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1.
J Gen Intern Med ; 32(11): 1235-1241, 2017 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-28815485

RESUMEN

BACKGROUND: The optimal approach for selecting men for bone mineral density (BMD) testing to screen for osteoporosis is uncertain. OBJECTIVE: To compare strategies for selecting older men for screening BMD testing. DESIGN: Prospective cohort study. PARTICIPANTS: A total of 4043 community-dwelling men aged ≥70 years at four US sites. MAIN MEASURES: BMD at the total hip, femoral neck, and lumbar spine using dual-energy x-ray absorptiometry (DXA). Sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio, negative likelihood ratio, and area under the receiver operating curve (AUC) of the Osteoporosis Self-Assessment Tool (OST) and Fracture Risk Assessment Tool (FRAX) without BMD to discriminate between those with and without osteoporosis as defined by World Health Organization (WHO) diagnostic criteria, and between those recommended and not recommended for pharmacologic therapy based on the National Osteoporosis Foundation (NOF) guidelines. KEY RESULTS: Among the cohort, 216 (5.3%) had a BMD T-score ≤ -2.5 at the femoral neck, total hip, or lumbar spine, and 1184 (29.2%) met criteria for consideration of pharmacologic therapy according to NOF guidelines. The OST had better discrimination (AUC 0.68) than the FRAX (AUC 0.62; p = 0.004) for identifying T-score-defined osteoporosis. Use of an OST threshold of <2 resulted in sensitivity of 0.83 and specificity of 0.36 for the identification of osteoporosis, compared to sensitivity of 0.59 and specificity of 0.59 for the use of FRAX with a cutoff of 9.3% 10-year risk of major osteoporotic fracture. CONCLUSIONS: The OST performs modestly better than the more complex FRAX in selecting older men for BMD testing to screen for osteoporosis; the use of either tool substantially reduces the proportion of men referred for BMD testing compared to universal screening. Of 1000 men aged 70 and older in this community-based cohort, the use of an OST cutoff of <2 to select men for BMD testing would result in 654 men referred for BMD testing, of whom 44 would be identified as having osteoporosis, and nine with osteoporosis would be missed.


Asunto(s)
Densidad Ósea/fisiología , Tamizaje Masivo/métodos , Osteoporosis/diagnóstico , Osteoporosis/epidemiología , Curva ROC , Anciano , Anciano de 80 o más Años , Estudios de Cohortes , Humanos , Masculino , Estudios Prospectivos , Factores de Riesgo
2.
Am J Geriatr Psychiatry ; 22(4): 349-61, 2014 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-23567424

RESUMEN

OBJECTIVES: Aging is associated with changes in circadian rhythms. Current evidence supports a role for circadian rhythms in the pathophysiology of depression. However, little is known about the relationship between depressive symptoms and circadian activity rhythms in older adults. We examined this association in community-dwelling older women. METHODS: We performed a cross-sectional analysis of 3,020 women (mean age: 83.55 ± 3.79 years) enrolled in the Study of Osteoporotic Fractures. Depressive symptoms were assessed with the Geriatric Depression Scale categorizing participants as "normal" (0-2; referent group, N = 1,961), "some depressive symptoms" (3-5, N = 704), or "depressed" (≥6, N = 355). Circadian activity rhythm variables were measured using wrist actigraphy. RESULTS: In age-adjusted and Study of Osteoporotic Fractures site-adjusted models, greater levels of depressive symptoms were associated with decreased amplitude (height; df = 3,014, t = -11.31, p for linear trend <0.001), pseudo F-statistic (robustness; df = 3,014, t = -8.07, p for linear trend <0.001), and mesor (mean modeled activity; df = 3014, t = -10.36, p for linear trend <0.001) of circadian activity rhythms. Greater levels of depressive symptoms were also associated with increased odds of being in the lowest quartile for amplitude (df = 1, χ(2) = 9240, p for linear trend <0.001), pseudo F-statistic (df = 1, χ(2) = 49.73, p for linear trend <0.001), and mesor (df = 1, χ(2) = 81.12, p for linear trend <0.001). These associations remained significant in multivariate models. Post-hoc analyses comparing mean amplitude, mesor, and pseudo F-statistic values pair-wise between depression-level groups revealed significant differences between women with "some depressive symptoms" and the "normal" group. CONCLUSION: These data suggest a graded association between greater levels of depressive symptoms and more desynchronization of circadian activity rhythms in community-dwelling older women. This association was observed even for women endorsing subthreshold levels of depressive symptoms.


