Abstract
Exposure to ovarian sex steroids during different life phases has long-term effects on women’s health and wellbeing. Menopause is characterized by rapid decline in ovarian sex steroids already during mid-life, between the ages of 46 and 52. Due to the menopause-related hormonal changes, women in most western countries live more than one-third of their lives in postmenopausal status. The role of ovarian steroids on neuromuscular function in middle-aged and older women has been investigated since the 1980s with increasing volume of research during the last decades. This review considers how different components of the neuromuscular system may be influenced by estrogens and so affects neuromuscular function in postmenopausal women. The main focus is on muscle strength and power, which are closely associated with mobility and functional capacity among older populations. In the end of the review, we summarize recent findings on the underlying biological mechanisms in skeletal muscle that could explain the association between hormone replacement therapy and neuromuscular function among postmenopausal women.
Similar content being viewed by others
References
Austad SN (2006) Why women live longer than men: sex differences in longevity. Gend Med 3:79–92
Lisko I, Tiainen K, Stenholm S, Luukkaala T, Hurme M, Lehtimaki T, Hervonen A, Jylha M (2012) Inflammation, adiposity, and mortality in the oldest old. Rejuvenation Res 15:445–452
Rannevik G, Jeppsson S, Johnell O, Bjerre B, Laurell-Borulf Y, Svanberg L (2008) A longitudinal study of the perimenopausal transition: altered profiles of steroid and pituitary hormones, SHBG and bone mineral density. Maturitas 61:67–77
Harlow SD, Gass M, Hall JE, Lobo R, Maki P, Rebar RW, Sherman S, Sluss PM, de Villiers TJ (2012) STRAW + 10 collaborative group executive summary of the stages of reproductive aging workshop + 10: addressing the unfinished agenda of staging reproductive aging. J Clin Endocrinol Metab 97:1159–1168
Schoenaker DA, Jackson CA, Rowlands JV, Mishra GD (2014) Socioeconomic position, lifestyle factors and age at natural menopause: a systematic review and meta-analyses of studies across six continents. Int J Epidemiol 43(5):1542–1562
Cheng S, Sipila S, Taaffe DR, Puolakka J, Suominen H (2002) Change in bone mass distribution induced by hormone replacement therapy and high-impact physical exercise in post-menopausal women. Bone 31:126–135
Mikkola TM, Heinonen A, Kovanen V, Cheng S, Kujala UM, Suominen H, Alen M, Puolakka J, Ankarberg-Lindgren C, Ronkainen PH, Koskenvuo M, Kaprio J, Rantanen T, Sipila S (2011) Influence of long-term postmenopausal hormone-replacement therapy on estimated structural bone strength: a study in discordant monozygotic twins. J Bone Miner Res 26:546–552
Finigan J, Gossiel F, Gluer CC, Felsenberg D, Reid DM, Roux C, Eastell R (2012) Endogenous estradiol and the risk of incident fracture in postmenopausal women: the OPUS study. Calcif Tissue Int 91:59–68
Behan M, Thomas CF (2005) Sex hormone receptors are expressed in identified respiratory motoneurons in male and female rats. Neuroscience 130:725–734
Srivastava DP, Penzes P (2011) Rapid estradiol modulation of neuronal connectivity and its implications for disease. Front Endocrinol (Lausanne) 2:77
Wiik A, Ekman M, Johansson O, Jansson E, Esbjornsson M (2009) Expression of both oestrogen receptor alpha and beta in human skeletal muscle tissue. Histochem Cell Biol 131:181–189
Bridgeman JT, Zhang Y, Donahue H, Wade AM, Juliano PJ (2010) Estrogen receptor expression in posterior tibial tendon dysfunction: a pilot study. Foot Ankle Int 31:1081–1084
Rantanen T, Guralnik JM, Foley D, Masaki K, Leveille S, Curb JD, White L (1999) Midlife hand grip strength as a predictor of old age disability. JAMA 281:558–560
