Reichrath J, Lehmann B, Carlberg C, Varani J, Zouboulis CC (2007) Vitamins as hormones. Horm Metab Res 39:71–84

Article  CAS  PubMed  Google Scholar 

Norman AW (2008) From vitamin D to hormone D: fundamentals of the vitamin D endocrine system essential for good health. Am J Clin Nutr 88:491S–499S

Article  CAS  PubMed  Google Scholar 

Okamura WH, Midland MM, Hammond MW, Abd Rahman N, Dormanen MC, Nemere I, Norman AW (1995) Chemistry and conformation of vitamin D molecules. J Steroid Biochem Mol Biol 53:603–613

Article  CAS  PubMed  Google Scholar 

Skalny AV, Aschner M, Tsatsakis A, Rocha JBT, Santamaria A, Spandidos DA, Martins AC, Lu R, Korobeinikova TV, Chen W, Chang JS, Chao JCJ, Li C, Tinkov AA (2024) Role of vitamins beyond vitamin D3 in bone health and osteoporosis (review). Int J Mol Med 53:9

Article  CAS  PubMed  Google Scholar 

Gottlieb DJ, Punjabi NM (2020) Diagnosis and management of obstructive sleep apnea: a review. JAMA 323:1389–1400

Article  PubMed  Google Scholar 

Yao N, Ma C, Dou R, Shen C, Yuan Y, Li W, Qu J (2024) Exploring the link between vitamin D deficiency and obstructive sleep apnea: a comprehensive review. J Sleep Res 27:e14166

Article  Google Scholar 

Dzik KP, Kaczor JJ (2019) Mechanisms of vitamin D on skeletal muscle function: oxidative stress, energy metabolism and anabolic state. Eur J Appl Physiol 119:825–839

Article  CAS  PubMed  PubMed Central  Google Scholar 

Wöbke TK, Sorg BL, Steinhilber D (2014) Vitamin D in inflammatory diseases. Front Physiol 5:244

PubMed  PubMed Central  Google Scholar 

Hughes DA, Norton R (2009) Vitamin D and respiratory health. Clin Exp Immunol 158:20–25

Article  CAS  PubMed  PubMed Central  Google Scholar 

Ferini-Strambi L, Lombardi GE, Marelli S, Galbiati A (2017) Neurological deficits in obstructive sleep apnea. Curr Treat Options Neurol 19:16

Article  PubMed  Google Scholar 

Haider F, Ghafoor H, Hassan OF, Farooqui K, Bel Khair AOM, Shoaib F (2023) Vitamin D and Cardiovascular diseases: an update. Cureus 15:e49734

PubMed  PubMed Central  Google Scholar 

McCarty DE, Chesson AL Jr, Jain SK, Marino AA (2014) The link between vitamin D metabolism and sleep medicine. Sleep Med Rev 18:311–319

Article  PubMed  Google Scholar 

Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, Mulrow CD, Shamseer L, Tetzlaff JM, Akl EA, Brennan SE, Chou R, Glanville J, Grimshaw JM, Hróbjartsson A, Lalu MM, Li T, Loder EW, Mayo-Wilson E, McDonald S, McGuinness LA, Stewart LA, Thomas J, Tricco AC, Welch VA, Whiting P, Moher D (2021) The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ 372:n71

Article  PubMed  PubMed Central  Google Scholar 

Methley AM, Campbell S, Chew-Graham C, McNally R, Cheraghi-Sohi S (2014) PICO, PICOS and SPIDER: a comparison study of specificity and sensitivity in three search tools for qualitative systematic reviews. BMC Health Serv Res 14:579

Article  PubMed  PubMed Central  Google Scholar 

Sterne JA, Hernán MA, Reeves BC, Savović J, Berkman ND, Viswanathan M, Henry D, Altman DG, Ansari MT, Boutron I, Carpenter JR, Chan AW, Churchill R, Deeks JJ, Hróbjartsson A, Kirkham J, Jüni P, Loke YK, Pigott TD, Ramsay CR, Regidor D, Rothstein HR, Sandhu L, Santaguida PL, Schünemann HJ, Shea B, Shrier I, Tugwell P, Turner L, Valentine JC, Waddington H, Waters E, Wells GA, Whiting PF, Higgins JP (2016) ROBINS-I: a tool for assessing risk of bias in non-randomised studies of interventions. BMJ 355:i4919

Article  PubMed  PubMed Central  Google Scholar 

Bozkurt NC, Cakal E, Sahin M, Ozkaya EC, Firat H, Delibasi T (2012) The relation of serum 25-hydroxyvitamin-D levels with severity of obstructive sleep apnea and glucose metabolism abnormalities. Endocrine 41:518–525

Article  CAS  PubMed  Google Scholar 

Mete T, Yalcin Y, Berker D, Ciftci B, Guven SF, Topaloglu O, Yavuz HC, Guler S (2013) Obstructive sleep apnea syndrome and its association with vitamin D deficiency. J Endocrinol Invest 36:681–685