Asunto(s)
Envejecimiento/psicología , Trastornos Cronobiológicos/epidemiología , Depresión/epidemiología , Actigrafía , Anciano , Anciano de 80 o más Años , Envejecimiento/fisiología , Trastornos Cronobiológicos/psicología , Ritmo Circadiano , Estudios Transversales , Depresión/psicología , Femenino , Humanos , Modelos Lineales , Análisis Multivariante , Factores de Riesgo
3.
J Bone Miner Res ; 33(7): 1302-1311, 2018 07.
Artículo en Inglés | MEDLINE | ID: mdl-29624722

RESUMEN

Our objective was to determine the associations of peripheral bone strength and microarchitecture with incident clinical and major osteoporotic fracture among older men after adjusting for major clinical risk factors. We used a prospective cohort study design with data from 1794 men (mean age 84.4 years) in the Osteoporotic Fractures in Men (MrOS) study. Eligible men attended the year 14 visit, had high-resolution peripheral quantitative computed tomography (HR-pQCT) scans of the distal radius and distal or diaphyseal tibia, DXA measured BMD, and were followed for mean 1.7 years for incident fracture. Failure load was estimated using finite element analysis. We used Cox proportional hazards models with standardized HR-pQCT parameters as exposure variables. Primary outcome was clinical fracture (n = 108). Covariates included either Fracture Risk Assessment Tool (FRAX) major osteoporotic fracture probability calculated with BMD (FRAX-BMD), or individual clinical risk factors (CRF) including age, total hip BMD, race, falls, and prevalent fracture after age 50 years. Lower failure load was associated with higher risk of incident clinical fracture and incident major osteoporotic fracture. For clinical fracture with FRAX-BMD adjustment, the associations ranged from hazard ratio (HR) 1.58 (95% CI, 1.25 to 2.01) to 2.06 (95% CI, 1.60 to 2.66) per SD lower failure load at the diaphyseal tibia and distal radius. These associations were attenuated after adjustment for individual CRFs, but remained significant at the distal sites. Associations of volumetric BMD with these outcomes were similar to those for failure load. At the distal radius, lower trabecular BMD, number, and thickness, and lower cortical BMD, thickness, and area were all associated with higher risk of clinical fracture, but cortical porosity was not. Among community-dwelling older men, HR-pQCT measures including failure load, volumetric BMD, and microstructure parameters at peripheral sites (particularly distal radius) are robust independent predictors of clinical and major osteoporotic fracture. © 2018 American Society for Bone and Mineral Research.


Asunto(s)
Densidad Ósea , Extremidades/diagnóstico por imagen , Extremidades/fisiopatología , Fracturas Óseas/diagnóstico por imagen , Fracturas Óseas/fisiopatología , Medición de Riesgo , Tomografía Computarizada por Rayos X , Anciano , Anciano de 80 o más Años , Extremidades/patología , Fracturas Óseas/patología , Cadera/diagnóstico por imagen , Cadera/patología , Cadera/fisiopatología , Humanos , Masculino , Fracturas Osteoporóticas/diagnóstico por imagen , Fracturas Osteoporóticas/fisiopatología , Curva ROC , Factores de Riesgo , Tibia/diagnóstico por imagen , Tibia/patología , Tibia/fisiopatología , Soporte de Peso
4.
Sleep Med ; 16(10): 1236-44, 2015 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26429752

