THE EFFECT OF HIGH DOSE VITAMIN D3 ON PHYSICAL PERFORMANCE IN FRAIL OLDER ADULTS. A FEASIBILITY STUDY

2018 ◽  
pp. 1-7
Author(s):  
N.W. BRAY ◽  
T.J. DOHERTY ◽  
M. MONTERO-ODASSO
Keyword(s):  
Older Adults ◽  
Vitamin D ◽  
Physical Performance ◽  
Feasibility Study ◽  
Vitamin D3 ◽  
Gait Speed ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
Short Physical Performance Battery ◽  
Vitamin D Levels

Background: Vitamin D deficiency is ubiquitous in frailty but the effectiveness of vitamin D supplementation to improve outcomes in frail individuals is unclear. It has been postulated that higher than the current recommended doses (800 IU/day) may be needed to achieve a neuromuscular effect in frail individuals. Objectives: 1) determine if 4000 IU per day of vitamin D3 is safe for frail older adults; and 2) establish the efficacy of this dose to improve physical performance outcomes in this population. Design: Open-label, feasibility study. Setting: Community retirement centre. Participants: 40 older adults with frail or pre-frail characteristics. Intervention: 4000 IU of vitamin D3 and 1200 mcg of calcium carbonate daily for four months. Measurements: Physical performance (grip strength, gait speed and short physical performance battery score), cognitive health and vitamin D and iPTH serum levels before and after the intervention. Results: Frail individuals improved short physical performance battery score (1.19, p = 0.005), fast gait speed (4.65, p = 0.066) and vitamin D levels (7.81, p = 0.011). Only frail females made a significant improvement in grip strength (1.92, p = 0.003). Stratifying the sample by baseline vitamin D levels revealed that participants with vitamin D insufficiency (≤ 75 nmol/L) significantly improved short physical performance battery score (1.06, p = 0.04), fast gait speed (6.28, p = 0.004) and vitamin D levels (25.73, p = <0.0001). Pre-frail individuals, as well as those with sufficient vitamin D levels (> 75 nmol/L) made no significant improvement in any outcome. Conclusions: Vitamin D supplementation using 4000 IU/daily is safe and has a modest beneficial effect on physical performance for frail individuals and those with insufficient vitamin D levels. Participants with vitamin D insufficiency (≤ 75 nmol/L) showed greater benefits. Our feasibility study provides results to help calculate effect size for a future RCT.

scholarly journals Circulating Levels of Muscle-Related Metabolites Increase in Response to a Daily Moderately High Dose of a Vitamin D3 Supplement in Women with Vitamin D Insufficiency—Secondary Analysis of a Randomized Placebo-Controlled Trial

Nutrients ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1310
Author(s):  
Lise Sofie Bislev ◽  
Ulrik Kræmer Sundekilde ◽  
Ece Kilic ◽  
Trine Kastrup Dalsgaard ◽  
Lars Rejnmark ◽  
...  
Keyword(s):  
Vitamin D ◽  
Muscle Strength ◽  
Physical Performance ◽  
Vitamin D3 ◽  
Controlled Trial ◽  
Secondary Analysis ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
High Dose ◽  
Negative Effects

Recently, we demonstrated negative effects of vitamin D supplementation on muscle strength and physical performance in women with vitamin D insufficiency. The underlying mechanism behind these findings remains unknown. In a secondary analysis of the randomized placebo-controlled trial designed to investigate cardiovascular and musculoskeletal health, we employed NMR-based metabolomics to assess the effect of a daily supplement of vitamin D3 (70 µg) or an identically administered placebo, during wintertime. We assessed the serum metabolome of 76 postmenopausal, otherwise healthy, women with vitamin D (25(OH)D) insufficiency (25(OH)D < 50 nmol/L), with mean levels of 25(OH)D of 33 ± 9 nmol/L. Compared to the placebo, vitamin D3 treatment significantly increased the levels of 25(OH)D (−5 vs. 59 nmol/L, respectively, p < 0.00001) and 1,25(OH)2D (−10 vs. 59 pmol/L, respectively, p < 0.00001), whereas parathyroid hormone (PTH) levels were reduced (0.3 vs. −0.7 pmol/L, respectively, p < 0.00001). Analysis of the serum metabolome revealed a significant increase of carnitine, choline, and urea and a tendency to increase for trimethylamine-N-oxide (TMAO) and urinary excretion of creatinine, without any effect on renal function. The increase in carnitine, choline, creatinine, and urea negatively correlated with muscle health and physical performance. Combined with previous clinical findings reporting negative effects of vitamin D on muscle strength and physical performance, this secondary analysis suggests a direct detrimental effect on skeletal muscle of moderately high daily doses of vitamin D supplements.

