Healthday in US News Jan 2018
- “Nearly 60 percent of college football players have low levels of vitamin D. . . “
- “. . analysis that reviewed data on 214 college football players who'd taken part in the National Football League's so-called "scouting combine" in 2015”
- “. . 59 percent of the players had below-normal vitamin D levels. More than half of those who did — 56 percent — had sustained a relevant strain or injury during play.”
- “That figure went up to 73 percent among those with "severely deficient" vitamin D levels.”
- “By comparison, similar strains and injuries affected just 40 percent of players with normal vitamin D levels.”
- “And among the 14 players who had missed at least one game as a result of such targeted strains or injuries, 86 percent had low vitamin D levels.”
- “ . . 70 percent of black players had low vitamin D, compared with 13 percent of white players”
- Sports benefits from up to 50 ng of Vitamin – meta-analysis - Nov 2012
- Elite Athletes do well with weekly 35,000 IU of Vitamin D – RCT Feb 2017
- The USADA should ban vitamin D – July 2017
it is better than drugs for improving sports performance, and cannot be detected
- NHL discovers Vitamin D – underdog team paved the way 5 years before – 2016
- 4X fewer stress fractures in college athletes if more than 40 ng of vitamin D – Feb 2016
- Concussions (traumatic brain injury) getting big press coverage, vitamin D might be both a cause and a solution
Overview Sports and vitamin D has the following summary
Athletes are helped by vitamin D by:
- Faster reaction time
- Far fewer colds/flus during the winter
- Less sore/tired after a workout
- Fewer micro-cracks and broken bones
- Bones which do break heal much more quickly
- Increased VO2 and exercise endurance Feb 2011
- Indoor athletes especially need vitamin D
- Professional indoor athletes are starting to supplement with vitamin D or use vitamin D beds
- Olympic athletes have used UV/vitamin D since the 1930's
- The biggest gain from the use of vitamin D is by those who exercise less than 2 hours per day.
- Reduced muscle fatigue with 10,000 IU vitamin D daily
- Muscle strength improved when vitamin D added: 3 Meta-analysis
- Sports and Vitamin D category
HealthDay appears to have been referring the the following study
Download the PDF from Sci-Hub.tx viaVitaminDWiki
The Association of Vitamin D Status in Lower Extremity Muscle Strains and Core Muscle Injuries at the National Football League Combine
Arthroscopy, DOI: http://dx.doi.org/10.1016/j.arthro.2017.10.005
Brian J. Rebolledo, M.D.' M.D. Brian J. Rebolledo M.D. Brian J. Rebolledo, Johnathan A. Bernard, M.D., Brian C. Werner, M.D., Andrea K. Finlay, Ph.D., Benedict U. Nwachukwu, M.D., M.B.A., David M. Dare, M.D., Russell F. Warren, M.D., Scott A. Rodeo, M.D.
To evaluate the association between serum vitamin D level and the prevalence of lower extremity muscle strains and core muscle injuries in elite level athletes at the National Football League (NFL) combine.
During the 2015 NFL combine, all athletes with available serum vitamin D levels were included for study. Baseline data were collected, including age, race, body mass index, position, injury history specific to lower extremity muscle strain or core muscle injury, and Functional Movement Screen scores. Serum 25-hydroxyvitamin D was collected and defined as normal (≥32 ng/mL), insufficient (20-31 ng/mL), and deficient (<20 ng/mL). Univariate regression analysis was used to examine the association of vitamin D level and injury history. Subsequent multivariate regression analysis was used to examine this relation with adjustment for collected baseline data variables.
The study population included 214 athletes, including 78% African American athletes and 51% skilled position players. Inadequate vitamin D was present in 59%, including 10% with deficient levels. Lower extremity muscle strain or core muscle injury was present in 50% of athletes, which was associated with lower vitamin D levels (P = .03). Athletes with a positive injury history also showed significantly lower vitamin D levels as compared with uninjured athletes (P = .03). African American/black race (P < .001) and injury history (P < .001) was associated with lower vitamin D. Vitamin D groups showed no differences in age (P = .9), body mass index (P = .9), or Functional Movement Screen testing (P = .2). Univariate analysis of inadequate vitamin D levels showed a 1.86 higher odds of lower extremity strain or core muscle injury (P = .03), and 3.61 higher odds of hamstring injury (P < .001). Multivariate analysis did not reach an independent association of low vitamin D with injury history (P = .07).
Inadequate vitamin D levels are a widespread finding in athletes at the NFL combine. Players with a history of lower extremity muscle strain and core muscle injury had a higher prevalence of inadequate vitamin D.
Level of Evidence: Level IV, retrospective study-case series.
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