RESUMEN

OBJECTIVES: Obstructive respiratory events often terminate with an associated respiratory-related leg movement (RRLM). Such leg movements are not scored as periodic leg movements (periodic limb movements during sleep, PLMS), although the criteria for distinguishing RRLM from PLMS differ between the American Academy of Sleep Medicine (AASM) and the World Association of Sleep Medicine (WASM)/ International Restless Legs Syndrome Study Group (IRLSSG) scoring manuals. Such LMs may be clinically significant in patients with obstructive sleep apnea (OSA). The prevalence and correlation of RRLM in men with OSA were examined. METHODS: A case-control sample of 575 men was selected from all men with an apnea-hypopnea index (AHI, ≥3% desaturation criteria) ≥ 10 and good data from piezoelectric leg movement sensors at the first in-home sleep study in the MrOS cohort (mean age = 76.8 years). Sleep studies were rescored for RRLMs using five different RRLM definitions varying in both latency of leg movement onset from respiratory event termination and duration of the leg movement. The quartile of RRLM% (the number of RRLM/the number of hypopneas + apneas) was derived. RESULTS: The nonparametric densities of RRLM% were most influenced by alterations in the latency rather than the duration of the LM. The most liberal RRLM definition (latency 0-5 s, duration 0.5-10 s) led to a median RRLM% of 23.4 (interquartile range 12.41, 37.12) in this sample. The average AHI and arousal index increased as the quartile of RRLM% increased, as well as the prevalence of chronic obstructive pulmonary disease (COPD). The prevalence of those with a history of hypertension decreased as RRLM% increased. The non-Caucasian race was associated with lower RRLM%. CONCLUSION: Within an elderly sample with moderate to severe OSA, piezoelectric-defined RRLM% is associated with a number of sleep-related and demographic factors. Further study of the optimal definition, predictors, and consequences of RRLM is warranted.


Asunto(s)
Pierna/fisiopatología , Movimiento/fisiología , Apnea Obstructiva del Sueño/fisiopatología , Anciano , Estudios de Casos y Controles , Humanos , Hipertensión/complicaciones , Hipertensión/fisiopatología , Masculino , Polisomnografía , Enfermedad Pulmonar Obstructiva Crónica/complicaciones , Enfermedad Pulmonar Obstructiva Crónica/fisiopatología , Apnea Obstructiva del Sueño/complicaciones
5.
J Gerontol A Biol Sci Med Sci ; 70(6): 771-8, 2015 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-25362662

RESUMEN

BACKGROUND: Results of prospective studies examining the association between cystatin C and incident cognitive impairment have been inconsistent. We tested the hypothesis that there is a U-shaped association in older women between cystatin C and risk of incident cognitive impairment 10 years later. METHODS: We conducted a longitudinal analysis of a prospective cohort of 1,332 community-dwelling elderly women without dementia at baseline who had baseline cystatin C and serum creatinine measurements and completed an extended cognitive battery of neuropsychological tests with determination of cognitive status 10 years later. Incident cognitive impairment was defined as either new onset of adjudicated diagnosis of mild cognitive impairment or dementia. RESULTS: Incident mild cognitive impairment or dementia was identified among 140 (26.0%) women in quartile 1 (Q1), 122 (22.6%) in Q2, 121 (22.5%) in Q3, and 156 (28.9%) in Q4 of cystatin C. In the fully adjusted model, compared to women in Q2-Q3 of cystatin C, adjusted odds ratios (95% CI) for incident cognitive impairment were 1.31 (0.98-1.75) for Q1, and 1.25 (0.94-1.66) for Q4 Compared to women in Q2-Q3 of estimated glomerular filtration rate (eGFRCysC), adjusted odds ratios (95% CI) for incident cognitive impairment after 10 years of follow-up were 1.18 (0.88-1.58) for Q4 (eGFRCysC 76.1-109.4mL/min/1.73 m(2)) and 1.26 (0.94-1.67) for Q1 (eGFRCysC 21.8-55.5mL/min/1.73 m(2)). CONCLUSIONS: These results support a U-shaped association between cystatin C concentration and risk of cognitive impairment or dementia 10 years later, but the association is not independent of potential confounding factors.