Clark DJ, Pojednic RM, Reid KF, Patten C, Pasha EP, Phillips EM, Fielding RA (2013) Longitudinal decline of neuromuscular activation and power in healthy older adults. J Gerontol A Biol Sci Med Sci 68:1419–1425
Rantanen T, Harris T, Leveille SG, Visser M, Foley D, Masaki K, Guralnik JM (2000) Muscle strength and body mass index as long-term predictors of mortality in initially healthy men. J Gerontol A Biol Sci Med Sci 55:M168–M173
Johannesdottir F, Aspelund T, Siggeirsdottir K, Jonsson BY, Mogensen B, Sigurdsson S, Harris TB, Gudnason VG, Lang TF, Sigurdsson G (2012) Mid-thigh cortical bone structural parameters, muscle mass and strength, and association with lower limb fractures in older men and women (AGES-Reykjavik Study). Calcif Tissue Int 90:354–364
Prado CM, Baracos VE, McCargar LJ, Reiman T, Mourtzakis M, Tonkin K, Mackey JR, Koski S, Pituskin E, Sawyer MB (2009) Sarcopenia as a determinant of chemotherapy toxicity and time to tumor progression in metastatic breast cancer patients receiving capecitabine treatment. Clin Cancer Res 15:2920–2926
Delmonico MJ, Harris TB, Visser M, Park SW, Conroy MB, Velasquez-Mieyer P, Boudreau R, Manini TM, Nevitt M, Newman AB, Goodpaster BH, Health Aging, and Body (2009) Longitudinal study of muscle strength, quality, and adipose tissue infiltration. Am J Clin Nutr 90:1579–1585
Rantanen T, Masaki K, Foley D, Izmirlian G, White L, Guralnik JM (1998) Grip strength changes over 27 yr in Japanese-American men. J Appl Physiol (1985) 85:2047–2053
Bassey EJ, Fiatarone MA, O’Neill EF, Kelly M, Evans WJ, Lipsitz LA (1992) Leg extensor power and functional performance in very old men and women. Clin Sci (Lond) 82:321–327
Perry MC, Carville SF, Smith IC, Rutherford OM, Newham DJ (2007) Strength, power output and symmetry of leg muscles: effect of age and history of falling. Eur J Appl Physiol 100:553–561
Power GA, Makrakos DP, Stevens DE, Herzog W, Rice CL, Vandervoort AA (2014) Shortening-induced torque depression in old men: implications for age-related power loss. Exp Gerontol 57C:75–80
Korhonen MT, Cristea A, Alen M, Hakkinen K, Sipila S, Mero A, Viitasalo JT, Larsson L, Suominen H (2006) Aging, muscle fiber type, and contractile function in sprint-trained athletes. J Appl Physiol (1985) 101:906–917
Lexell J, Taylor CC, Sjostrom M (1988) What is the cause of the ageing atrophy? Total number, size and proportion of different fiber types studied in whole vastus lateralis muscle from 15- to 83-year-old men. J Neurol Sci 84:275–294
Goodpaster BH, Park SW, Harris TB, Kritchevsky SB, Nevitt M, Schwartz AV, Simonsick EM, Tylavsky FA, Visser M, Newman AB (2006) The loss of skeletal muscle strength, mass, and quality in older adults: the health, aging and body composition study. J Gerontol A Biol Sci Med Sci 61:1059–1064
Manini TM, Clark BC (2012) Dynapenia and aging: an update. J Gerontol A Biol Sci Med Sci 67:28–40
Goodpaster BH, Carlson CL, Visser M, Kelley DE, Scherzinger A, Harris TB, Stamm E, Newman AB (2001) Attenuation of skeletal muscle and strength in the elderly: the Health ABC Study. J Appl Physiol (1985) 90:2157–2165
Franchi M, Trire A, Quaranta M, Orsini E, Ottani V (2007) Collagen structure of tendon relates to function. ScientificWorldJournal 7:404–420
Finni T, Komi PV, Lepola V (2000) In vivo human triceps surae and quadriceps femoris muscle function in a squat jump and counter movement jump. Eur J Appl Physiol 83:416–426
Finni T, Ikegawa S, Lepola V, Komi PV (2003) Comparison of force-velocity relationships of vastus lateralis muscle in isokinetic and in stretch-shortening cycle exercises. Acta Physiol Scand 177:483–491
