Short-term resource allocation during extensive athletic competition.

Autor: Longman DP; Department of Archaeology and Anthropology, University of Cambridge, Cambridge, United Kingdom., Prall SP; Laboratory for Evolutionary Medicine, Department of Anthropology, University of Texas at San Antonio, San Antonio, Texas., Shattuck EC; Laboratory for Evolutionary Medicine, Department of Anthropology, University of Texas at San Antonio, San Antonio, Texas., Stephen ID; Department of Psychology, Macquarie University, Sydney, Australia., Stock JT; Department of Archaeology and Anthropology, University of Cambridge, Cambridge, United Kingdom.; Department of Anthropology, Western University, London, Ontario N6A 3K7, Canada., Wells JCK; UCL Institute of Child Health, Childhood Nutrition Research Centre, London, United Kingdom., Muehlenbein MP; Laboratory for Evolutionary Medicine, Department of Anthropology, Baylor University.
Jazyk: angličtina
Zdroj: American journal of human biology : the official journal of the Human Biology Council [Am J Hum Biol] 2018 Jan; Vol. 30 (1). Date of Electronic Publication: 2017 Oct 10.
DOI: 10.1002/ajhb.23052
Abstrakt: Objectives: Following predictions from life history theory, we sought to identify acute trade-offs between reproductive effort (as measured by psychological arousal) and somatic maintenance (via functional measures of innate immunity) during conditions of severe energetic imbalance.
Methods: Sixty-six male ultramarathon runners (ages 20 to 37 years) were sampled before and after a lengthy race. Saliva and sera were collected for testosterone and immunological analyses (hemolytic complement activity and bacterial killing ability). Lean body mass was assessed by bioelectrical impedance, and libido was measured using a slideshow of arousing and neutral images.
Results: Following predictions, there was a significant decrease in salivary testosterone levels (109.59 pg/mL versus 97.61 pg/mL, P < .001) and arousal scores in response to provocative images (5.40 versus 4.89, P = .001) between prerace and postrace time points. Additionally, participant bacterial killing ability (P = .035) and hemolytic complement activity (P = .021) increased between prerace and postrace.
Conclusions: Decreased libido and testosterone with concomitant heightened innate immune responses suggest a shift in energetic priorities away from reproduction and toward maintenance/defense during a period of energetic stress.
(© 2017 The Authors. American Journal of Human Biology Published by Wiley Periodicals, Inc.)
Databáze: MEDLINE
Externí odkaz: