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Minematsu A, Nishii Y. Effects of whole body vibration on bone properties in growing rats. Int Biomech 2022; 9:19-26. [DOI: 10.1080/23335432.2022.2142666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Akira Minematsu
- Department of Physical Therapy, Faculty of Health Science, Kio University, 4-2-2 Umaminaka, Koryo-cho, Kitakatsuragi-gun, 635-0832, Japan
| | - Yasue Nishii
- Department of Physical Therapy, Faculty of Health Science, Kio University, 4-2-2 Umaminaka, Koryo-cho, Kitakatsuragi-gun, 635-0832, Japan
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Chin KY, Ng BN, Rostam MKI, Muhammad Fadzil NFD, Raman V, Mohamed Yunus F, Syed Hashim SA, Ekeuku SO. A Mini Review on Osteoporosis: From Biology to Pharmacological Management of Bone Loss. J Clin Med 2022; 11:6434. [PMID: 36362662 PMCID: PMC9657533 DOI: 10.3390/jcm11216434] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 10/27/2022] [Accepted: 10/28/2022] [Indexed: 07/25/2023] Open
Abstract
Osteoporosis refers to excessive bone loss as reflected by the deterioration of bone mass and microarchitecture, which compromises bone strength. It is a complex multifactorial endocrine disease. Its pathogenesis relies on the presence of several endogenous and exogenous risk factors, which skew the physiological bone remodelling to a more catabolic process that results in net bone loss. This review aims to provide an overview of osteoporosis from its biology, epidemiology and clinical aspects (detection and pharmacological management). The review will serve as an updated reference for readers to understand the basics of osteoporosis and take action to prevent and manage this disease.
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Current Status of the Diagnosis and Management of Osteoporosis. Int J Mol Sci 2022; 23:ijms23169465. [PMID: 36012730 PMCID: PMC9408932 DOI: 10.3390/ijms23169465] [Citation(s) in RCA: 81] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/17/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022] Open
Abstract
Osteoporosis has been defined as the silent disease of the 21st century, becoming a public health risk due to its severity, chronicity and progression and affecting mainly postmenopausal women and older adults. Osteoporosis is characterized by an imbalance between bone resorption and bone production. It is diagnosed through different methods such as bone densitometry and dual X-rays. The treatment of this pathology focuses on different aspects. On the one hand, pharmacological treatments are characterized by the use of anti-resorptive drugs, as well as emerging regenerative medicine treatments such as cell therapies and the use of bioactive hydrogels. On the other hand, non-pharmacological treatments are associated with lifestyle habits that should be incorporated, such as physical activity, diet and the cessation of harmful habits such as a high consumption of alcohol or smoking. This review seeks to provide an overview of the theoretical basis in relation to bone biology, the existing methods for diagnosis and the treatments of osteoporosis, including the development of new strategies.
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De Landtsheer A, Bekaert L, David K, Marcq P, Jeandarme I, Decallonne B, Antonio L, Vanderschueren D. The impact of androgen deprivation therapy on bone mineral density in men treated for paraphilic disorder: A retrospective cohort study. Andrology 2021; 10:545-550. [PMID: 34914863 DOI: 10.1111/andr.13142] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/30/2021] [Accepted: 12/10/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND Guidelines suggest treating men with paraphilic disorder with androgen-deprivation therapy (ADT). However, little evidence is available about the long-term impact on bone loss and how to manage this adverse event. OBJECTIVES The aim of this study is to assess the impact of ADT on bone mineral density (BMD) in men treated for paraphilic disorder with the androgen receptor blocker cyproterone acetate (CPA) and/or GnRH agonist triptoreline (GnRHa) and to evaluate the effect of treatment with bisphosphonates. METHODS Baseline and follow-up dual-energy X-ray absorptiometry scan (DXA-scan) data (lumbar and femoral T-scores) were retrospectively extracted from electronic medical files of paraphilic men who received CPA and/or GnRHa. RESULTS A total of 53 patients with a mean age of 39.1 years (range 17.5-74.6) were included. Lumbar (-0.39 ± 0.17, Mean ± SEM, p = 0.046), femoral neck (-0.34 ± 0.09, p = 0.002) and total femur (-0.33 ± 0.12, p = 0.014) T-scores decreased significantly in the CPA-only group (n = 13) during a mean follow-up of 6.0 ± 5.3 years. In the GnRHa group (n = 29), T-scores at all sites decreased significantly over 6.6 ± 4.4 years (lumbar: -0.55 ± 0.12, p < 0.001, femoral neck: -0.53 ± 0.09, total femur: -0.44 ± 0.09, p < 0.001). In the group, who received bisphosphonates (n = 11), no significant T-score change was observed (lumbar: -0.25 ± 0.14, p = 0.106, femoral neck -0.15 ± 0.17, p = 0.402, total femur -0.25 ± 0.14, p = 0.106) during 5.0 ± 2.8 years of follow-up. DISCUSSION AND CONCLUSION Following a mean duration of 6 years of ADT, we observed a significant decline in BMD of approximately half a standard deviation in T-score at lumbar and femoral site. Although the number of patients who received bisphosphonates was limited, this treatment seems to have a positive stabilizing effect on bone density.