scholarly journals Vitamin D Levels in COVID-19 Outpatients from Western Mexico: Clinical Correlation and Effect of Its Supplementation

2021 ◽  
Vol 10 (11) ◽  
pp. 2378
Author(s):  
Gabriela Athziri Sánchez-Zuno ◽  
Guillermo González-Estevez ◽  
Mónica Guadalupe Matuz-Flores ◽  
Gabriela Macedo-Ojeda ◽  
Jorge Hernández-Bello ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D3 ◽  
Viral Infections ◽  
Serum Levels ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
Control Group ◽  
Serum Concentrations ◽  
Immunomodulatory Effects ◽  
Vitamin D Levels

Background: The immunomodulatory effects of vitamin D are known to be beneficial in viral infections; it is also known that its deficiency is associated with a prognosis more critical of Coronavirus Disease 2019. This study aimed to determine baseline vitamin D serum concentrations and the effects of its supplementation in asymptomatic or mildly symptomatic Coronavirus Disease 2019 outpatients. Methods: 42 outpatients were included, 22 of which received a supplement of 10,000 IU of vitamin D3 for 14 days; the remaining 20 outpatients were designated as a control group. Serum levels of transferrin, ferritin, vitamin D, and D-dimer were measured at baseline in both groups. After 14 days, serum levels of total vitamin D were determined in the supplemented group. Results: At baseline, only 19% of infected outpatients had vitamin D levels corresponding to sufficiency. All outpatients with vitamin D insufficiency had at least one symptom associated with the disease, while only 75% of patients with symptoms presented sufficiency. On the seventh and fourteenth day of follow-up, the supplemented group presented fewer symptoms with respect to those non-supplemented. A vitamin D3 dose of 10,000 IU/daily for 14 days was sufficient to raise vitamin D serum concentrations. Conclusions: Immunomodulatory effects of vitamin D appear to be linked to the development of symptoms in positive outpatients. Vitamin D supplementation could have significant benefits in the Western Mexican population.

Effects of Stratified Vitamin D Supplementation in Middle-Aged and Elderly Individuals with Vitamin D Insufficiency

2018 ◽  
Vol 50 (10) ◽  
pp. 747-753
Author(s):  
Yanhui Lu ◽  
Xiaomin Fu ◽  
Lili Zhang ◽  
Minyan Liu ◽  
Xiaoling Cheng ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Vitamin D3 ◽  
Intervention Group ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
Control Group ◽  
Middle Aged ◽  
Oral Vitamin ◽  
Severe Vitamin

AbstractThe incidence of vitamin D deficiency is high globally, and vitamin D supplementation draws particular attention. The objective of this study was to investigate the effects of stratified vitamin D supplementation in middle-aged and elderly individuals with vitamin D insufficiency in Beijing. A total of 448 subjects aged over 40 years old were selected from a community in Beijing. Among them, 100 middle-aged and elderly people with vitamin D insufficiency were randomly selected on a voluntary basis. They were further divided into control group and intervention group. The control group received health education and lifestyle guidance, and the intervention group received lifestyle guidance and vitamin D supplementation for nine months. The doses were stratified as follows: for vitamin D insufficiency, oral vitamin D3 supplement was given at 5000 IU/w; for mild vitamin D deficiency, oral vitamin D3 supplement was given at 10 000 IU/w; for severe vitamin D deficiency, oral vitamin D3 supplement was given at 15 000 IU/w. Safety evaluation was conducted after three-month treatment. The intervention group consisted of 8%, 62%, and 30% of cases who had vitamin D insufficiency, mild vitamin D deficiency, and severe vitamin D deficiency, respectively, which were similar with the control group. It showed that the blood 25(OH)D level increased significantly in the intervention group, from 14.30±4.30 ng/ml to 33.62±6.99 ng/ml (p<0.001), in contrast to insignificant change in the control group. Stratified vitamin D supplementation effectively increased the blood 25(OH)D level, as well as the number of cases with corrected vitamin D insufficiency or deficiency.

