Association with physical fitness, serum hormones and sleep during a 15-day military field training

Tyyskä, Jarno; Kokko, Juha P.; Salonen, Mika; Koivu, Mikko; Kyröläinen, Heikki

doi:10.1016/j.jsams.2009.04.005

Cited by 20 publications

(21 citation statements)

References 17 publications

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“…It remains to be investigated whether improved sleeping patterns restore semen quality. In a recent study, Leproult and Van Cauter (6) restricted sleep among 10 young men for 1 week and reported a 10%-15% decrease in serum testosterone levels during the daytime-findings which are in line with other studies of young military personal (20)(21)(22). Penev (23) reported an association between longer sleep duration, as measured in a laboratory, and higher testosterone levels in 12 elderly men.…”

Section: Discussionsupporting

confidence: 63%

Association of Sleep Disturbances With Reduced Semen Quality: A Cross-sectional Study Among 953 Healthy Young Danish Men

Jensen¹,

Andersson²,

Skakkebæk³

et al. 2013

American Journal of Epidemiology

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Several studies have found an association between sleep duration and morbidity and mortality, but no previous studies have examined the association between sleep disturbances and semen quality. We conducted a cross-sectional study among 953 young Danish men from the general population who were recruited in Copenhagen at the time of determination of fitness for military service between January 2008 and June 2011. All of the men delivered a semen sample, had a blood sample drawn, underwent a physical examination, and answered a questionnaire including information about sleep disturbances. Sleep disturbances were assessed on the basis of a modified 4-item version of the Karolinska Sleep Questionnaire, which includes questions on sleep patterns during the past 4 weeks. Sleep disturbances showed an inverse U-shaped association with sperm concentration, total sperm count, percent motile and percent morphologically normal spermatozoa, and testis size. Men with a high level of sleep disturbance (score >50) had a 29% (95% confidence interval: 2, 48) lower adjusted sperm concentration and 1.6 (95% confidence interval: 0.3, 3.0) percentage points' fewer morphologically normal spermatozoa than men with a sleep score of 11-20. This appears to be the first study to find associations between sleep disturbances and semen quality. In future studies, investigators should attempt to elucidate mechanistic explanations and prospectively assess whether semen quality improves after interventions restoring a normal sleeping pattern.

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Section: Discussionsupporting

confidence: 63%

Association of Sleep Disturbances With Reduced Semen Quality: A Cross-sectional Study Among 953 Healthy Young Danish Men

Jensen¹,

Andersson²,

Skakkebæk³

et al. 2013

American Journal of Epidemiology

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“…Specifically, aerobic fitness has been associated with attenuated hormonal and subjective stress reactivity in response to military training. 48,49 Importantly in a military context, aerobic training helps to moderate reactivity to psychological stressors, in the absence of physical stress. Furthermore, evidence indicates that aerobic training can help to attenuate age-related increases in the hypothalamic-pituitary-adrenal axis reactivity to psychological stress.…”

Section: Women Are More Resilient (Tara Reilly Canada)mentioning

confidence: 99%

Perspectives on resilience for military readiness and preparedness: Report of an international military physiology roundtable

Nindl

Billing

Drain

et al. 2018

Journal of Science and Medicine in Sport

110

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Modern warfare operations often occur in volatile, uncertain, complex, and ambiguous (VUCA) environments accompanied by physical exertion, cognitive overload, sleep restriction and caloric deprivation. The increasingly fast-paced nature of these operations requires military personnel to demonstrate readiness and resiliency in the face of stressful environments to maintain optimal cognitive and physical performance necessary for success. Resiliency, the capacity to overcome the negative effects of setbacks and associated stress on performance, is a complex process involving not only an individual's physiology and psychology, but the influence of factors such as sex, environment, and training. The purpose of this moderated roundtable was to address five key domains of resiliency in a point/counterpoint format: physiological versus psychological resiliency, sex differences, contributions of aerobic and strength training, thermal tolerance, and the role of nature versus nurture. Each speaker was given three minutes to present and the moderator facilitated questions and discussion following the panel's presentation. The interconnectedness of the five domains highlights the need for an interdisciplinary approach to understand and build resilience to enhance military performance.

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“…Positive emotional states on the other hand, will increase testosterone production [118]. Sleep deprivation has also been shown to cause low testosterone levels [119].…”

Section: Sexual Dysfunction and Psychological Healthmentioning

confidence: 99%

Men’s Health: Sexual Dysfunction, Physical, and Psychological Health—Is There a Link?

Tan

Tong

2012

The Journal of Sexual Medicine

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Introduction Sexual dysfunction in men, such as erectile dysfunction, hypogonadism, and premature ejaculation, generates considerable attention. Its association with physical and psychological health is an issue which should be addressed seriously. Aim A review of the literature pertaining to the correlation between sexual dysfunction and physical and psychological health. Methods PubMed search for relevant publications on the association between sexual dysfunction in men and physical and psychological health. Main Outcome Measure Clinical and epidemiological evidence that demonstrates the association between sexual dysfunction in men and physical and psychological health. Results Sexual dysfunction, i.e., erectile dysfunction, hypogonadism, and premature ejaculation, has been shown to be associated with physical and psychological health. There is a strong correlation between sexual dysfunction and cardiovascular disease, metabolic syndrome, quality of life, and depression. Conclusion The association between men’s sexual dysfunction and physical and psychological health is real and proven. Therefore, it should not be taken lightly but instead treated as a life-threatening medical problem.

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Association with physical fitness, serum hormones and sleep during a 15-day military field training

Cited by 20 publications

References 17 publications

Association of Sleep Disturbances With Reduced Semen Quality: A Cross-sectional Study Among 953 Healthy Young Danish Men

Association of Sleep Disturbances With Reduced Semen Quality: A Cross-sectional Study Among 953 Healthy Young Danish Men

Perspectives on resilience for military readiness and preparedness: Report of an international military physiology roundtable

Men’s Health: Sexual Dysfunction, Physical, and Psychological Health—Is There a Link?

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