The effects of acute alcohol consumption on recovery from a simulated rugby match
Journal of Sports Sciences Volume 30, Issue 3, 2012

In this study, we investigated the effects of acute post-exercise alcohol consumption on measures of physical performance, creatine kinase, and immunoendocrine function in the 48 h following a rugby game simulation. Ten male senior rugby union players completed a rugby game simulation after which they consumed either 1 g of alcohol per kilogram of body mass or a non-alcoholic control beverage. Agility, 15 m sprint, countermovement jump, and srummaging performance were assessed pre-simulation and 24 and 48 h post-simulation. White blood cell count, testosterone, cortisol, and creatine kinase were measured before the simulation and 30 min, 12, 24, 36, and 48 h after the simulation. One week after the first trial, participants completed the second simulation after which the other beverage was consumed. The acute consumption of alcohol after a rugby game simulation negatively affected countermovement jump performance in the days following the simulation (P = 0.028). No differences between treatments were observed for the other criterion measures made in this study. In conclusion, after 80 min of a simulated rugby game, the consumption of 1 g of alcohol per kg body mass negatively impacts lower body vertical power output. However, performance of tasks requiring repeated maximal muscular effort is not affected.

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http://www.julienvenesson.fr/2012/01/24/podcast-1-venesson-gundill-delavier/

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Effet de l’huile fixe de la nigelle (Nigella sativa L.) sur le profil des androgènes chez le rat male
  Phytothérapie Volume 9, Number 6, 338-342,
M. El Khasmi, A. Issaoub Allah, M. Farh, F. Riad, A. Safwate, N. El Abbadi and E. H. Tahri

Les extraits des graines de la nigelle sont largement utilisés dans la médecine traditionnelle. Nous avons étudié l’effet de l’huile fixe de la nigelle sur les taux plasmatiques de la testostérone (T), de l’hormone folliculostimulante (FSH), de l’hormone lutéinisante (LH) et sur le poids corporel et celui des organes reproducteurs chez le rat. Vingt rats mâles ont été divisés en deux groupes de dix: le groupe témoin et celui traité avec l’huile de la nigelle (0,5 ml/kg) par voie intrapéritonéale pendant 30 jours. Nos résultats ont montré que l’huile de la nigelle augmente significativement la masse des organes reproducteurs et les concentrations plasmatiques de la T, de la FSH et de la LH comparativement aux animaux témoins (p < 0,05). L’induction de la stéroïdogenèse observée pourrait être médiée par une activation de l’axe hypothalamohypophysogonadique.

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Pycnogeno supplementation improves cognitive function, attention and mental performance in students
Panminerva Med, 2011 Sept; 53(3 Suppl 1): 75-82.

In a study involving 53 healthy university students between the ages of 18 and 27 years, supplementation with French maritime pine bark extract (Pycnogenol(R)) for a period of 8 weeks was found to be associated with statistically significant improvements in cognitive function, specifically, improved sustained attention, memory, executive functions and mood ratings, as compared to controls who were not given Pycnogenol(R). The students were given university examinations, and results found that in those given Pycnogenol(R), students failed 7 tests out of 112 (6.25%), as compared to controls who failed 9 tests out of 84 (10.71%), and the average test score among those given Pycnogenol(R) was 26.1 as compared to 23.81 in controls. The authors conclude, “This study indicates a role for Pycnogenol to improve cognitive function in normal students.”

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Association between plasma 25-OH vitamin D and testosterone levels in men
Katharina Nimptsch                 Clinical Endocrinology

Objective:  A small randomized controlled trial suggested that vitamin D might increase the production of testosterone in men, which is supported by experimental studies in animals and a cross-sectional study showing positive associations between plasma 25-hydroxyvitamin D [25(OH)D] and testosterone and concordant seasonal variation of both biomarkers.

Design and Measurements:  We investigated the cross-sectional association of plasma 25(OH)D levels and total and free testosterone measured by immunoassay in 1,362 male participants of the Health Professionals Follow-up Study who were selected for a nested case-control study on prostate cancer using multivariate adjusted linear and restricted cubic spline regression models.

Results:  25(OH)D was positively associated with total and free testosterone levels. From the lowest to the highest 25(OH)D quintile, multivariate adjusted means (95% confidence interval) were 18.5 (17.7; 19.4), 19.4 (18.6; 20.2), 19.6 (18.8; 20.4), 20.1 (19.3; 20.9) and 20.0 (19.1; 20.8); p-trend=0.003) for total testosterone and 97.7 (93.9; 101.5), 98.2 (94.1; 102.2), 99.2 (95.2; 103.2), 100.7 (96.9; 104.5) and 101.5 (97.6; 105.4; p-trend=0.03) for free testosterone. The shapes of the dose-response curves indicate that the association between 25(OH)D and total and free testosterone is linear at lower levels of 25(OH)D (below approximately 75-85 nmol/l), reaching a plateau at higher levels. Unlike for 25(OH)D, we did not observe any seasonal variation of testosterone concentrations.

Conclusion:  This study supports previously reported positive associations between vitamin D and testosterone although we did not observe parallel seasonal variation patterns. Possible causality and direction of the vitamin D-testosterone association deserve further scientific investigation.

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Aim:
Sprint exercise is characterized by repeated sessions of brief intermittent exercise at a high relative workload. However, little is known about the effect on mTOR pathway, an important link in regulation of muscle protein synthesis. An earlier training study showed a greater increase in muscle fibre cross sectional area in females than males. Therefore, we tested the hypothesis that activation of mTOR signalling is more pronounced in females than in males. Healthy males (n=9) and females (n=8) performed three bouts of 30-s sprint exercise with 20 min rest between.
Methods:
Multiple blood samples were collected over time and muscle biopsy specimens were obtained at rest and 140 min after the last sprint.
Results:
Serum insulin increased by sprint exercise and more so in females than in males (gender (g) x time (t):P=0.04. In skeletal muscle, phosphorylation of Akt increased by 50% (t, P=0.001) and mTOR by 120% (t, P=0.002) independent of gender. The elevation in p70S6k phosphorylation was larger in females (g x t, P=0.03) and averaged 230% (P=0.006) as compared to 60% in males (P=0.04). Phosphorylation rpS6 increased by 660% over time independent of gender (t, P=0.003). Increase in phosphorylation of p70S6k was directly related to increase in serum insulin (r=0.68, P=0.004).
Conclusion:
It is concluded that repeated 30-s all out bouts of sprint exercise separated by 20 min of rest, increases Akt/mTOR signalling in skeletal muscle. Secondly, signalling downstream of mTOR was stronger in females than in males after sprint exercise indicated by increased phosphorylation of p70S6k.

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