Vitamin D Supplementation Is Associated with a Reduction in Self-Reported Falls among Older Adults with Previous Fall History – Feasibility Study

2021 ◽  
pp. 1-7
Author(s):  
S.D. Anton ◽  
R.T. Mankowski ◽  
P. Qiu ◽  
L. You ◽  
B.A. Bensadon ◽  
...  
Keyword(s):  
Older Adults ◽  
Vitamin D ◽  
Handgrip Strength ◽  
Vitamin D Supplementation ◽  
Blood Levels ◽  
Timed Up And Go ◽  
Vitamin D Levels ◽  
Falls In Older Adults ◽  
One Year ◽  
The Impact

Background: Vitamin D insufficiency contributes to muscle weakness and a higher risk of falls in older adults. Objectives: This study explored the impact of vitamin D supplementation on self-reported falls and physical function in older adults with low vitamin D levels and a recent fall history. Materials and Methods: Twenty-five older adults ≥ 70 years with two or more falls during the past year, low vitamin D blood levels (≥10 ng/ml and < 30 ng/mL), and slow gait speed (1.2 m/s) participated in a 6-month vitamin D supplementation (800 IU/day) study. A modified version of the Morse Fall Scale questionnaire was used to assess frequency of falls over one-year prior to study enrollment. Functional outcomes (short physical performance battery, handgrip strength, gait Timed Up and Go, and six-minute walk), and vitamin D levels were assessed at baseline and 6-month follow-up. Results: Based on diaries and pill counts, participants were generally adherent to the intervention (6 of 7 days per week). Supplementation with 800 IU/day of vitamin D for 6 months increased blood vitamin D levels from 23.25±4.8 ng/ml to 29.13±6.9 ng/ml (p<0.001). Self-reported number of falls decreased from an average of 3.76 ± 2.2 falls in one-year to 0.76 ± 1.4 falls (p <0.0001) over the 6-month intervention. No changes in functional outcome measures were observed. Conclusions: Vitamin D supplementation at the currently recommended dose of 800 IU/day increased blood vitamin D levels and reduced frequency of falls in older adults with low vitamin D levels and a recent fall history.

117 Study of Development and Validation of the Multi-Sensor based Kiosk Performing Short Physical Performance Battery Automatically

2019 ◽  
Vol 48 (Supplement_4) ◽  
pp. iv28-iv33
Author(s):  
Heewon Jung ◽  
Jae-Young Lim ◽  
Jihong Park
Keyword(s):  
Older Adults ◽  
Physical Performance ◽  
Gait Speed ◽  
Physical Therapist ◽  
Short Physical Performance Battery ◽  
Standing Balance ◽  
Clinical Test ◽  
Chair Stand ◽  
Stand Test ◽  
Chair Stand Test

Abstract Background Short physical performance battery (SPPB) is a well-accepted clinical test to assess vulnerability in older adults. We aimed to develop and validate a multi-sensor based kiosk (e-SPPB kiosk) which can perform automated measurement for SPPB. Methods The e-SPPB kiosk was developed to measure 3 components of SPPB of standing balance, gait speed, and chair stand test with embedded sensors and algorithms. Feasibility and reliability of the e-SPPB kiosk was assessed with the manually measured SPPB (m-SPPB) by a physical therapist in participants aged 65 or older recruited from the outpatient rehabilitation clinic of the Seoul National University Bundang Hospital, Seongnam, Korea, from November 2018 to April 2019. Results In 34 participants with mean age of 73.6 (standard deviation [SD] 5.4), mean of e-SPPB total score was 10.1 (SD 2.2) and mean of m-SPPB total score was 10.2 (SD 2.3). Concordance between e-SPPB and m-SPPB total score was 0.94 (P&lt;0.001) and agreement by Kappa was 0.65 (P&lt;0.001). Agreements for components of e-SPPB and m-SPPB were 0.68 (P&lt;0.001), 0.73 (P&lt;0.001), 0.92 (P&lt;0.001) for standing balance, gait speed and chair stand test, respectively. Conclusion In older adults, physical performance measured by the e-SPPB kiosk correlated to m-SPPB measured by a single physical therapist. In multicenter studies for older people with physical performance as an outcome or selection criterion, e-SPPB kiosk can be used to reduce possible inter-rater variabilities of SPPB.

