Short-term resource allocation during extensive athletic competition
Authors: Longman, D.P., Prall, S.P., Shattuck, E.C., Stephen, I.D., Stock, J.T., Wells, J.C.K. and Muehlenbein, M.P.
Journal: American Journal of Human Biology
Volume: 30
Issue: 1
eISSN: 1520-6300
ISSN: 1042-0533
DOI: 10.1002/ajhb.23052
Abstract: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.
Source: Scopus
Short-term resource allocation during extensive athletic competition.
Authors: Longman, D.P., Prall, S.P., Shattuck, E.C., Stephen, I.D., Stock, J.T., Wells, J.C.K. and Muehlenbein, M.P.
Journal: Am J Hum Biol
Volume: 30
Issue: 1
eISSN: 1520-6300
DOI: 10.1002/ajhb.23052
Abstract: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.
Source: PubMed
Short-term resource allocation during extensive athletic competition
Authors: Longman, D.P., Prall, S.P., Shattuck, E.C., Stephen, I.D., Stock, J.T., Wells, J.C.K. and Muehlenbein, M.P.
Journal: AMERICAN JOURNAL OF HUMAN BIOLOGY
Volume: 30
Issue: 1
eISSN: 1520-6300
ISSN: 1042-0533
DOI: 10.1002/ajhb.23052
Source: Web of Science (Lite)
Short-term resource allocation during extensive athletic competition.
Authors: Longman, D.P., Prall, S.P., Shattuck, E.C., Stephen, I.D., Stock, J.T., Wells, J.C.K. and Muehlenbein, M.P.
Journal: American journal of human biology : the official journal of the Human Biology Council
Volume: 30
Issue: 1
eISSN: 1520-6300
ISSN: 1042-0533
DOI: 10.1002/ajhb.23052
Abstract: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.Source: Europe PubMed Central