Amazoniac
Member
It's possible, to aid in repair:Thanks, Amazoniac.
In the two papers you've linked, positive correlation with the exercise intensity is found in serum and muscle, respectively. The "Mobilizing vitamin D..." paper suggests that the vitamin D is released due to lipolysis: "Exercise in the fasted or the fed state leads to an approximate twofold to threefold increase in adipose tissue lipolysis (Wolfe et al. 1990; Klein et al. 1994; Enevoldsen et al. 2004) and, when stored triacylglycerol is hydrolysed, vitamin D metabolites may also be released from the lipid droplet (Fig. 3)."
Given that lipolysis is baaa-d, I'll venture to say that the enhanced vit. D amounts in blood are to mitigate the harmful effects of lipolysis. What do you think?
To add to my point, the paper mentions that "..in vivo, as individuals with obesity display lower rates of lipolysis during exercise than lean controls (Stich et al. 2000; Mittendorfer et al. 2004). Whilst this may protect individuals with obesity from elevated circulating fatty acids (McQuaid et al. 2011), it may also contribute to sequestration of vitamin D. In support of this contention, adipose explants taken from individuals with obesity release less vitamin D when stimulated with lipolytic hormones than explants from lean controls (Di Nisio et al. 2017)." "there is a weak negative relationship between fat mass and circulating 1,25(OH)_2 D.", which is pro-inflammatory.
To sum up, keep your adipose-tissue vitamin D stores for a rainy day, do not exercise hard .
- A single bout of high‐intensity exercise modulates the expression of vitamin D receptor and vitamin D‐metabolising enzymes in horse skeletal muscle
(@tankasnowgod)
- Fasting and Exercise Induce Changes in Serum Vitamin D Metabolites in Healthy Men