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Affiliation(s)
| | - Lieslinde Bekaert
- Department of Gynaecology, University Hospitals Leuven, Leuven, Belgium
| | - Karel David
- Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium.,Department of Clinical and Experimental Medicine, KU Leuven, Laboratory of Clinical and Experimental Endocrinology, Leuven, Belgium
| | - Philippe Marcq
- Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium
| | | | - Brigitte Decallonne
- Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium.,Department of Clinical and Experimental Medicine, KU Leuven, Laboratory of Clinical and Experimental Endocrinology, Leuven, Belgium
| | - Leen Antonio
- Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium.,Department of Clinical and Experimental Medicine, KU Leuven, Laboratory of Clinical and Experimental Endocrinology, Leuven, Belgium
| | - Dirk Vanderschueren
- Department of Endocrinology, University Hospitals Leuven, Leuven, Belgium.,Department of Clinical and Experimental Medicine, KU Leuven, Laboratory of Clinical and Experimental Endocrinology, Leuven, Belgium
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Tenforde AS, Roberts WO, Krabak BJ, Davis IS, Fredericson M, Luke AC, Ackerman KE. Recommendations to Optimize Health in Youth Runners. Strength Cond J 2020. [DOI: 10.1519/ssc.0000000000000504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Sympathetic skin response impairment: A good predictor of bone loss in electrical burn victims. Burns 2019; 46:394-399. [PMID: 31848086 DOI: 10.1016/j.burns.2019.07.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 04/18/2019] [Accepted: 07/23/2019] [Indexed: 01/22/2023]
Abstract
INTRODUCTION Burn victims are reported to have more possibility of bone loss in acute phase of injury partly due to sympathetic dysfunction and catecholamine increase beside other hypermetabolic responses. These patients are also prone to autonomic neuropathy and sympathetic skin response (SSR) impairment. We aim to investigate the correlation between SSR in the acute phase and bone mineral density (BMD) parameters in electrical burn patients and determine whether the SSR parameter in initial weeks of the event is a good predictor of bone loss in long term. MATERIALS AND METHODS Sixty two individuals exposed to low voltage(<1000 V) electrical current were invited to a cohort study. The SSR was recorded from their four limbs in 2-5 weeks after injury. Then, dual X-ray absorptiometry (DXA) was done to measure their BMD, T-score and Z -score, 9-12 months later. The correlation between SSR parameters in acute phase and DXA indexes was evaluated using Spearman test. A Roc curve was charted to point out a cut-off value for SSR amplitude and latency in respect to T-score to predict the subsequent bone loss. RESULT All the patients were male with a mean age of 34.09 years. Biphasic SSR parameters showed a significant correlation with lumbar BMD in a confidence interval of 99.9%. SSR amplitude threshold of 293.75 μV and latency of 2.15 s had a 100% sensitivity and 94% and 83% specificity respectively for predicting the bone loss (T-score<-1) in long term. The area under Roc curve was 0.94 and 0.99 in terms of SSR amplitude and latency. CONCLUSION SSR recorded in the first few weeks after electrical injury is a good predictor of bone loss in long term, so we recommend this test as a guide for screening the patients at risk for osteoporosis in electrical burn and formulating the preventive measurements.