Kubo K, Kanehisa H, Fukunaga T (2001) Is passive stiffness in human muscles related to the elasticity of tendon structures? Eur J Appl Physiol 85:226–232
Couppe C, Hansen P, Kongsgaard M, Kovanen V, Suetta C, Aagaard P, Kjaer M, Magnusson SP (2009) Mechanical properties and collagen cross-linking of the patellar tendon in old and young men. J Appl Physiol (1985) 107:880–886
Stenroth L, Peltonen J, Cronin NJ, Sipila S, Finni T (2012) Age-related differences in Achilles tendon properties and triceps surae muscle architecture in vivo. J Appl Physiol (1985) 113:1537–1544
Zhou B, Zhou Y, Tang K (2014) An overview of structure, mechanical properties, and treatment for age-related tendinopathy. J Nutr Health Aging 18:441–448
Salat DH, Buckner RL, Snyder AZ, Greve DN, Desikan RS, Busa E, Morris JC, Dale AM, Fischl B (2004) Thinning of the cerebral cortex in aging. Cereb Cortex 14:721–730
Quiroz-Baez R, Flores-Dominguez D, Arias C (2013) Synaptic aging is associated with mitochondrial dysfunction, reduced antioxidant contents and increased vulnerability to amyloid-beta toxicity. Curr Alzheimer Res 10:324–331
Fujiyama H, Hyde J, Hinder MR, Kim SJ, McCormack GH, Vickers JC, Summers JJ (2014) Delayed plastic responses to anodal tDCS in older adults. Front Aging Neurosci 6:115
McNeil CJ, Doherty TJ, Stashuk DW, Rice CL (2005) Motor unit number estimates in the tibialis anterior muscle of young, old, and very old men. Muscle Nerve 31:461–467
Clark BC, Taylor JL (2011) Age-related changes in motor cortical properties and voluntary activation of skeletal muscle. Curr Aging Sci 4:192–199
Kobayashi H, Koyama Y, Enoka RM, Suzuki S (2014) A unique form of light-load training improves steadiness and performance on some functional tasks in older adults. Scand J Med Sci Sports 24:98–110
Vanden Noven ML, Pereira HM, Yoon T, Stevens AA, Nielson KA, Hunter SK (2014) Motor variability during sustained contractions increases with cognitive demand in older adults. Front Aging Neurosci 6:97
Phillips SK, Rook KM, Siddle NC, Bruce SA, Woledge RC (1993) Muscle weakness in women occurs at an earlier age than in men, but strength is preserved by hormone replacement therapy. Clin Sci (Lond) 84:95–98
Samson MM, Meeuwsen IB, Crowe A, Dessens JA, Duursma SA, Verhaar HJ (2000) Relationships between physical performance measures, age, height and body weight in healthy adults. Age Ageing 29:235–242
Hakkinen K, Kraemer WJ, Newton RU, Alen M (2001) Changes in electromyographic activity, muscle fibre and force production characteristics during heavy resistance/power strength training in middle-aged and older men and women. Acta Physiol Scand 171:51–62
Cauley JA, Petrini AM, LaPorte RE, Sandler RB, Bayles CM, Robertson RJ, Slemenda CW (1987) The decline of grip strength in the menopause: relationship to physical activity, estrogen use and anthropometric factors. J Chronic Dis 40:115–120
Maddalozzo GF, Cardinal BJ, Li F, Snow CM (2004) The association between hormone therapy use and changes in strength and body composition in early postmenopausal women. Menopause 11:438–446
Taaffe DR, Newman AB, Haggerty CL, Colbert LH, de Rekeneire N, Visser M, Goodpaster BH, Nevitt MC, Tylavsky FA, Harris TB (2005) Estrogen replacement, muscle composition, and physical function: the Health ABC Study. Med Sci Sports Exerc 37:1741–1747
Armstrong AL, Oborne J, Coupland CA, Macpherson MB, Bassey EJ, Wallace WA (1996) Effects of hormone replacement therapy on muscle performance and balance in post-menopausal women. Clin Sci (Lond) 91:685–690
Ronkainen PH, Kovanen V, Alen M, Pollanen E, Palonen EM, Ankarberg-Lindgren C, Hamalainen E, Turpeinen U, Kujala UM, Puolakka J, Kaprio J, Sipila S (2009) Postmenopausal hormone replacement therapy modifies skeletal muscle composition and function: a study with monozygotic twin pairs. J Appl Physiol (1985) 107:25–33