scholarly journals Suppression of Parathyroid Hormone as a Proxy for Optimal Vitamin D Status: Further Analysis of Two Parallel Studies in Opposite Latitudes

Nutrients ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 942 ◽  
Author(s):  
Marcela M. Mendes ◽  
Kathryn H. Hart ◽  
Susan A. Lanham-New ◽  
Patrícia B. Botelho
Keyword(s):  
Vitamin D ◽  
Parathyroid Hormone ◽  
Total Sample ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
Vitamin D Status ◽  
Low Latitude ◽  
Vitamin D Levels ◽  
Cubic Model ◽  
The Relationship

Optimal vitamin D status has commonly been defined as the level of 25-hydroxyvitamin D (25(OH)D) at which parathyroid hormone (PTH) concentrations would be maximally suppressed, represented by an observed minimum plateau. Previous findings indicate a large variation in this plateau, with values ranging from <30 nmol/L up to 100 nmol/L. This disparity in values might be explained by differences in study design and methodology, ethnicity, age, gender and latitude. This study aimed to investigate the concentration of 25(OH)D at which PTH concentrations were suppressed in Brazilian women living in opposite latitudes (high vs. low: i.e., UK and Brazil), during wintertime. Using data from the D-SOL study (Interaction between Vitamin D Supplementation and Sunlight Exposure in Women Living in Opposite Latitudes), the association between 25(OH)D status and PTH levels were examined in 135 Brazilian women (56 living in England and 79 living in Brazil, aged 20–59 years old). Mean PTH concentrations for Brazilian women with vitamin D deficiency (<25 nmol/L) were significantly higher compared to those with vitamin D insufficiency (25–49.9 nmol/L) (p < 0.01), vitamin D adequacy (50–74.9 nmol/L) (p < 0.01) and those with optimal vitamin D status (>75 nmol/L) (p < 0.001). Regression modelling was used to investigate the relationship between serum 25(OH)D and PTH for the sample as a whole and for each group separately. A cubic model was statistically significant for the total sample (p < 0.001), whereas a linear model presented the best fit for Brazilian women living in England (p = 0.04) and there were no statistically significant models fitted for Brazilian women living in Brazil. The cubic model suggests that 25(OH)D concentrations above 70–80 nmol/L are optimal to suppress the parathyroid gland in Brazilian women. These findings contribute to a better understanding of the relationship between 25(OH)D and PTH in populations living in a low latitude location and are of great relevance for discussions regarding the estimation of optimal cut-offs for vitamin D levels in the Brazilian population as well as for other low latitude locations.

Vitamin D Supplementation and Physical Performance in Adolescent Swimmers

2015 ◽  
Vol 25 (4) ◽  
pp. 317-325 ◽  
Author(s):  
Gal Dubnov-Raz ◽  
Netachen Livne ◽  
Raanan Raz ◽  
Avner H. Cohen ◽  
Naama W. Constantini
Keyword(s):  
Vitamin D ◽  
Physical Performance ◽  
Swimming Performance ◽  
Vitamin D Insufficiency ◽  
Sport Performance ◽  
Vitamin D Supplementation ◽  
Performance Variables ◽  
Hydroxyvitamin D ◽  
Before And After ◽  
25 Hydroxyvitamin D

It is hypothesized that vitamin D insufficiency in athletes might negatively affect sport performance. The objective of this study was to examine the effect of vitamin D3 supplementation on physical performance of adolescent swimmers with vitamin D insufficiency. Fifty-three adolescent competitive swimmers with vitamin D insufficiency (serum 25-hydroxyvitamin-D concentrations (25(OH)D)<30ng/ml, mean 24.2 ± 4.8ng/ml) were randomized to receive 2,000IU/day of vitamin D3 or placebo for 12 weeks. Swimming performance at several speeds, arm-grip strength, and one-legged balance, were measured before and after supplementation. The age-adjusted changes in performance variables during the study were compared between groups. 25(OH) D concentrations at study end were significantly higher in the vitamin group compared with the placebo group (29.6 ± 6.5ng/ml vs. 20.3 ± 4.2ng/ml, p < .001), yet only 48% of the vitamin group became vitamin D sufficient with this dosing. No between-group differences were found in the changes of the performance variables tested. No significant differences in performance were found between participants that became vitamin D sufficient, and those who did not. No significant correlation was found between the change in serum 25(OH)D and ageadjusted balance, strength or swimming performance at study end. Vitamin D3 supplementation that raised serum 25(OH)D concentrations by a mean of 9.3ng/ml above placebo in adolescent swimmers with vitamin D insufficiency, did not improve physical performance more than placebo.