Asunto(s)
Disfunción Cognitiva/epidemiología , Cistatina C/sangre , Demencia/epidemiología , Anciano , Envejecimiento , Disfunción Cognitiva/sangre , Disfunción Cognitiva/diagnóstico , Creatinina/sangre , Demencia/sangre , Demencia/diagnóstico , Femenino , Tasa de Filtración Glomerular , Humanos , Estudios Longitudinales , Pruebas Neuropsicológicas , Estudios Prospectivos , Estados Unidos/epidemiología
6.
Sleep ; 37(7): 1179-87, 2014 Jul 01.
Artículo en Inglés | MEDLINE | ID: mdl-25061246

RESUMEN

OBJECTIVE: To investigate the longitudinal relationship between subjective and objective sleep disturbance and depressive symptoms. DESIGN: Longitudinal. SETTING: Three US clinical centers. PARTICIPANTS: Nine hundred fifty-two community-dwelling older women (70 y or older). MEASUREMENTS: At baseline, subjective sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI) and objective sleep measures were assessed with wrist actigraphy. Depressive symptoms were assessed with the Geriatric Depression Scale (GDS) at baseline and approximately 5 y later. The analysis was restricted to women with few (GDS 0-2) depressive symptoms at baseline. RESULTS: There was an independent association between greater PSQI score (per standard deviation increase, indicating worse subjective sleep quality) at baseline and greater odds of worsening depressive symptoms (≥ 2-point increase in GDS) (Multivariate Odds Ratio [MOR] 1.19, confidence interval [CI] 1.01-1.40, P = 0.036). Higher scores specifically on the sleep quality (MOR 1.41, CI 1.13-1.77, P < 0.003) and sleep latency (MOR 1.21, CI 1.03-1.41, P = 0.018) PSQI subscales were also associated with greater odds for worsening depressive symptoms. Objective assessments revealed an association between baseline prolonged wake after sleep onset (WASO ≥ 60 min) and worsening depressive symptoms at follow-up (MOR 1.36, CI 1.01-1.84, P = 0.046). There were no associations between other objectively assessed sleep measures and worsening depressive symptoms. CONCLUSIONS: In older women with few or no depressive symptoms at baseline, those with more subjectively reported sleep disturbance and more objectively assessed fragmentation of sleep at baseline had greater odds of worsening depressive symptoms 5 y later. Future studies investigating this relationship in more detail are indicated. CITATION: Maglione JE, Ancoli-Israel S, Peters KW, Paudel ML, Yaffe K, Ensrud KE, Stone KL, Study of Osteoporotic Fractures Research Group. Subjective and objective sleep disturbance and longitudinal risk of depression in a cohort of older women.


Asunto(s)
Depresión/complicaciones , Trastornos del Sueño-Vigilia/complicaciones , Trastornos del Sueño-Vigilia/diagnóstico , Actigrafía , Anciano , Anciano de 80 o más Años , Depresión/diagnóstico , Depresión/fisiopatología , Depresión/psicología , Femenino , Humanos , Estudios Longitudinales , Oportunidad Relativa , Sueño/fisiología , Trastornos del Sueño-Vigilia/fisiopatología , Trastornos del Sueño-Vigilia/psicología , Estados Unidos
7.
BMJ ; 349: g4120, 2014 Jul 03.
Artículo en Inglés | MEDLINE | ID: mdl-24994809