Rodrigues Barral AB, Nahas EA, Nahas-Neto J, Cangussu LM, Buttros Dde A (2012) Effect of hormone therapy on postural balance in postmenopausal women. Menopause 19:768–775
Heikkinen J, Kyllonen E, Kurttila-Matero E, Wilen-Rosenqvist G, Lankinen KS, Rita H, Vaananen HK (1997) HRT and exercise: effects on bone density, muscle strength and lipid metabolism. A placebo controlled 2-year prospective trial on two estrogen-progestin regimens in healthy postmenopausal women. Maturitas 26:139–149
Sipila S, Taaffe DR, Cheng S, Puolakka J, Toivanen J, Suominen H (2001) Effects of hormone replacement therapy and high-impact physical exercise on skeletal muscle in post-menopausal women: a randomized placebo-controlled study. Clin Sci (Lond) 101:147–157
Skelton DA, Phillips SK, Bruce SA, Naylor CH, Woledge RC (1999) Hormone replacement therapy increases isometric muscle strength of adductor pollicis in post-menopausal women. Clin Sci (Lond) 96:357–364
Onambele NG, Skelton DA, Bruce SA, Woledge RC (2001) Follow-up study of the benefits of hormone replacement therapy on isometric muscle strength of adductor pollicis in postmenopausal women. Clin Sci (Lond) 100:421–422
Ribom EL, Piehl-Aulin K, Ljunghall S, Ljunggren O, Naessen T (2002) Six months of hormone replacement therapy does not influence muscle strength in postmenopausal women. Maturitas 42:225–231
Hogervorst E (2013) Effects of gonadal hormones on cognitive behaviour in elderly men and women. J Neuroendocrinol 25:1182–1195
Suzuki S, Gerhold LM, Bottner M, Rau SW, Dela Cruz C, Yang E, Zhu H, Yu J, Cashion AB, Kindy MS, Merchenthaler I, Gage FH, Wise PM (2007) Estradiol enhances neurogenesis following ischemic stroke through estrogen receptors alpha and beta. J Comp Neurol 500:1064–1075
Finni T, Noorkoiv M, Pollanen E, Ronkainen PH, Alen M, Kaprio J, Kovanen V, Sipila S (2011) Muscle function in monozygotic female twin pairs discordant for hormone replacement therapy. Muscle Nerve 44:769–775
Qaisar R, Renaud G, Hedstrom Y, Pollanen E, Ronkainen P, Kaprio J, Alen M, Sipila S, Artemenko K, Bergquist J, Kovanen V, Larsson L (2013) Hormone replacement therapy improves contractile function and myonuclear organization of single muscle fibres from postmenopausal monozygotic female twin pairs. J Physiol 591:2333–2344
Carville SF, Rutherford OM, Newham DJ (2006) Power output, isometric strength and steadiness in the leg muscles of pre- and postmenopausal women; the effects of hormone replacement therapy. Eur J Appl Physiol 96:292–298
Taaffe DR, Sipila S, Cheng S, Puolakka J, Toivanen J, Suominen H (2005) The effect of hormone replacement therapy and/or exercise on skeletal muscle attenuation in postmenopausal women: a yearlong intervention. Clin Physiol Funct Imaging 25:297–304
Bosco C, Luhtanen P, Komi PV (1983) A simple method for measurement of mechanical power in jumping. Eur J Appl Physiol Occup Physiol 50:273–282
Bean JF, Kiely DK, LaRose S, Goldstein R, Frontera WR, Leveille SG (2010) Are changes in leg power responsible for clinically meaningful improvements in mobility in older adults? J Am Geriatr Soc 58:2363–2368
Kadi F, Karlsson C, Larsson B, Eriksson J, Larval M, Billig H, Jonsdottir IH (2002) The effects of physical activity and estrogen treatment on rat fast and slow skeletal muscles following ovariectomy. J Muscle Res Cell Motil 23:335–339
Laidlaw DH, Hunter SK, Enoka RM (2002) Nonuniform activation of the agonist muscle does not covary with index finger acceleration in old adults. J Appl Physiol (1985) 93:1400–1410
Elkabes S, Nicot AB (2014) Sex steroids and neuroprotection in spinal cord injury: a review of preclinical investigations. Exp Neurol 259:28–37
