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Villani AM, Crotty M, Cameron ID, Kurrle SE, Skuza PP, Cleland LG, Cobiac L, Miller MD. Appendicular skeletal muscle in hospitalised hip-fracture patients: development and cross-validation of anthropometric prediction equations against dual-energy X-ray absorptiometry. Age Ageing 2014; 43:857-62. [PMID: 25049262 DOI: 10.1093/ageing/afu106] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND accurate and practical assessment methods for assessing appendicular skeletal muscle (ASM) is of clinical importance for the diagnosis of geriatric syndromes associated with skeletal muscle wasting. OBJECTIVES the purpose of this study was to develop and cross-validate novel anthropometric prediction equations for the estimate of ASM in older adults post-surgical fixation for hip fracture, using dual-energy X-ray absorptiometry (DEXA) as the criterion measure. SUBJECTS community-dwelling older adults (aged ≥65 years) recently hospitalised for hip fracture. SETTING participants were recruited from hospital in the acute phase of recovery. DESIGN validation measurement study. MEASUREMENTS a total of 79 hip fracture patients were involved in the development of the regression models (MD group). A further 64 hip fracture patients also recruited in the early phase of recovery were used in the cross-validation of the regression models (CV group). Multiple linear regression analyses were undertaken in the MD group to identify the best performing prediction models. The linear coefficient of determination (R(2)) in addition to the standard error of the estimate (SEE) were calculated to determine the best performing model. Agreement between estimated ASM and ASMDEXA in the CV group was assessed using paired t-tests with the 95% limits of agreement (LOA) assessed using Bland-Altman analyses. RESULTS the mean age of all the participants was 82.1 ± 7.3 years. The best two prediction models are presented as follows: ASMPRED-EQUATION_1: 22.28 - (0.069 * age) + (0.407 * weight) - (0.807 * BMI) - (0.222 * MAC) (adjusted R(2): 0.76; SEE: 1.80 kg); ASMPRED-EQUATION_2: 16.77 - (0.036 * age) + (0.385 * weight) - (0.873 * BMI) (adjusted R(2): 0.73; SEE: 1.90 kg). The mean bias from the CV group between ASMDEXA and the predictive equations is as follows: ASMDEXA - ASMPRED-EQUATION_1: 0.29 ± 2.6 kg (LOA: -4.80, 5.40 kg); ASMDEXA - ASMPRED-EQUATION_2: 0.13 ± 2.5 kg (LOA: -4.77, 5.0 kg). No significant difference was observed between measured ASMDEXA and estimated ASM (ASMDEXA: 16.4 ± 3.9 kg; ASMPRED-EQUATION_1: 16.7 ± 3.2 kg (P = 0.379); ASMPRED-EQUATION_2: 16.6 ± 3.2 kg (P = 0.670)). CONCLUSIONS we have developed and cross-validated novel anthropometric prediction equations against DEXA for the estimate of ASM designed for application in older orthopaedic patients. Our equation may be of use as an alternative to DEXA in the diagnosis of skeletal muscle wasting syndromes. Further validation studies are required to determine the clinical utility of our equation across other settings, including hip fracture patients admitted from residential care, and also with a longer-term follow-up.
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Affiliation(s)
| | - Maria Crotty
- Rehabilitation and Aged Care, Flinders University, Adelaide, SA, Australia
| | - Ian D Cameron
- Rehabilitation Studies Unit, University of Sydney, Sydney, NSW, Australia
| | - Susan E Kurrle
- Division of Rehabilitation and Aged Care, Hornsby Ku-ring-gai Health Service, Sydney, NSW, Australia
| | - Pawel P Skuza
- eResearch, Central Library, Flinders University, Adelaide, SA, Australia
| | - Leslie G Cleland
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Lynne Cobiac
- Preventative Health Flagship, CSIRO, Adelaide, SA, Australia
| | - Michelle D Miller
- Nutrition and Dietetics, Flinders University, Adelaide, SA, Australia
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Clark RV, Walker AC, O'Connor-Semmes RL, Leonard MS, Miller RR, Stimpson SA, Turner SM, Ravussin E, Cefalu WT, Hellerstein MK, Evans WJ. Total body skeletal muscle mass: estimation by creatine (methyl-d3) dilution in humans. J Appl Physiol (1985) 2014; 116:1605-13. [PMID: 24764133 DOI: 10.1152/japplphysiol.00045.2014] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Current methods for clinical estimation of total body skeletal muscle mass have significant limitations. We tested the hypothesis that creatine (methyl-d3) dilution (D3-creatine) measured by enrichment of urine D3-creatinine reveals total body creatine pool size, providing an accurate estimate of total body skeletal muscle mass. Healthy subjects with different muscle masses [n = 35: 20 men (19-30 yr, 70-84 yr), 15 postmenopausal women (51-62 yr, 70-84 yr)] were housed for 5 days. Optimal tracer dose was explored with single oral doses of 30, 60, or 100 mg D3-creatine given on day 1. Serial plasma samples were collected for D3-creatine pharmacokinetics. All urine was collected through day 5. Creatine and creatinine (deuterated and unlabeled) were measured by liquid chromatography mass spectrometry. Total body creatine pool size and muscle mass were calculated from D3-creatinine enrichment in urine. Muscle mass was also measured by magnetic resonance imaging (MRI), dual-energy x-ray absorptiometry (DXA), and traditional 24-h urine creatinine. D3-creatine was rapidly absorbed and cleared with variable urinary excretion. Isotopic steady-state of D3-creatinine enrichment in the urine was achieved by 30.7 ± 11.2 h. Mean steady-state enrichment in urine provided muscle mass estimates that correlated well with MRI estimates for all subjects (r = 0.868, P < 0.0001), with less bias compared with lean body mass assessment by DXA, which overestimated muscle mass compared with MRI. The dilution of an oral D3-creatine dose determined by urine D3-creatinine enrichment provides an estimate of total body muscle mass strongly correlated with estimates from serial MRI with less bias than total lean body mass assessment by DXA.