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Minematsu A, Nishii Y, Imagita H, Sakata S. Possible effects of whole body vibration on bone properties in growing rats. Osteoporos Sarcopenia 2019; 5:78-83. [PMID: 31728424 PMCID: PMC6838745 DOI: 10.1016/j.afos.2019.07.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 07/03/2019] [Accepted: 07/31/2019] [Indexed: 01/23/2023] Open
Abstract
Objectives To examine the effects of whole body vibration (WBV) on bone properties in growing rats, and to explore the optimal conditions for enhancing bone properties. Methods Thirty-six 4-week-old male rats were divided into 1 control and 5 experimental groups. Each experimental group underwent WBV at 15, 30, 45, 60, and 90 Hz (0.5 g, 15 min/d, 5 d/wk) for 8 weeks. We measured bone size, muscle weight and bone mechanical strength of the right tibia. Trabecular bone mass and trabecular bone microstructure (TBMS) of the left tibia were analyzed by micro-computed tomography. Serum levels of bone formation/resorption markers were also measured. Results WBV at 45 Hz and 60 Hz tended to enhance trabecular bone mass and TBMS parameters. However, there was no difference in maximum load of tibias among all groups. Serum levels of bone resorption marker were significantly higher in the 45-Hz WBV group than in the control group. Conclusions WBV at 45–60 Hz may offer a potent modality for increasing bone mass during the period of rapid growth. Further studies are needed to explore the optimal WBV conditions for increasing peak bone mass and TBMS parameters. WBV modality may be a potent strategy for primary prevention against osteoporosis.
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Affiliation(s)
- Akira Minematsu
- Department of Physical Therapy, Faculty of Health Science, Kio University, Kitakatsuragi-gun, Japan
| | - Yasue Nishii
- Department of Physical Therapy, Faculty of Health Science, Kio University, Kitakatsuragi-gun, Japan
| | - Hidetaka Imagita
- Department of Physical Therapy, Faculty of Health Science, Kio University, Kitakatsuragi-gun, Japan
| | - Susumu Sakata
- Department of Physiology I, Nara Medical University, Kashihara, Japan
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Minett MM, Weidauer L, Wey HE, Binkley TL, Beare TM, Specker BL. Sports Participation in High School and College Leads to High Bone Density and Greater Rates of Bone Loss in Young Men: Results from a Population-Based Study. Calcif Tissue Int 2018; 103:5-15. [PMID: 29302709 DOI: 10.1007/s00223-017-0383-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 12/29/2017] [Indexed: 11/29/2022]
Abstract
Estimated lifetime risk of an osteoporotic fracture in men over the age of 50 years is substantial and lifestyle factors such as physical activity may explain variation in bone mass and bone loss associated with aging. Men (n = 253) aged 20-66 years were followed for 7.5 years and factors that influence changes in means and rates of change in bone mass, density, and size using dual-energy X-ray absorptiometry (DXA) and peripheral quantitative computed tomography (pQCT) were investigated; in particular, seasons of sports participation during high school and college. Men with greater sports participation had higher total hip bone mineral content (BMC) (48.4 ± 0.9 and 48.6 ± 0.9 g for 7-12 and 13+ seasons vs. 45.6 ± 0.8 and 45.4 ± 0.7 g for 0 and 1-6 seasons, respectively p < 0.05) and areal bone mineral density (aBMD) (1.082 ± 0.015 and 1.087 ± 0.015 g/cm2 for 7-12 and 13+ seasons vs. 1.011 ± 0.015 and 1.029 ± 0.013 g/cm2 for 0 and 1-6 seasons, respectively p < 0.05) than men who participated in less sport-seasons. However, men with higher sports participation also had greater rates of bone loss in their mid-twenties at the hip (BMC - 0.8 and - 1.2% and aBMD - 0.8 and - 0.9% for 7-12 and 13+ seasons of sport participation, respectively) compared to those with 0 seasons of sport participation (BMC - 0.6% and aBMD - 0.6%) (all p < 0.05). Similar results were observed for femoral neck aBMD. Men with 7+ seasons of sport participation had higher cross-sectional area at the 20% distal radius site than those with no sports participation (all p < 0.05). These findings support significant effects of high school and/or college sports participation on bone mass and geometry in men throughout adulthood.