CAS  PubMed  Google Scholar 

Kheirandish-Gozal L, Peris E, Gozal D (2014) Vitamin D levels and obstructive sleep apnoea in children. Sleep Med 15:459–463

Article  PubMed  PubMed Central  Google Scholar 

Erden ES, Genc S, Motor S, Ustun I, Ulutas KT, Bilgic HK, Oktar S, Sungur S, Erem C, Gokce C (2014) Investigation of serum bisphenol A, vitamin D, and parathyroid hormone levels in patients with obstructive sleep apnea syndrome. Endocrine 45:311–318

Article  CAS  PubMed  Google Scholar 

Liguori C, Romigi A, Izzi F, Mercuri NB, Cordella A, Tarquini E, Giambrone MP, Marciani MG, Placidi F (2015) Continuous Positive Airway Pressure Treatment Increases Serum Vitamin D Levels in male patients with obstructive sleep apnea. J Clin Sleep Med 11:603–607

Article  PubMed  PubMed Central  Google Scholar 

Liguori C, Izzi F, Mercuri NB, Romigi A, Cordella A, Tarantino U, Placidi F (2017) Vitamin D status of male OSAS patients improved after long-term CPAP treatment mainly in obese subjects. Sleep Med 29:81–85

Article  PubMed  Google Scholar 

Toujani S, Kaabachi W, Mjid M, Hamzaoui K, Cherif J, Beji M (2017) Vitamin D deficiency and interleukin-17 relationship in severe obstructive sleep apnea-hypopnea syndrome. Ann Thorac Med 12:107–113

Article  CAS  PubMed  PubMed Central  Google Scholar 

Archontogeorgis K, Nena E, Papanas N, Zissimopoulos A, Voulgaris A, Xanthoudaki M, Manolopoulos V, Froudarakis M, Steiropoulos P (2018) Vitamin D levels in Middle-aged patients with obstructive sleep apnoea syndrome. Curr Vasc Pharmacol 16:289–297

Article  CAS  PubMed  Google Scholar 

Pazarli AC, Ekiz T, İnönü Köseoğlu H (2019) Association between 25-Hydroxyvitamin D and bone mineral density in people with obstructive sleep apnea syndrome. J Clin Densitom 22:39–46

Article  PubMed  Google Scholar 

Sadaf S, Shameem M, Siddiqi SS, Anwar S, Mohd S (2021) Effect of obstructive sleep apnea on bone mineral density. Turk Thorac J 22:301–310

Article  PubMed  PubMed Central  Google Scholar 

Kotsiou OS, Siachpazidou DI, Pastaka C, Gogou E, Stavrou V, Kechagia M, Varsamas C, Hatzoglou C, Gourgoulianis KI (2022) Association between Interleukin-6 and vitamin D serum levels in patients with obstructive sleep apnea syndrome and impact of long-term continuous positive airway pressure therapy on biomarker levels. Respir Physiol Neurobiol 296:103806

Article  CAS  PubMed  Google Scholar 

Archontogeorgis K, Voulgaris A, Nena E, Zissimopoulos A, Bouloukaki I, Schiza SE, Steiropoulos P (2022) Vitamin D levels in patients with overlap syndrome, is it Associated with Disease Severity? J Pers Med 12:1693

Article  PubMed  PubMed Central  Google Scholar 

Anatolou D, Steiropoulos P, Zissimopoulos A, Chadia K, Archontogeorgis K, Kolios G, Manolopoulos VG, Ragia G (2024) Polymorphisms in LRP2 and CUBN genes and their association with serum vitamin D levels and sleep apnea. Sleep Breath 28:959–966

Article  PubMed  Google Scholar 

De Luca P, Di Stadio A, Marra P, Atturo F, Scarpa A, Cassandro C, La Mantia I, Della Volpe A, de Campora L, Tassone D, Camaioni A, Cassandro E (2023) Vitamin D deficit as inducer of adenotonsillar hypertrophy in children with obstructive sleep apnea-A prospective case-control study. Children 10:274

Article  PubMed  PubMed Central  Google Scholar 

Siachpazidou DI, Kotsiou OS, Stavrou V, Pastaka C, Gogou E, Kechagia M, Varsamas C, Economou NT, Zouridis S, Patrikioy E, Seitanidis G, Pinaka M, Sistou A, Hatzoglou C, Gourgoulianis KI (2021) Serum vitamin D levels in patients with obstructive sleep apnea syndrome and level changes after continuous positive airway pressure therapy. Sleep Breath 25:657–668

Article  PubMed  Google Scholar 

Kerley CP, Hutchinson K, Bolger K, McGowan A, Faul J, Cormican L (2016) Serum vitamin D is significantly inversely associated with disease severity in caucasian adults with obstructive sleep apnea syndrome. Sleep 39:293–300

Article