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Affiliation(s)
- Richard V Clark
- Muscle Metabolism Discovery Performance Unit, Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline R&D, Research Triangle Park, North Carolina;
| | - Ann C Walker
- Muscle Metabolism Discovery Performance Unit, Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline R&D, Research Triangle Park, North Carolina
| | - Robin L O'Connor-Semmes
- Muscle Metabolism Discovery Performance Unit, Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline R&D, Research Triangle Park, North Carolina
| | - Michael S Leonard
- Muscle Metabolism Discovery Performance Unit, Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline R&D, Research Triangle Park, North Carolina
| | - Ram R Miller
- Muscle Metabolism Discovery Performance Unit, Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline R&D, Research Triangle Park, North Carolina
| | - Stephen A Stimpson
- Muscle Metabolism Discovery Performance Unit, Metabolic Pathways and Cardiovascular Therapeutic Area, GlaxoSmithKline R&D, Research Triangle Park, North Carolina
| | | | - Eric Ravussin
- Pennington Biomedical Research Center, Baton Rouge, Louisiana; and
| | - William T Cefalu
- Pennington Biomedical Research Center, Baton Rouge, Louisiana; and
| | - Marc K Hellerstein
- Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California
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53
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Ellis A, Crowe K, Lawrence J. Obesity-related inflammation: implications for older adults. J Nutr Gerontol Geriatr 2014; 32:263-90. [PMID: 24224937 DOI: 10.1080/21551197.2013.842199] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The combination of age-related increases in obesity and inflammation can lead to chronic disease, decreased strength, and physical disability. Lifestyle interventions that include moderate caloric restriction along with aerobic and resistance exercise have shown improvements in metabolic outcomes, strength, and physical function in obese older adults. Although few weight loss studies have addressed diet quality, evidence summarized in this review suggests that encouraging intake of antioxidant-rich fruits and vegetables, high-quality protein, low-glycemic index carbohydrates, and omega-3 fatty acids may further ameliorate obesity-related inflammation. Future controlled trials are indicated to examine the effects of incorporating these foods into multimodal weight loss interventions.
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Affiliation(s)
- Amy Ellis
- a Department of Human Nutrition , University of Alabama , Tuscaloosa , Alabama , USA
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Dias J, Avila MD, Damasceno VDO, Goncalves R, Barbosa FP, Lamounier JA, Vianna JM. Aplicabilidade do indice adiposidade corporal na estimativa do percentual de gordura de jovens mulheres brasileiras. REV BRAS MED ESPORTE 2014. [DOI: 10.1590/s1517-86922014000100003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
INTRODUÇÃO: A estimativa da composição corporal é um campo de estudo importante no prognóstico e diagnóstico de enfermidades degenerativas. OBJETIVO: Analisar a aplicabilidade do Índice de adiposidade corporal (IAC) e o método de dobras cutâneas. MÉTODOS: A amostra foi constituída por 19 adultas jovens com média de idade 24,53 ± 2,65 anos, submetidas à avaliação antropométrica (circunferências e dobras cutâneas) e absorsiometria por dupla emissão de raio X (DXA). Os valores estimados foram comparados ao valor de referência por meio do teste t pareado e pela análise do nível de associação entre os métodos pela correlação de Pearson; o nível de significância foi p < 0,05. RESULTADOS: Não apontaram diferenças significativas entre o percentual de gordura estimado pelo IAC e os valores de referência, porém, tiveram nível de associação moderado (r = 0,627). No entanto, o método de dobras cutâneas apresentou diferença estatística significante (p > 0,05) com nível de associação forte (r = 0,879). CONCLUSÃO: Embora o IAC não apresente diferença para os valores estimados, fica evidente a necessidade de mais estudos sobre a aplicabilidade do método na população brasileira.