RESUMEN

OBJECTIVES: To quantify incremental effects of applying different criteria to identify men who are candidates for drug treatment to prevent fracture and to examine the extent to which fracture probabilities vary across distinct categories of men defined by these criteria. DESIGN: Cross sectional and longitudinal analysis of a prospective cohort study. SETTING: Multicenter Osteoporotic Fractures in Men (MrOS) study in the United States. PARTICIPANTS: 5880 untreated community dwelling men aged 65 years or over classified into four distinct groups: osteoporosis by World Health Organization criteria alone; osteoporosis by National Osteoporosis Foundation (NOF) but not WHO criteria; no osteoporosis but at high fracture risk (at or above NOF derived FRAX intervention thresholds recommended for US); and no osteoporosis and at low fracture risk (below NOF derived FRAX intervention thresholds recommended for US). MAIN OUTCOME MEASURES: Proportion of men identified for drug treatment; predicted 10 year probabilities of hip and major osteoporotic fracture calculated using FRAX algorithm with femoral neck bone mineral density; observed 10 year probabilities for confirmed incident hip and major osteoporotic (hip, clinical vertebral, wrist, or humerus) fracture events calculated using cumulative incidence estimation, accounting for competing risk of mortality. RESULTS: 130 (2.2%) men were identified as having osteoporosis by using the WHO definition, and an additional 422 were identified by applying the NOF definition (total osteoporosis prevalence 9.4%). Application of NOF derived FRAX intervention thresholds led to 936 (15.9%) additional men without osteoporosis being identified as at high fracture risk, raising the total prevalence of men potentially eligible for drug treatment to 25.3%. Observed 10 year hip fracture probabilities were 20.6% for men with osteoporosis by WHO criteria alone, 6.8% for men with osteoporosis by NOF (but not WHO) criteria, 6.4% for men without osteoporosis but classified as at high fracture risk, and 1.5% for men without osteoporosis and classified as at low fracture risk. A similar pattern was noted in observed fracture probabilities for major osteoporotic fracture. Among men with osteoporosis by WHO criteria, observed fracture probabilities were greater than FRAX predicted probabilities (20.6% v 9.5% for hip fracture and 30.0% v 17.4% for major osteoporotic fracture). CONCLUSIONS AND RELEVANCE: Choice of definition of osteoporosis and use of NOF derived FRAX intervention thresholds have major effects on the proportion of older men identified as warranting drug treatment to prevent fracture. Among men identified with osteoporosis by WHO criteria, who comprised 2% of the study population, actual observed fracture probabilities during 10 years of follow-up were highest and exceeded FRAX predicted fracture probabilities. On the basis of findings from randomized trials in women, these men are most likely to benefit from treatment. Expanding indications for treatment beyond this small group has uncertain value owing to lower observed fracture probabilities and uncertain benefits of treatment among men not selected on the basis of WHO criteria.


Asunto(s)
Quimioprevención , Fracturas Osteoporóticas/prevención & control , Anciano , Anciano de 80 o más Años , Algoritmos , Densidad Ósea , Estudios de Cohortes , Estudios Transversales , Humanos , Estudios Longitudinales , Masculino , Fracturas Osteoporóticas/epidemiología , Prevalencia , Estudios Prospectivos , Factores de Riesgo
8.
Bone ; 67: 152-5, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-25003811

RESUMEN

We describe the methods and reliability of radiographic vertebral fracture assessment in MrOS, a cohort of community dwelling men aged ≥65yrs. Lateral spine radiographs were obtained at Visit 1 (2000-2) and 4.6years later (Visit 2). Using a workflow tool (SpineAnalyzer™, Optasia Medical), a physician reader completed semi-quantitative (SQ) scoring. Prior to SQ scoring, technicians performed "triage" to reduce physician reader workload, whereby clearly normal spine images were eliminated from SQ scoring with all levels assumed to be SQ=0 (no fracture, "triage negative"); spine images with any possible fracture or abnormality were passed to the physician reader as "triage positive" images. Using a quality assurance sample of images (n=20 participants; 8 with baseline only and 12 with baseline and follow-up images) read multiple times, we calculated intra-reader kappa statistics and percent agreement for SQ scores. A subset of 494 participants' images was read regardless of triage classification to calculate the specificity and sensitivity of triage. Technically adequate images were available for 5958 of 5994 participants at Visit 1, and 4399 of 4423 participants at Visit 2. Triage identified 3215 (53.9%) participants with radiographs that required further evaluation by the physician reader. For prevalent fractures at Visit 1 (SQ≥1), intra-reader kappa statistics ranged from 0.79 to 0.92; percent agreement ranged from 96.9% to 98.9%; sensitivity of the triage was 96.8% and specificity of triage was 46.3%. In conclusion, SQ scoring had excellent intra-rater reliability in our study. The triage process reduces expert reader workload without hindering the ability to identify vertebral fractures.


