6,000IU/Day of Vitamin D3 "Could" Trigger Improvements in Aerobic Metabolism & Performance in Professional Rowers
|The study at hand was conducted with liquid vitamin D. Sincecaps and pills increase OHD levels effectively, it's yet unlikely that this explains the differences to other less successfull trials.|
I know that sounds kind of awkward without knowing what exactly the Polish scientists did. This is why I am going to give you a few more details below.
There are many ways to get your vitamin D learn more the SuppVersity
The same was true for most of the effects of the exercise regimen, which lead to significant increase in liver enzymes AspAT (asparagine aminotransferase), GGTP (gamma-glutamyltransferase) and LDH (lactate dehydrogenase) which suggest that the applied training program, after its completion, improved the function of some organs such as liver, heart or kidneys - with slightly greater increases in enzymes activity in the vitamin D group.
|Figure 1: The vitamin D supplement added to the seasonal increase in vitamin D levels and increase the total antioxidant capacity of the rowers (Jastrzebski. 2014).|
In some, but not all subjects these changes went hand in hand with higher results of power and oxygen consumption obtained during a continuous graded exercise test in the vitamin D group. At the same time their blood parameters such as IL-1b, CRP, LDH reached lower values. As the author points out, "[t]he results suggest that vitamin D3, whose concentration in blood increased by 400% in GS as a result of supplementation, could be the reason for the improvement of aerobic metabolism in the rowers and reduction of their inflammatory reactions in response to the high-intensity training" (Jastrzebski. 2014) - a result that is quite surprising given the fact that the athletes were, unlike the subjects in previous studies with beneficial results, not vitamin D deficient at the onset of the study.
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- Dubnov-Raz, G., et al. "Vitamin D Supplementation and Physical Performance in Adolescent Swimmers." International journal of sport nutrition and exercise metabolism (2014).
- Jastrzębski, Zbigniew. "Effect Of Vitamin D Supplementation On The Level Of Physical Fitness And Blood Parameters Of Rowers During The 8-Week High Intensity Training." Analele Universităţii din Oradea Facicula Educaţie Fizică şi Sport 2 (2014): 57 - 67