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Affiliation(s)
- Maggie M Minett
- EA Martin Program, South Dakota State University, Box 506, Wecota Hall, Brookings, SD, 57007, USA.
| | - Lee Weidauer
- EA Martin Program, South Dakota State University, Box 506, Wecota Hall, Brookings, SD, 57007, USA
| | - Howard E Wey
- EA Martin Program, South Dakota State University, Box 506, Wecota Hall, Brookings, SD, 57007, USA
- College of Nursing, South Dakota State University, Brookings, SD, 57007, USA
| | - Teresa L Binkley
- EA Martin Program, South Dakota State University, Box 506, Wecota Hall, Brookings, SD, 57007, USA
| | - Tianna M Beare
- EA Martin Program, South Dakota State University, Box 506, Wecota Hall, Brookings, SD, 57007, USA
| | - Bonny L Specker
- EA Martin Program, South Dakota State University, Box 506, Wecota Hall, Brookings, SD, 57007, USA
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Abstract
With ageing, bone tissue undergoes significant compositional, architectural and metabolic alterations potentially leading to osteoporosis. Osteoporosis is the most prevalent bone disorder, which is characterised by progressive bone weakening and an increased risk of fragility fractures. Although this metabolic disease is conventionally associated with ageing and menopause, the predisposing factors are thought to be established during childhood and adolescence. In light of this, exercise interventions implemented during maturation are likely to be highly beneficial as part of a long-term strategy to maximise peak bone mass and hence delay the onset of age- or menopause-related osteoporosis. This notion is supported by data on exercise interventions implemented during childhood and adolescence, which confirmed that weight-bearing activity, particularly if undertaken during peripubertal development, is capable of generating a significant osteogenic response leading to bone anabolism. Recent work on human ageing and epigenetics suggests that undertaking exercise after the fourth decade of life is still important, given the anti-ageing effect and health benefits provided, potentially occurring via a delay in telomere shortening and modification of DNA methylation patterns associated with ageing. Exercise is among the primary modifiable factors capable of influencing bone health by preserving bone mass and strength, preventing the death of bone cells and anti-ageing action provided.
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Ryu SJ, Ryu DS, Kim JY, Park JY, Kim KH, Chin DK, Kim KS, Cho YE, Kuh SU. Changes in Bone Metabolism in Young Castrated Male Rats. Yonsei Med J 2016; 57:1386-94. [PMID: 27593866 PMCID: PMC5011270 DOI: 10.3349/ymj.2016.57.6.1386] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 01/03/2016] [Accepted: 01/28/2016] [Indexed: 11/27/2022] Open
Abstract
PURPOSE To determine the window of time during which osteoporosis affects the management of spinal surgery and the mechanism of bone metabolism changes in males with osteoporosis by examining changes in bone metabolism in young castrated male rats. MATERIALS AND METHODS A total of 30 Sprague-Dawley rats were randomly allocated into two study groups. Group 1 (control) received a sham surgery and Group 2 received bilateral orchiectomy to change bone mineral density (BMD). Serum osteocalcin, alkaline phosphatase (ALP), and collagen type 1 cross-linked C-telopeptide (CTX) were analyzed at postoperative date (POD) 8, 10, and 12 weeks. BMDs were measured using micro computed tomography scans. RESULTS Femoral and lumbar BMDs were decreased in the orchiectomy groups. BMDs in the sham and orchiectomy groups showed statistically differences at POD 8, 10, and 12 weeks for the femur (p=0.032, 0.008, 0.008) and lumbar spine (p=0.151, 0.008, 0.008, respectively). Serum osteocalcin, ALP, and CTX decreased gradually; however, N-terminal type 1 procollagen (P1NP) showed a slight increase yet no significant change. CONCLUSION In young castrated male rats, a significant decrease in BMD was observed after orchiectomy due to the mixture of two detrimental factors. Young castrated male rats did not reach peak BMD. Increased bone turnover causes bone resorption to exceed bone formation. This study may contribute to the creation of a valuable model for studies of male osteoporosis and the spinal surgery field.