Asunto(s)
Fracturas Osteoporóticas/diagnóstico por imagen , Fracturas Osteoporóticas/diagnóstico , Fracturas de la Columna Vertebral/diagnóstico por imagen , Fracturas de la Columna Vertebral/diagnóstico , Anciano , Anciano de 80 o más Años , Humanos , Masculino , Persona de Mediana Edad , Radiografía
9.
J Gerontol A Biol Sci Med Sci ; 69(5): 584-90, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24737561

RESUMEN

BACKGROUND: Several consensus groups have previously published operational criteria for sarcopenia, incorporating lean mass with strength and/or physical performance. The purpose of this manuscript is to describe the prevalence, agreement, and discrepancies between the Foundation for the National Institutes of Health (FNIH) criteria with other operational definitions for sarcopenia. METHODS: The FNIH Sarcopenia Project used data from nine studies including: Age, Gene and Environment Susceptibility-Reykjavik Study; Boston Puerto Rican Health Study; a series of six clinical trials from the University of Connecticut; Framingham Heart Study; Health, Aging, and Body Composition Study; Invecchiare in Chianti; Osteoporotic Fractures in Men Study; Rancho Bernardo Study; and Study of Osteoporotic Fractures. Participants included in these analyses were aged 65 and older and had measures of body mass index, appendicular lean mass, grip strength, and gait speed. RESULTS: The prevalence of sarcopenia and agreement proportions was higher in women than men. The lowest prevalence was observed with the FNIH criteria (1.3% men and 2.3% women) compared with the International Working Group and the European Working Group for Sarcopenia in Older Persons (5.1% and 5.3% in men and 11.8% and 13.3% in women, respectively). The positive percent agreements between the FNIH criteria and other criteria were low, ranging from 7% to 32% in men and 5% to 19% in women. However, the negative percent agreement were high (all >95%). CONCLUSIONS: The FNIH criteria result in a more conservative operational definition of sarcopenia, and the prevalence was lower compared with other proposed criteria. Agreement for diagnosing sarcopenia was low, but agreement for ruling out sarcopenia was very high. Consensus on the operational criteria for the diagnosis of sarcopenia is much needed to characterize populations for study and to identify adults for treatment.


Asunto(s)
Fuerza de la Mano/fisiología , Sarcopenia/diagnóstico , Sarcopenia/fisiopatología , Factores de Edad , Anciano , Índice de Masa Corporal , Femenino , Marcha/fisiología , Humanos , Masculino , National Institutes of Health (U.S.) , Prevalencia , Sarcopenia/epidemiología , Factores Sexuales , Delgadez/diagnóstico , Delgadez/epidemiología , Delgadez/fisiopatología , Estados Unidos/epidemiología
10.
J Gerontol A Biol Sci Med Sci ; 69(5): 547-58, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24737557

RESUMEN

BACKGROUND: Low muscle mass and weakness are common and potentially disabling in older adults, but in order to become recognized as a clinical condition, criteria for diagnosis should be based on clinically relevant thresholds and independently validated. The Foundation for the National Institutes of Health Biomarkers Consortium Sarcopenia Project used an evidence-based approach to develop these criteria. Initial findings were presented at a conference in May 2012, which generated recommendations that guided additional analyses to determine final recommended criteria. Details of the Project and its findings are presented in four accompanying manuscripts. METHODS: The Foundation for the National Institutes of Health Sarcopenia Project used data from nine sources of community-dwelling older persons: Age, Gene/Environment Susceptibility-Reykjavik Study, Boston Puerto Rican Health Study, a series of six clinical trials, Framingham Heart Study, Health, Aging, and Body Composition, Invecchiare in Chianti, Osteoporotic Fractures in Men Study, Rancho Bernardo Study, and Study of Osteoporotic Fractures. Feedback from conference attendees was obtained via surveys and breakout groups. RESULTS: The pooled sample included 26,625 participants (57% women, mean age in men 75.2 [±6.1 SD] and in women 78.6 [±5.9] years). Conference attendees emphasized the importance of evaluating the influence of body mass on cutpoints. Based on the analyses presented in this series, the final recommended cutpoints for weakness are grip strength <26kg for men and <16kg for women, and for low lean mass, appendicular lean mass adjusted for body mass index <0.789 for men and <0.512 for women. CONCLUSIONS: These evidence-based cutpoints, based on a large and diverse population, may help identify participants for clinical trials and should be evaluated among populations with high rates of functional limitations.