Suzuki S, Brown CM, Dela Cruz CD, Yang E, Bridwell DA, Wise PM (2007) Timing of estrogen therapy after ovariectomy dictates the efficacy of its neuroprotective and antiinflammatory actions. Proc Natl Acad Sci USA 104:6013–6018
Panay N, Hamoda H, Arya R, Savvas M, British Menopause Society and Women’s Health Concern (2013) The 2013 British Menopause Society & Women’s Health Concern recommendations on hormone replacement therapy. Menopause Int 19:59–68
Smith SS (1998) Estrous hormones enhance coupled, rhythmic olivary discharge in correlation with facilitated limb stepping. Neuroscience 82:83–95
Martin TA, Keating JG, Goodkin HP, Bastian AJ, Thach WT (1996) Throwing while looking through prisms. I. Focal olivocerebellar lesions impair adaptation. Brain 119(Pt 4):1183–1198
Farooque M, Suo Z, Arnold PM, Wulser MJ, Chou CT, Vancura RW, Fowler S, Festoff BW (2006) Gender-related differences in recovery of locomotor function after spinal cord injury in mice. Spinal Cord 44:182–187
Chaovipoch P, Jelks KA, Gerhold LM, West EJ, Chongthammakun S, Floyd CL (2006) 17beta-estradiol is protective in spinal cord injury in post- and pre-menopausal rats. J Neurotrauma 23:830–852
Sipski ML, Jackson AB, Gomez-Marin O, Estores I, Stein A (2004) Effects of gender on neurologic and functional recovery after spinal cord injury. Arch Phys Med Rehabil 85:1826–1836
Furlan JC, Krassioukov AV, Fehlings MG (2005) The effects of gender on clinical and neurological outcomes after acute cervical spinal cord injury. J Neurotrauma 22:368–381
Abate M, Schiavone C, Di Carlo L, Salini V (2014) Prevalence of and risk factors for asymptomatic rotator cuff tears in postmenopausal women. Menopause 21:275–280
Hansen M, Kongsgaard M, Holm L, Skovgaard D, Magnusson SP, Qvortrup K, Larsen JO, Aagaard P, Dahl M, Serup A, Frystyk J, Flyvbjerg A, Langberg H, Kjaer M (2009) Effect of estrogen on tendon collagen synthesis, tendon structural characteristics, and biomechanical properties in postmenopausal women. J Appl Physiol (1985) 106:1385–1393
Magnusson SP, Beyer N, Abrahamsen H, Aagaard P, Neergaard K, Kjaer M (2003) Increased cross-sectional area and reduced tensile stress of the Achilles tendon in elderly compared with young women. J Gerontol A Biol Sci Med Sci 58:123–127
Finni T, Kovanen V, Ronkainen PH, Pollanen E, Bashford GR, Kaprio J, Alen M, Kujala UM, Sipila S (2009) Combination of hormone replacement therapy and high physical activity is associated with differences in Achilles tendon size in monozygotic female twin pairs. J Appl Physiol (1985) 106:1332–1337
Moran AL, Warren GL, Lowe DA (2006) Removal of ovarian hormones from mature mice detrimentally affects muscle contractile function and myosin structural distribution. J Appl Physiol (1985) 100:548–559
Matthews J, Gustafsson JA (2003) Estrogen signaling: a subtle balance between ER alpha and ER beta. Mol Interv 3:281–292
Prossnitz ER, Barton M (2011) The G-protein-coupled estrogen receptor GPER in health and disease. Nat Rev Endocrinol 7:715–726
Pollanen E, Sipila S, Alen M, Ronkainen PH, Ankarberg-Lindgren C, Puolakka J, Suominen H, Hamalainen E, Turpeinen U, Konttinen YT, Kovanen V (2011) Differential influence of peripheral and systemic sex steroids on skeletal muscle quality in pre- and postmenopausal women. Aging Cell 10:650–660
McEwen BS (2001) Invited review: estrogens effects on the brain: multiple sites and molecular mechanisms. J Appl Physiol (1985) 91:2785–2801
Barros RP, Gustafsson JA (2011) Estrogen receptors and the metabolic network. Cell Metab 14:289–299
Pollanen E, Ronkainen PH, Suominen H, Takala T, Koskinen S, Puolakka J, Sipila S, Kovanen V (2007) Muscular transcriptome in postmenopausal women with or without hormone replacement. Rejuvenation Res 10:485–500