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Affiliation(s)
- Seong Jun Ryu
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Dal Sung Ryu
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Jong Yeol Kim
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Jeong Yoon Park
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Kyung Hyun Kim
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Dong Kyu Chin
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Keun Su Kim
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Yong Eun Cho
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - Sung Uk Kuh
- Department of Neurosurgery, The Spine and Spinal Cord Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
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Park S, Park CY, Ham JO, Lee BK. Familial interactions and physical, lifestyle, and dietary factors to affect bone mineral density of children in the KNHANES 2009-2010. J Bone Miner Metab 2014; 32:455-67. [PMID: 24052208 DOI: 10.1007/s00774-013-0515-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Accepted: 08/11/2013] [Indexed: 10/26/2022]
Abstract
We examined familial bone mineral density (BMD) interactions between parents and children and lifestyle factors affecting BMD in the Korean general population of children under 20 and parents under 50 years of age. This cross-sectional study included 2,453 participants (667 daughters, 705 sons, 719 mothers, and 362 fathers) in the 2009-2010 Korean National Health and Nutrition Examination Survey. We calculated prevalence ratios and 95 % confidence intervals for BMD values of whole femur, femur neck, lumbar spine, and whole body excluding the head being in the low tertile in adolescents according to parental BMD tertile after adjusting for physical, lifestyle, and dietary factors. For daughters and sons, there were significant differences in BMD at the four bone sites according to age group, body fat percentage, regular walking and exercise, and milk consumption compared to the reference value for each classification category. Surprisingly, there were no differences in BMD according to serum 25-OH-D levels. Birth order affected BMD of only whole body except head, but its impact was less than that of lifestyle factors. The mean differences in BMD between daughters and sons in the first and third parental BMD tertiles were statistically significant. Notably, the prevalence ratio of whole body without head BMD being in the low tertile increased eight and ten-folds in adolescent daughters and sons, respectively, when parents were in the low BMD tertile. In specific bone regions, parental BMD had a greater effect on total femur in daughters but in the lumbar spine in sons. In conclusion, parental BMD positively influences BMD in daughters and sons after adjustment for environmental parameters. This suggests that the children from parents with low BMD need to make an extra effort to increase BMD through dietary and lifestyle changes.
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Affiliation(s)
- Sunmin Park
- Department of Food and Nutrition, Hoseo University, 165 Sechul-Ri Baebang-Myun, Asan-Si, Chungnam-Do, 336-795, South Korea
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Tenforde AS, Fredericson M. Influence of sports participation on bone health in the young athlete: a review of the literature. PM R 2012; 3:861-7. [PMID: 21944303 DOI: 10.1016/j.pmrj.2011.05.019] [Citation(s) in RCA: 158] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 04/29/2011] [Accepted: 05/19/2011] [Indexed: 11/19/2022]
Abstract
Peak bone mass is attained during the second and third decades of life. Sports participation during the years that peak bone mass is being acquired may lead to adaptive changes that improve bone architecture through increased density and enhanced geometric properties. A review of the literature evaluating sports participation in young athletes, ages 10-30 years, revealed that sports that involve high-impact loading (eg, gymnastics, hurdling, judo, karate, volleyball, and other jumping sports) or odd-impact loading (eg, soccer, basketball, racquet games, step-aerobics, and speed skating) are associated with higher bone mineral composition, bone mineral density (BMD), and enhanced bone geometry in anatomic regions specific to the loading patterns of each sport. Repetitive low-impact sports (such as distance running) are associated with favorable changes in bone geometry. Nonimpact sports such as swimming, water polo, and cycling are not associated with improvements in bone mineral composition or BMD, and swimming may negatively influence hip geometry. Participating in sports during early puberty may enhance bone mass. Continued participation in sports appears to maintain the full benefits of increased peak bone mass, although former athletes who do not maintain participation in sports may retain some benefits of increased BMD. Long-term elite male cycling was reported to negatively influence bone health, and female adolescent distance running was associated with suppressed bone mineral accrual; confounding factors associated with participation in endurance sports may have contributed to those findings. In summary, young men and women who participate in sports that involve high-impact or odd-impact loading exhibit the greatest associated gains in bone health. Participation in nonimpact sports, such as swimming and cycling, is not associated with an improvement in bone health.
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Affiliation(s)
- Adam S Tenforde
- Department of Medicine, Kaiser Permanente Oakland Medical Center, Oakland, CA, USA
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