Responsiveness of the reproductive axis to a single missed evening meal in young adult males

Trumble, Benjamin C.; Brindle, Eleanor; Kupsik, Michalina; O’Connor, Kathleen

doi:10.1002/ajhb.21079

Cited by 44 publications

(38 citation statements)

References 57 publications

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“…(a) Tsimane -United States salivary testosterone comparison Tsimane pre-competition saliva specimens (n ¼ 82) were compared with age-matched US saliva specimens (n ¼ 40) collected as controls during a non-competition study [27] to establish differences in baseline T levels. Tsimane male salivary T (182.9 pg ml No single position (forward, midfielder, defender, goalkeeper) had a statistically different T response when compared with other positions.…”

Section: Resultsmentioning

confidence: 99%

“…Saliva exhibiting blood contamination (n ¼ 22 specimens) [34], or inadequate volume (n ¼ 5 specimens) were excluded, leaving a total of 237 usable specimens from 82 individuals. Salivary T was measured via an in-house enzyme immunoassay [27] that cross-reacts 100 per cent with T, 57.4 per cent with 5-a-dihydrotestosterone, 0.27 per cent with androstenodione and less than 0.05 per cent with other androgens [35]. Specimens were run in duplicate, with each participant's samples run on the same plate to reduce bias owing to inter-plate variation.…”

Section: Methodsmentioning

confidence: 99%

“…Muscle tissue is calorically expensive to develop and maintain, particularly given that T increases fat catabolism [25]. In healthy industrialized males, reduced energetic availability from increased energy expenditure [26], or fasting [27] appears to reduce T through downregulation of the hypothalamicpituitary-gonadal axis. Parasitic and pathogenic stress [8,28,29] also downregulate T.…”

Section: Introductionmentioning

confidence: 99%

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Physical competition increases testosterone among Amazonian forager-horticulturalists: a test of the ‘challenge hypothesis’

et al. 2012

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The challenge hypothesis posits that acute increases in testosterone (T) during male-male competition enhance performance and survivability while limiting the physiological costs of consistently high T. Human challenge hypothesis research focuses on young men in industrial populations, who have higher baseline T levels than men in subsistence populations. We tested whether the Tsimane, pathogenically stressed forager-horticulturalists of the Bolivian Amazon, would express acute T increases in response to physical competition. Saliva was collected from 88 Tsimane men (aged 16-59 years) before and after a competitive soccer match. Tsimane men had significantly lower baseline levels of T (b ¼ 20.41, p , 0.001) when compared with age-matched United States (US) males. Linear mixed-effects models were used to establish that T increased significantly immediately following competition (b ¼ 0.23, p , 0.001), remaining high 1 h later (b ¼ 0.09, p ¼ 0.007); equivalent to 30.1 and 15.5 per cent increases in T, respectively. We did not find larger increases in T among winners (p ¼ 0.412), although T increases were positively associated with self-rated performance (b ¼ 9.07, p ¼ 0.004). These results suggest that despite lower levels of T than US males, Tsimane males exhibit acute increases in Tat the same relative magnitude reported by studies in industrialized settings, with larger increases in T for those who report better individual performance.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physical competition increases testosterone among Amazonian forager-horticulturalists: a test of the ‘challenge hypothesis’

et al. 2012

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“…, for instance, demonstrated that Honduran men upon diagnosis with malaria had lower testosterone than an uninfected comparison group, but that patients" testosterone rose steadily until equal to the comparison group over eight days of treatment with anti-malarial drugs. Likewise, other studies have reported declines in men"s testosterone after influenza vaccination (Simmons & Roney, 2009) and the day after missing only a single evening meal (Trumble et al, 2010).…”

Section: Accepted Manuscriptmentioning

confidence: 97%

Theoretical frameworks for human behavioral endocrinology

Roney

2016

Hormones and Behavior

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How can we best discover the ultimate, evolved functions of endocrine signals within the field of human behavioral endocrinology? Two related premises will guide my proposed answer. First, hormones typically have multiple, simultaneous effects distributed throughout the brain and body, such that in an abstract sense their prototypical function is the coordination of diverse outcomes. Second, coordinated output effects are often evolved, functional responses to specific eliciting conditions that cause increases or decreases in the relevant hormones. If we accept these premises, then a natural way to study hormones is to hypothesize and test how multiple eliciting conditions are mapped into coordinated output effects via hormonal signals. I will call these input-output mappings "theoretical frameworks." As examples, partial theoretical frameworks for gonadal hormones will be proposed, focusing on the signaling roles of testosterone in men and on estradiol and progesterone in women. Recent research on oxytocin in humans will also be considered as an example in which application of the theoretical framework approach could be especially helpful in making functional sense of the diverse array of findings associated with this hormone. The theoretical framework approach is not especially common in the current literature, with many theories having eschewed explicit consideration of input-output mappings in favor of parsimony-based arguments that attempt to find the one main thing that a hormone does with respect to psychology or behavior. I will argue that these parsimony-based models have many shortcomings, and conclude that the construction and testing of theoretical frameworks provides a better means of discovering the evolved functions of human endocrine signals.

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“…Males in better condition can afford higher levels of testosterone and the associated physiological costs; thus there is a wide range of testosterone levels within and between individuals [86,87]. Males in poor condition cannot maintain high levels of testosterone; illness and injury lead to rapid decreases in testosterone [88 -90], as does short and longer term fasting [91,92], and extensive energetic expenditure [93]. While some human and chimpanzee populations show no seasonal variation in testosterone [94,95], large studies of subsistence human and wild baboon populations report decreases in testosterone during leaner times [96,97].…”

Section: Testosterone Competition and Paternal Investmentmentioning

confidence: 99%

Evolving the neuroendocrine physiology of human and primate cooperation and collective action

Trumble¹,

Jaeggi²,

Gurven³

2015

Phil. Trans. R. Soc. B

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While many hormones play vital roles in facilitating or reinforcing cooperative behaviour, the neurohormones underlying competitive and cooperative behaviours are largely conserved across all mammals. This raises the question of how endocrine mechanisms have been shaped by selection to produce different levels of cooperation in different species. Multiple components of endocrine physiology—from baseline hormone concentrations, to binding proteins, to the receptor sensitivity and specificity—can evolve independently and be impacted by current socio-ecological conditions or individual status, thus potentially generating a wide range of variation within and between species. Here, we highlight several neurohormones and variation in hormone receptor genes associated with cooperation, focusing on the role of oxytocin and testosterone in contexts ranging from parenting and pair-bonding to reciprocity and territorial defence. While the studies reviewed herein describe the current state of the literature with regard to hormonal modulators of cooperation and collective action, there is still a paucity of research on hormonal mechanisms that help facilitate large-scale collective action. We end by discussing several potential areas for future research.

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Responsiveness of the reproductive axis to a single missed evening meal in young adult males

Cited by 44 publications

References 57 publications

Physical competition increases testosterone among Amazonian forager-horticulturalists: a test of the ‘challenge hypothesis’

Physical competition increases testosterone among Amazonian forager-horticulturalists: a test of the ‘challenge hypothesis’

Theoretical frameworks for human behavioral endocrinology

Evolving the neuroendocrine physiology of human and primate cooperation and collective action

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