Ronkainen PH, Pollanen E, Alen M, Pitkanen R, Puolakka J, Kujala UM, Kaprio J, Sipila S, Kovanen V (2010) Global gene expression profiles in skeletal muscle of monozygotic female twins discordant for hormone replacement therapy. Aging Cell 9:1098–1110
Bolster DR, Jefferson LS, Kimball SR (2004) Regulation of protein synthesis associated with skeletal muscle hypertrophy by insulin-, amino acid- and exercise-induced signalling. Proc Nutr Soc 63:351–356
Pollanen E, Ronkainen PH, Horttanainen M, Takala T, Puolakka J, Suominen H, Sipila S, Kovanen V (2010) Effects of combined hormone replacement therapy or its effective agents on the IGF-1 pathway in skeletal muscle. Growth Horm IGF Res 20:372–379
Glass DJ (2005) Skeletal muscle hypertrophy and atrophy signaling pathways. Int J Biochem Cell Biol 37:1974–1984
Barbieri M, Bonafe M, Franceschi C, Paolisso G (2003) Insulin/IGF-I-signaling pathway: an evolutionarily conserved mechanism of longevity from yeast to humans. Am J Physiol Endocrinol Metab 285:E1064–E1071
Ahtiainen M, Pollanen E, Ronkainen PH, Alen M, Puolakka J, Kaprio J, Sipila S, Kovanen V (2012) Age and estrogen-based hormone therapy affect systemic and local IL-6 and IGF-1 pathways in women. Age (Dordr) 34:1249–1260
Olivieri F, Ahtiainen M, Lazzarini R, Pollanen E, Capri M, Lorenzi M, Fulgenzi G, Albertini MC, Salvioli S, Alen MJ, Kujala UM, Borghetti G, Babini L, Kaprio J, Sipila S, Franceschi C, Kovanen V, Procopio AD (2014) Hormone replacement therapy enhances IGF-1 signaling in skeletal muscle by diminishing miR-182 and miR-223 expressions: a study on postmenopausal monozygotic twin pairs. Aging Cell 13:850–861
Guller I, Russell AP (2010) MicroRNAs in skeletal muscle: their role and regulation in development, disease and function. J Physiol 588:4075–4087
Denley A, Cosgrove LJ, Booker GW, Wallace JC, Forbes BE (2005) Molecular interactions of the IGF system. Cytokine Growth Factor Rev 16:421–439
Ferrucci L, Penninx BW, Volpato S, Harris TB, Bandeen-Roche K, Balfour J, Leveille SG, Fried LP, Md JM (2002) Change in muscle strength explains accelerated decline of physical function in older women with high interleukin-6 serum levels. J Am Geriatr Soc 50:1947–1954
Turgeon JL, Carr MC, Maki PM, Mendelsohn ME, Wise PM (2006) Complex actions of sex steroids in adipose tissue, the cardiovascular system, and brain: insights from basic science and clinical studies. Endocr Rev 27:575–605
Pfeilschifter J, Koditz R, Pfohl M, Schatz H (2002) Changes in proinflammatory cytokine activity after menopause. Endocr Rev 23:90–119
O’Connor JC, McCusker RH, Strle K, Johnson RW, Dantzer R, Kelley KW (2008) Regulation of IGF-I function by proinflammatory cytokines: at the interface of immunology and endocrinology. Cell Immunol 252:91–110
Ahtiainen M, Alen M, Pollanen E, Pulkkinen S, Ronkainen PH, Kujala UM, Kaprio J, Sipila S, Kovanen V (2012) Hormone therapy is associated with better body composition and adipokine/glucose profiles: a study with monozygotic co-twin control design. Menopause 19:1329–1335
Sell H, Eckel J, Dietze-Schroeder D (2006) Pathways leading to muscle insulin resistance–the muscle–fat connection. Arch Physiol Biochem 112:105–113
Conflict of Interest
S. Sipilä, T. Finni, and V. Kovanen declare no conflict of interest.
Human and Animal Rights and Informed Consent
This article does not contain any studies with human or animal subjects performed by any of the authors.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sipilä, S., Finni, T. & Kovanen, V. Estrogen Influences on Neuromuscular Function in Postmenopausal Women. Calcif Tissue Int 96, 222–233 (2015). https://doi.org/10.1007/s00223-014-9924-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00223-014-9924-x