Intensely exercising muscles (rats) increases their vitamin D reception capability.– Sept 2015

Acute resisitance exercise increased VDR activation for a few hours - Sept 2015

Acute bout of resistance exercise increases vitamin D receptor protein expression in rat skeletal muscle

Yuhei Makanae1, Riki Ogasawara2, Koji Sato3, Yusuke Takamura3, Kenji Matsutani3, Kohei Kido3, Naruhiro Shiozawa3, Koichi Nakazato4 andSatoshi Fujita3,*
Experimental Physiology. DOI: 10.1113/EP085207

Vitamin D and vitamin D receptor (VDR) are involved in maintaining skeletal muscle mass and function. Although resistance exercise is well known to enhance muscle growth and improve muscle function, the effect of resistance exercise on VDR has been unclear. We investigated intramuscular VDR expression in response to an acute bout of resistance exercise and endurance exercise. Male adult Sprague-Dawley rats were subjected to either resistance exercise (isometrically exercised via percutaneous electrical stimulation for 5 sets of ten 3-s contractions, with a 7-s interval between contractions and 3-min rest intervals between sets) or endurance exercise (treadmill at 25 m min−1 for 60 min). Rats were killed immediately or 1, 3, 6, or 24 h after completion of the resistance or endurance exercise, and gastrocnemius muscles were removed. Non-exercise control animals were killed in a basal state (control group). Intramuscular VDR expression was significantly higher immediately after resistance exercise and elevated for 3 h after exercise compared with the control group (P < 0.05), and the resistance exercise significantly increased phosphorylated ERK1/2 and Mnk1 expression (P < 0.05), which may be associated with VDR expression, immediately after exercise. Additionally, intramuscular cytochrome P450 27B1 expression, an enzyme related to vitamin D metabolism, was significantly higher at 1 and 3 h after exercise (P < 0.05) compared with the control group. In contrast, endurance exercise had no effect on any of the measured proteins. Our results indicate that resistance exercise may be an efficient way to increase intramuscular VDR and related enzyme expression.

14 citations of article by April 2019

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See also Vitamin D Life

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• Resveratol helps vitamin D bind to cells – Dec 2014
• Role of Vitamin D in human Diseases and Disorders – An Overview – DBP, VDR June 2014
• Vitamin D supplementation improves muscle strength in healthy adults – meta-analysis of 6 RCT Aug 2014
• Vitamin D Receptor category listing has 76 items along with related searches
• Sports category listing has 231 items along with related searches
• Overview Sports and vitamin D has the following summary

Athletes are helped by vitamin D by:

1. Faster reaction time
2. Far fewer colds/flus during the winter
3. Less sore/tired after a workout
4. Fewer micro-cracks and broken bones
5. Bones which do break heal much more quickly
6. Increased VO2 and exercise endurance Feb 2011
7. Indoor athletes especially need vitamin D
8. Professional indoor athletes are starting to take vitamin D and/or use UV beds
9. Olympic athletes have used UV/vitamin D since the 1930's
10. The biggest gain from the use of vitamin D is by those who exercise less than 2 hours per day.
11. Reduced muscle fatigue with 10,000 IU vitamin D daily
12. Muscle strength improved when vitamin D added: 3 Meta-analysis
13. Reduced Concussions
    See also: Sports and Vitamin D category 231 items

Pages listed in BOTH of the categories Vitamin D Receptor and Sports

High intensity exercise increased VDR and Vitamin D in 6 ponies - Sept 2020

A single bout of high-intensity exercise modulates the expression of vitamin D receptor and vitamin D-metabolising enzymes in horse skeletal muscle doi: 10.1111/evj.13346

Background: The expressions of vitamin D receptor (VDR) and vitamin D-metabolising enzymes (CYP27B1 and CYP24A1) in skeletal muscle have been reported. However, the regulation of this vitamin D system in horse skeletal muscle after high-intensity exercise has not yet been elucidated.

Objectives: To investigate the effect of high-intensity exercise on the expression of vitamin D system-related proteins in horse skeletal muscle and its associations to skeletal muscle stem cell (SMSC) activity and serum 25(OH)D level.

Study design: Longitudinal study.

Methods: Six healthy ponies (5 geldings, 1 mare; age 6.3 ± 2.2 years) were studied. Serum and muscle samples were taken from the jugular vein and gluteus medius, respectively. Samples were collected at pre-exercise, post-exercise, 1 week, and 3 weeks after a single bout of high-intensity exercise. Protein expression levels of VDR, CYP27B1, CYP24A1, OxPhos, and Pax7 (SMSC marker) were determined using immunohistochemical analysis. Oxidative capacity and intramuscular glycogen content were evaluated using histochemical analysis. Blood biochemistry was analysed for lactate concentration and creatine kinase (CK), and 25(OH)D activity.

Results: High-intensity exercise significantly upregulated Pax7 and VDR protein expression, which correlated with significantly increased blood lactate and serum CK levels immediately post-exercise. Serum 25(OH)D2 level correlated with CYP27B1 protein expression in skeletal muscle, and it reduced significantly immediately post-exercise and at 1 week and 3 weeks post-exercise. However, CYP24A1 protein expression was unchanged throughout study periods.

Main limitation: The healthy ponies could not represent a fit population of racehorses and eventers.

Conclusions: The rapid increase in Pax7 and VDR protein expression along with serum CK level after high-intensity exercise demonstrated an association between SMSC activity and activation of the vitamin D system in response to muscle injury in horses. Moreover, a decrease in CYP27B1 protein expression, correlated with a reduction of serum 25(OH)D2 , may indicate a compromised vitamin D metabolism after high-intensity exercise.

Acute high intensity interval exercise reduces colon cancer cell growth - April 2019

No mention of Vitamin D Receptor
Physical activity is associated with significant reductions in colorectal cancer mortality. However, the mechanisms by which exercise mediates this anti‐oncogenic effect are not clear. In the present study, colorectal cancer survivors completed acute (n = 10) or chronic (n = 10) exercise regimes. An acute high intensity interval exercise session (HIIE; 4 × 4 min at 85–95% peak heart rate) was completed with serum samples collected at baseline, as well as 0 and 120 min post‐exercise. For the ‘chronic’ intervention, resting serum was sampled before and after 4 weeks (12 sessions) of HIIE. The effect of serum on colon cancer cell growth was evaluated by incubating cells (CaCo‐2 and LoVo) for up to 72 h and assessing cell number. Serum obtained immediately following HIIE, but not 120 min post‐HIIE, significantly reduced colon cancer cell number. Significant increases in serum interleukin‐6 (P = 0.023), interleukin‐8 (P = 0.036) and tumour necrosis factor‐α (P = 0.003) were found immediately following acute HIIE. At rest, short‐term HIIE training did not promote any changes in cellular growth or cytokine concentrations. The acute effects of HIIE and the cytokine flux may be important mediators of reducing colon cancer cell progression. Repetitive exposure to these acute effects may contribute to the relationship between exercise and improved colorectal cancer survival.
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