scholarly journals Effect of Vitamin-D supplementation in adults presenting with chronic lower back pain

2020 ◽  
Vol 24 (2) ◽  
pp. 161-165
Author(s):  
Rahman Rasool Akhtar ◽  
Riaz Ahmed ◽  
Sabeen Ashraf ◽  
Omair Ashraf ◽  
Umer Shafique ◽  
...  
Keyword(s):  
Vitamin D ◽  
Back Pain ◽  
Pain Score ◽  
Lower Back Pain ◽  
Vitamin D3 ◽  
Vitamin D Supplementation ◽  
Chronic Lower Back Pain ◽  
Oral Vitamin ◽  
Lower Back ◽  
Vitamin D Levels

Background: Chronic pain in the lower back of adults is a common problem and mostly associated with Vitamin D deficiency. Along with standard treatment, vitamin D supplementation can help in early and better relief from back pain. Objective: To assess the effectiveness of vitamin D supplementation in patients with chronic lower back pain. Study Design & Methods: This Quasi-experimental trial was conducted at Department of Orthopaedics, Benazir Bhutto Hospital for 6 months. The patients aged between 15 to 55 years with chronic low back pain were included and pain score was noted by using a visual analogue scale (VAS). Patients were prescribed with oral vitamin D3 with a dose of 50,000 IU weekly for eight weeks (induction phase) and oral vitamin D3 with a dose of 50,000 IU once monthly for 6 months (maintenance phase). Outcome parameters included pain measured by VAS, functional disability by modified Oswestry disability questionnaire scores, and Vitamin-D3 levels at baseline,2, 3 and 6 months post-supplementation. Results: Mean age of patients was 44.21± 11.92 years.There were 337 (56.2%) male patients while 263 (43.8%) female patients. Baseline mean vitamin-D levels were 13.32 ± 6.10 ng/mL and increased to 37.18 ± 11.72 post supplementation (P < 0.0001). There was a significant decrease in the pain score after 2nd, 3rd& 6th months (61.7 ± 4.8, 45.2 ± 4.6 & 36.9 ± 7.9, respectively) than 81.2 ± 2.4 before supplementation (P < 0.001). The modified Oswestry disability score also showed significant improvement after 2nd, 3rd& 6thmonths (35.5 ± 11.4, 30.2 ± 9.4 & 25.8 ± 10.6, respectively) as compared to baseline 46.4 ± 13.2 (P < 0.001). About 418 (69.7%) patients attained normal levels after 6 months. Conclusion: Prescription of Vitamin D in addition to standard therapy for chronic lower back pain can be beneficial in getting relief from pain and improving the functional ability of the patient.

scholarly journals Vitamin D in athletes: focus on physical performance and musculoskeletal injuries

2021 ◽  
Vol 25 (2) ◽  
pp. 20-25
Author(s):  
Sewoon Yoon ◽  
Ohkyu Kwon ◽  
Jooyoung Kim
Keyword(s):  
Vitamin D ◽  
Physical Performance ◽  
Serum Vitamin ◽  
Serum Levels ◽  
Vitamin D Insufficiency ◽  
Musculoskeletal Injuries ◽  
Muscle Injuries ◽  
Negative Effects ◽  
Serum Vitamin D ◽  
Vitamin D Levels

