Colostrum Maintains Testosterone, Cortisol and Heart Rate Recovery, Where Whey Fails - During a Five Day Cycling Event With 10 Highly Trained Male Road Cyclists
|Legal gear fresh from the udder? If it works for cyclist, it must be real ;-)|
10g of whey vs. 10g of cholostrum "isolate"
The scientists from the School of Human Movement Studies recruited 10 highly trained cyclists with an average age of 22.5y and a body weight of ~70kg and put them on two different supplemental protocols
- the control group received consumed 10g whey protein concentrate (“Alacen® 80” Fonterra Co-op Group Limited, Auck- land, New Zealand) per day
- the colostrum group consumed 10 g Intact® bovine CPC (Numico Research Australia Pty Ltd, South Australia) per day
|Colostrum muscle builder or murky allergen (learn more)?|
Aside from the objectively measurable saliva responses, the scientists had the participants fill diet and training, as well as illness logs. The latter reflects the hypothesis that the IgG content in the colostrum would strengthen the immune system of the cyclists and should thus result in lowered infection rates. With two vs. four illnesses in the whole study period the differences between the colostrum (2 illnesses) and the whey group were yet statistically not significant.
|Figure 1: Change in heart rate recovery (left), salivary testosterone and cortisol levels (right) during the 5-day cycling event (Shing. 2013)|
|For short time-trials sodium bicarbonate may be the supp of choice (learn more).|
The scientists are yet right that "the present data support the potential for bovine CPC supplementation to maintain testosterone concentrations and influence heart rate variability response" in a training regimen that is notorious for its negative impact on the central nervous system and the HPTA. "Support" and "potential" - not more, but not less either.
- Shing CM, Peake JM, Suzuki K, Jenkins DG, Coombes JS. A pilot study: bovine colostrum supplementation and hormonal and autonomic responses to competitive cycling. J Sports Med Phys Fitness. 2013 Oct;53(5):490-501.