccer players.

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David R. Hooper, William J. Kraemer, Rebecca L. Stearns, Brian R. Kupchak, Brittanie M. Volk, William H. DuPont, Carl M. Maresh and Douglas J. Casa

suited to endurance exercise. In this case, these athletes may have been self-selected in to endurance exercise due to their predisposition to succeed in these events. Thus, naturally low testosterone may play a role in their success in these activities, rather than be a consequence of their training

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Mauricio Castro-Sepulveda, Jorge Cancino, Rodrigo Fernández-Verdejo, Cristian Pérez-Luco, Sebastian Jannas-Vela, Rodrigo Ramirez-Campillo, Juan Del Coso and Hermann Zbinden-Foncea

to be salty sweaters ( Lara et al., 2016 ). Therefore, the players in our study could be considered to be typical salt sweaters. Our results showed that the testosterone/cortisol ratio associates inversely to the sweat rate and to the rate of Na + loss. This suggests that individuals with low

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Daniël M. van Leeuwen, Fabian van de Bunt, Cornelis J. de Ruiter, Natasja M. van Schoor, Dorly J.H. Deeg and Kaj S. Emanuel

-015-3087-7 10.1007/s10067-015-3087-7 Schaap , L.A. , Pluijm , S.M.F. , Deeg , D.J.H. , Penninx , B.W. , Nicklas , B.J. , Lips , P. , … Visser , M. ( 2008 ). Low testosterone levels and decline in physical performance and muscle strength in older men: findings from two prospective cohort studies

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Sarah Staal, Anders Sjödin, Ida Fahrenholtz, Karen Bonnesen and Anna Katarina Melin

investigated and need to be explored. The use of RMR as a diagnostic tool alone is debatable as there may be a risk of both “false positive” and “false negative” results and should therefore be used in conjunction with other clinical signs, such as hypotension and underweight as well as subclinical low

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Louise M. Burke, Graeme L. Close, Bronwen Lundy, Martin Mooses, James P. Morton and Adam S. Tenforde

on endocrine systems, metabolic rate, and other issues involved in RED-S? • What is the effect of a riding season on testosterone concentrations, and what are the consequences of low testosterone levels? • How well do elite cyclists manage EA during Grand Tours? • Are there separate effects of

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Anna K. Melin, Ida A. Heikura, Adam Tenforde and Margo Mountjoy

prevalence of EDs/DE and physiological symptoms of LEA such as oligomenorrhea or FHA in women and low testosterone in men indicates, however, that many athletes are failing to balance energy expenditure with adequate energy intake (Figure  1 ; Mountjoy et al., 2018 ; Nattiv et al., 2007 ). In athletics

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Kirsty J. Elliott-Sale, Adam S. Tenforde, Allyson L. Parziale, Bryan Holtzman and Kathryn E. Ackerman

significantly lower free T3 values in amenorrheic versus eumenorrheic females and in males with testosterone within the lowest quartile of the reference range compared with males with testosterone values above this threshold. These groups, amenorrheic and low testosterone athletes, represent populations who