[Purpose] The aim of this review was to discuss the effects of vitamin D on physical performance and musculoskeletal injuries in athletes and provide information on the field applications of vitamin D. [Methods] A systematic review was conducted to identify studies on vitamin D in athletes that assessed serum vitamin D levels, vitamin D and physical performance, vitamin D and musculoskeletal injuries, and practical guidelines for supplementation of vitamin D. [Results] Several studies reported that a high proportion of athletes had vitamin D insufficiency or deficiency. Low serum levels of vitamin D in athletes were more pronounced in winter than in other seasons, and indoor athletes had lower serum vitamin D levels than outdoor athletes. Low vitamin D levels have been demonstrated to have negative effects on muscle strength, power, and endurance; increase stress fractures and other musculoskeletal injuries; and affect acute muscle injuries and inflammation following high-intensity exercises. Therefore, periodic assessment and monitoring of vitamin D levels are necessary in athletes; the recommended serum level of 25(OH)D is > 32 ng/mL and the preferred level is > 40 ng/mL (-1). In those with low levels of vitamin D, exposure to sunlight and an improved diet or supplements may be helpful. Particularly, 2000–6000 IU of supplemental vitamin D3 can be consumed daily. [Conclusion] Vitamin D is a potential nutritional factor that can significantly affect physical performance and musculoskeletal injuries in athletes. The importance and role of vitamin D in athletes should be emphasized, and the current levels of vitamin D should be assessed. Therefore, it is essential to periodically evaluate and monitor serum vitamin D levels in athletes.

scholarly journals Vitamin D and Muscle Health: A Systematic Review and Metaanalysis of Randomized Placebo-Controlled Trials

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. A281-A281
Author(s):  
Lise Sofie Bislev ◽  
Diana Grove-Laugesen ◽  
Lars Rejnmark
Keyword(s):  
Vitamin D ◽  
Physical Performance ◽  
Vitamin D Insufficiency ◽  
Vitamin D Supplementation ◽  
Mean Difference ◽  
Controlled Trials ◽  
Inclusion Criteria ◽  
Randomized Controlled ◽  
Negative Effect ◽  
Muscle Health

Abstract Background: Data regarding effects of vitamin D on muscle function are inconsistent. Discrepancies between observational and placebo-controlled studies are an indisputable fact. Objective: To investigate effects of vitamin D supplementation vs placebo on muscle health. Data Sources: A systematic research of published randomized controlled trials published until October 2020 has been conducted on Medline, Cochrane Database of Systematics Reviews, Embase and Google Scholar. Study Selection: Participants treated with vitamin D2 or vitamin D3 supplementation vs placebo, with or without calcium co-supplementation. All studies despite administration form (daily, bolus and duration) and populations, except athletes, were included. The pre-defined end-points were maximum muscle strength (Newton) measured as handgrip, elbow flexion, elbow extension, knee flexion, and knee extension. Physical performance reported as Timed Up and Go test (s), Chair Rising Test (s), 6 minutes walking distance (m) and Standard Physical Performance Battery (points). Finally, muscle mass in term of total lean mass (kg) was included. As the end-point measures were standardized, we apriori used random model effects and mean difference. Data Synthesis: In total, 51 randomized controlled trials involving 7798 individuals were included. Of included studies, 14 studies included participants with vitamin D insufficiency (25(OH)D&lt;50 nmol/l) as inclusion criteria (19% of individuals). Outlier studies (N=1) were excluded. Analyses revealed a significant negative effect of vitamin D supplementation on knee flexion strength, mean difference -3.3 N, 95% CI (-6.63 to -0.03), I2=0%, n=765. The majority (8/12) of the studies used dosages &gt; 2800 IU/day. Time spend performing the TUG test was also significant longer in individuals treated with vitamin D as compared with placebo, mean difference at 0.15 s (95% CI 0.04 to 0.26), I2=0%, n=5175. Excluding studies using bolus therapy or daily dosages &gt; 2800 IU, the negative findings were no longer significant. No significant effect was found on the other measures of muscle strength, physical performance or muscle mass. In the minority of studies using vitamin D insufficiency as inclusion criteria, subgroup analysis revealed comparable effects of vitamin D and placebo. Conclusions: Overall, vitamin D do not have a beneficial effect on muscle health in non-athletes and may in some cases even have a negative effect. Subgroup analysis suggest that this finding may be dose-dependent. Our data do not support a beneficial effect on muscle health in vitamin D insufficient individuals, albeit only a minority of included studies investigated individuals suffering from vitamin D insufficiency. As an increasing number of studies report negative musculoskeletal effects including an increased fall risk, this study support the theory, that vitamin D should be dosed with care.

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