• 1
    Woitge HW, Scheidt-Nave C, Kissling C, Leidig-Bruckner G, Meyer K, Grauer A, Scharla SH, Ziegler R, Seibel MJ 1998 Seasonal variation of biochemical indexes of bone turnover: Results of a population-based study. J Clin Endocrinol Metab 83:6875.
  • 2
    Woitge HW, Knothe A, Witte K, Schmidt-Gayk H, Ziegler R, Lemmer B, Seibel MJ 2000 Circaannual rhythms and interactions of vitamin D metabolites, parathyroid hormone, and biochemical markers of skeletal homeostasis: A prospective study. J Bone Miner Res 15:24432450.
  • 3
    Patel R, Collins D, Bullock S, Swaminathan R, Blake GM, Fogelman I 2001 The effect of season and vitamin D supplementation on bone mineral density in healthy women: A double-masked crossover study. Osteoporos Int 12:319325.
  • 4
    Overgaard K, Nilas L, Johansen JS, Christiansen C 1988 Lack of seasonal variation in bone mass and biochemical estimates of bone turnover. Bone 9:285288.
  • 5
    Vanderschueren D, Gevers G, Dequeker J, Geusens P, Nijs J, Devos P, De Roo M, Bouillon R 1991 Seasonal variation in bone metabolism in young healthy subjects. Calcif Tissue Int 49:8489.
  • 6
    Zittermann A, Scheld K, Stehle P 1998 Seasonal variations in vitamin D status and calcium absorption do not influence bone turnover in young women. Eur J Clin Nutr 52:501506.
  • 7
    Rosen CJ, Morrison A, Zhou H, Storm D, Hunter SJ, Musgrave K, Chen T, Wei W, Holick MF 1994 Elderly women in northern New England exhibit seasonal changes in bone mineral density and calciotropic hormones. Bone Miner 25:8392.
  • 8
    Tsai KS, Hsu SH, Cheng JP, Yang RS 1997 Vitamin D stores of urban women in Taipei: Effect on bone density and bone turnover, and seasonal variation. Bone 20:371374.
  • 9
    Storm D, Eslin R, Porter ES, Musgrave K, Vereault D, Patton C, Kessenich C, Mohan S, Chen T, Holick MF, Rosen CJ 1998 Calcium supplementation prevents seasonal bone loss and changes in biochemical markers of bone turnover in elderly New England women: A randomized placebo-controlled trial. J Clin Endocrinol Metab 83:38173825.
  • 10
    Chapuy MC, Schott AM, Garnero P, Hans D, Delmas PD, Meunier PJ 1996 Healthy elderly French women living at home have secondary hyperparathyroidism and high bone turnover in winter. EPIDOS Study Group. J Clin Endocrinol Metab 81:11291133.
  • 11
    Douglas AS, Miller MH, Reid DM, Hutchison JD, Porter RW, Robins SP 1996 Seasonal differences in biochemical parameters of bone remodelling. J Clin Pathol 49:284289.
  • 12
    Hyldstrup L, McNair P, Jensen GF, Transbol I 1986 Seasonal variations in indices of bone formation precede appropriate bone mineral changes in normal men. Bone 7:167170.
  • 13
    Thomsen K, Eriksen EF, Jorgensen JC, Charles P, Mosekilde L 1989 Seasonal variation of serum bone GLA protein. Scand J Clin Lab Invest 49:605611.
  • 14
    Yonei T, Hagino H, Katagiri H, Kishimoto H 1999 Bone metabolic changes in Antarctic wintering team members. Bone 24:145150.
  • 15
    Webb AR, Pilbeam C, Hanafin N, Holick MF 1990 An evaluation of the relative contributions of exposure to sunlight and of diet to the circulating concentrations of 25-hydroxyvitamin D in an elderly nursing home population in Boston. Am J Clin Nutr 51:10751081.
  • 16
    Sherman SS, Hollis BW, Tobin JD 1990 Vitamin D status and related parameters in a healthy population: The effects of age, sex, and season. J Clin Endocrinol Metab 71:405413.
  • 17
    Bouillon RA, Auwerx JH, Lissens WD, Pelemans WK 1987 Vitamin D status in the elderly: Seasonal substrate deficiency causes 1, 25-dihydroxycholecalciferol deficiency. Am J Clin Nutr 45:755763.
  • 18
    Harris SS, Dawson-Hughes B 1998 Seasonal changes in plasma 25-hydroxyvitamin D concentrations of young American black and white women. Am J Clin Nutr 67:12321236.