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Kendler DL, Borges JLC, Fielding RA, Itabashi A, Krueger D, Mulligan K, Camargos BM, Sabowitz B, Wu CH, Yu EW, Shepherd J. The Official Positions of the International Society for Clinical Densitometry: Indications of Use and Reporting of DXA for Body Composition. J Clin Densitom 2013; 16:496-507. [PMID: 24090645 DOI: 10.1016/j.jocd.2013.08.020] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Accepted: 08/20/2013] [Indexed: 11/21/2022]
Abstract
The technique of body composition by dual-energy X-ray absorptiometry (DXA) has been used for several years in the research environment. Its ability to accurately and precisely measure lean, fat, and mineral composition in various body compartments has been well validated. Furthermore, the technique is widely available to clinical patients on existing DXA instruments throughout the world through the use of specific software packages and scanning algorithms. There have been few clear statements regarding the clinical indications for body composition measurement in patients outside the research setting. This is in part because of the lack of specific documented interventions that would be affected by body composition test results, beyond usual clinical advice. We have examined a few of the most common, specific scenarios (HIV therapy, sarcopenia, bariatric surgery, obesity) and proposed indications for body composition assessment. We have also discussed contraindications to body composition testing.
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Cooper C, Fielding R, Visser M, van Loon LJ, Rolland Y, Orwoll E, Reid K, Boonen S, Dere W, Epstein S, Mitlak B, Tsouderos Y, Sayer AA, Rizzoli R, Reginster JY, Kanis JA. Tools in the assessment of sarcopenia. Calcif Tissue Int 2013; 93:201-10. [PMID: 23842964 PMCID: PMC3744387 DOI: 10.1007/s00223-013-9757-z] [Citation(s) in RCA: 171] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 04/15/2013] [Indexed: 12/13/2022]
Abstract
This review provides a framework for the development of an operational definition of sarcopenia and of the potential end points that might be adopted in clinical trials among older adults. While the clinical relevance of sarcopenia is widely recognized, there is currently no universally accepted definition of the disorder. The development of interventions to alter the natural history of sarcopenia also requires consensus on the most appropriate end points for determining outcomes of clinical importance which might be utilized in intervention studies. We review current approaches to the definition of sarcopenia and the methods used for the assessment of various aspects of physical function in older people. The potential end points of muscle mass, muscle strength, muscle power, and muscle fatigue, as well as the relationships between them, are explored with reference to the availability and practicality of the available methods for measuring these end points in clinical trials. Based on current evidence, none of the four potential outcomes in question is sufficiently comprehensive to recommend as a uniform single outcome in randomized clinical trials. We propose that sarcopenia may be optimally defined (for the purposes of clinical trial inclusion criteria as well as epidemiological studies) using a combination of measures of muscle mass and physical performance. The choice of outcome measures for clinical trials in sarcopenia is more difficult; co-primary outcomes, tailored to the specific intervention in question, may be the best way forward in this difficult but clinically important area.
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Affiliation(s)
- C Cooper
- MRC Lifecourse Epidemiology Unit, University of Southampton, Southampton General Hospital, UK.
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Vellas B, Pahor M, Manini T, Rooks D, Guralnik JM, Morley J, Studenski S, Evans W, Asbrand C, Fariello R, Pereira S, Rolland Y, Abellan van Kan G, Cesari M, Chumlea WC, Fielding R. Designing pharmaceutical trials for sarcopenia in frail older adults: EU/US Task Force recommendations. J Nutr Health Aging 2013; 17:612-8. [PMID: 23933872 PMCID: PMC4077187 DOI: 10.1007/s12603-013-0362-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An international task force of academic and industry leaders in sarcopenia research met on December 5, 2012 in Orlando, Florida to develop guidelines for designing and executing randomized clinical trials of sarcopenia treatments. The Task Force reviewed results from previous trials in related disease areas to extract lessons relevant to future sarcopenia trials, including practical issues regarding the design and conduct of trials in elderly populations, the definition of appropriate target populations, and the selection of screening tools, outcome measures, and biomarkers. They discussed regulatory issues, the challenges posed by trials of different types of interventions, and the need for standardization and harmonization. The Task Force concluded with recommendations for advancing the field toward better clinical trials.
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Affiliation(s)
- B Vellas
- University of Toulouse III, Toulouse, France
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Chang CI, Chen CY, Huang KC, Wu CH, Hsiung C, Hsu CC, Chen CY. Comparison of three BIA muscle indices for sarcopenia screening in old adults. Eur Geriatr Med 2013. [DOI: 10.1016/j.eurger.2012.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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59
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Cesari M, Vellas B. Sarcopenia: a novel clinical condition or still a matter for research? J Am Med Dir Assoc 2012; 13:766-7. [PMID: 22959735 DOI: 10.1016/j.jamda.2012.07.020] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 07/30/2012] [Indexed: 01/24/2023]
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