Hormonal responses to a 160-km race across frozen Alaska

Abstract

These data suggest a suppression of the hypopituitary-gonadal axis potentially mediated by amplification of adrenal stress responses to such an ultra-endurance race in environmentally stressful conditions.

The Impact of an Ultramarathon on Hormonal and Biochemical Parameters in Men

“…23 The low testosterone concentrations exhibited by these athletes may be a result of chronic endurance exercise training, a finding in accordance with previous research. 13 Additionally, basal concentrations of LH were within the normal range (3 to 25 U/L), 23 and thus, the failure of LH signaling, which might be thought to increase with decreasing testosterone concentrations, may reflect HPT abnormalities. This is consistent with both Wheeler et al 24 and Hackney et al 25 showing this phenomenon in endurance-trained athletes.…”

The effect of diet components on the level of cortisol

“…In response to a long-lasting endurance effort, especially under conditions of low temperature and at high altitudes, an increase in cortisol level is observed [16][17][18]. In addition, on level of this hormone are affecting emotional factors associated with start in competition and the extreme burden and psychological exhaustion [18,19].…”

Suplementações nutricionais e estresse oxidativo: implicações na atividade física e no esporte

“…Este comprometimento da disponibilidade de glutamina pode ocorrer tanto em razão da redução de sua síntese, quanto pelo aumento na sua utilização pelo organismo (D'SOUZA;TUCK, 2004). O aumento da concentração de hormônios contra reguladores, tais como o cortisol, a acidose metabólica induzida pelo exercício, o aumento da captação e utilização de glutamina por células do sistema imune e a gliconeogênese hepática são alguns dos mecanismos pelo quais a disponibilidade de glutamina torna-se comprometida PETRY;KRAEMER et al, 2008).…”