  • 19
    Krall EA, Sahyoun N, Tannenbaum S, Dallal GE, Dawson-Hughes B 1989 Effect of vitamin D intake on seasonal variations in parathyroid hormone secretion in postmenopausal women. N Engl J Med 321:17771783.
  • 20
    Outila TA, Karkkainen MU, Seppanen RH, Lamberg-Allardt CJ 2000 Dietary intake of vitamin D in premenopausal, healthy vegans was insufficient to maintain concentrations of serum 25-hydroxyvitamin D and intact parathyroid hormone within normal ranges during the winter in Finland. J Am Diet Assoc 100:434441.
  • 21
    Hannon R, Eastell R 2000 Preanalytical variability of biochemical markers of bone turnover. Osteoporos Int 11(Suppl 6):S30S44.
  • 22
    Colwell A, Russell RG, Eastell R 1993 Factors affecting the assay of urinary 3-hydroxy pyridinium crosslinks of collagen as markers of bone resorption. Eur J Clin Invest 23:341349.
  • 23
    Nelson W, Tong YL, Lee JK, Halberg F 1979 Methods for cosinor-rhythmometry. Chronobiologia 6:305323.
  • 24
    Bergstralh EJ, Sinaki M, Offord KP, Wahner HW, Melton LJ III 1990 Effect of season on physical activity score, back extensor muscle strength, and lumbar bone mineral density. J Bone Miner Res 5:371377.
  • 25
    Krolner B 1983 Seasonal variation of lumbar spine bone mineral content in normal women. Calcif Tissue Int 35:145147.
  • 26
    Rico H, Revilla M, Cardenas JL, Villa LF, Fraile E, Martin FJ, Arribas I 1994 Influence of weight and seasonal changes on radiogrammetry and bone densitometry. Calcif Tissue Int 54:385388.
  • 27
    Dawson-Hughes B, Harris S 1992 Regional changes in body composition by time of year in healthy postmenopausal women. Am J Clin Nutr 56:307313.
  • 28
    Neer RM 1990 Effect of season on activity and bone mineral density. J Bone Miner Res 5:12711272.
  • 29
    Blumsohn A, Colwell A, Naylor K, Eastell R 1995 Effect of light and gamma-irradiation on pyridinolines and telopeptides of type I collagen in urine. Clin Chem 41:11951197.
  • 30
    Blumsohn A, Hannon RA, Eastell R 1995 Apparent instability of osteocalcin in serum as measured with different commercially available immunoassays. Clin Chem 41:318319.
  • 31
    Moriyama M, Saito H, Nakano A, Funaki S, Kojima S 1988 Estimation of urinary 24-hr creatinine excretion by body size and dietary protein level: A field survey based on seasonally repeated measurements for residents living in Akita, Japan. Tohoku J Exp Med 156:5563.
  • 32
    Touitou Y, Touitou C, Bogdan A, Reinberg A, Motohashi Y, Auzeby A, Beck H 1989 Circadian and seasonal variations of electrolytes in aging humans. Clin Chim Acta 180:245254.
  • 33
    Blumsohn A, Herrington K, Hannon RA, Shao P, Eyre DR, Eastell R 1994 The effect of calcium supplementation on the circadian rhythm of bone resorption. J Clin Endocrinol Metab 79:730735.
  • 34
    Nielsen HK, Brixen K, Mosekilde L 1990 Diurnal rhythm and 24-hour integrated concentrations of serum osteocalcin in normals: Influence of age, sex, season, and smoking habits. Calcif Tissue Int 47:284290.
  • 35
    Malabanan A, Veronikis IE, Holick MF 1998 Redefining vitamin D insufficiency. Lancet 351:805806.
  • 36
    Perry HM III, Horowitz M, Fleming S, Kaiser FE, Patrick P, Morley JE, Cushman W, Bingham S, Perry HM Jr 1999 The effects of season and alcohol intake on mineral metabolism in men. Alcohol Clin Exp Res 23:214219.
  • 37
    Walker BR, Best R, Noon JP, Watt GC, Webb DJ 1997 Seasonal variation in glucocorticoid activity in healthy men. J Clin Endocrinol Metab 82:40154019.
  • 38
    van der Wielen RP, Lowik MR, van den Berg H, de Groot LC, Haller J, Moreiras O, van Staveren WA 1995 Serum vitamin D concentrations among elderly people in Europe. Lancet 346:207210.