Asunto(s)
Sarcopenia/diagnóstico , Factores de Edad , Anciano , Anciano de 80 o más Años , Índice de Masa Corporal , Susceptibilidad a Enfermedades , Femenino , Fuerza de la Mano , Humanos , Masculino , National Institutes of Health (U.S.) , Proyectos de Investigación , Factores de Riesgo , Sarcopenia/etiología , Factores Sexuales , Estados Unidos
11.
J Gerontol A Biol Sci Med Sci ; 69(5): 559-66, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24737558

RESUMEN

BACKGROUND: Weakness is common and contributes to disability, but no consensus exists regarding a strength cutpoint to identify persons at high risk. This analysis, conducted as part of the Foundation for the National Institutes of Health Sarcopenia Project, sought to identify cutpoints that distinguish weakness associated with mobility impairment, defined as gait speed less than 0.8 m/s. METHODS: In pooled cross-sectional data (9,897 men and 10,950 women), Classification and Regression Tree analysis was used to derive cutpoints for grip strength associated with mobility impairment. RESULTS: In men, a grip strength of 26-32 kg was classified as "intermediate" and less than 26 kg as "weak"; 11% of men were intermediate and 5% were weak. Compared with men with normal strength, odds ratios for mobility impairment were 3.63 (95% CI: 3.01-4.38) and 7.62 (95% CI 6.13-9.49), respectively. In women, a grip strength of 16-20 kg was classified as "intermediate" and less than 16 kg as "weak"; 25% of women were intermediate and 18% were weak. Compared with women with normal strength, odds ratios for mobility impairment were 2.44 (95% CI 2.20-2.71) and 4.42 (95% CI 3.94-4.97), respectively. Weakness based on these cutpoints was associated with mobility impairment across subgroups based on age, body mass index, height, and disease status. Notably, in women, grip strength divided by body mass index provided better fit relative to grip strength alone, but fit was not sufficiently improved to merit different measures by gender and use of a more complex measure. CONCLUSIONS: Cutpoints for weakness derived from this large, diverse sample of older adults may be useful to identify populations who may benefit from interventions to improve muscle strength and function.


Asunto(s)
Marcha/fisiología , Fuerza de la Mano/fisiología , Limitación de la Movilidad , Debilidad Muscular/diagnóstico , Debilidad Muscular/fisiopatología , Sarcopenia/fisiopatología , Factores de Edad , Anciano , Anciano de 80 o más Años , Estudios Transversales , Femenino , Humanos , Masculino , Sarcopenia/diagnóstico , Factores Sexuales , Estados Unidos
12.
J Gerontol A Biol Sci Med Sci ; 69(5): 567-75, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24737559

RESUMEN

BACKGROUND: Low lean mass is potentially clinically important in older persons, but criteria have not been empirically validated. As part of the FNIH (Foundation for the National Institutes of Health) Sarcopenia Project, this analysis sought to identify cutpoints in lean mass by dual-energy x-ray absorptiometry that discriminate the presence or absence of weakness (defined in a previous report in the series as grip strength <26kg in men and <16kg in women). METHODS: In pooled cross-sectional data stratified by sex (7,582 men and 3,688 women), classification and regression tree (CART) analysis was used to derive cutpoints for appendicular lean body mass (ALM) that best discriminated the presence or absence of weakness. Mixed-effects logistic regression was used to quantify the strength of the association between lean mass category and weakness. RESULTS: In primary analyses, CART models identified cutpoints for low lean mass (ALM <19.75kg in men and <15.02kg in women). Sensitivity analyses using ALM divided by body mass index (BMI: ALMBMI) identified a secondary definition (ALMBMI <0.789 in men and ALMBMI <0.512 in women). As expected, after accounting for study and age, low lean mass (compared with higher lean mass) was associated with weakness by both the primary (men, odds ratio [OR]: 6.9 [95% CI: 5.4, 8.9]; women, OR: 3.6 [95% CI: 2.9, 4.3]) and secondary definitions (men, OR: 4.3 [95% CI: 3.4, 5.5]; women, OR: 2.2 [95% CI: 1.8, 2.8]). CONCLUSIONS: ALM cutpoints derived from a large, diverse sample of older adults identified lean mass thresholds below which older adults had a higher likelihood of weakness.


Asunto(s)
Fuerza de la Mano/fisiología , Debilidad Muscular/diagnóstico , Debilidad Muscular/fisiopatología , Sarcopenia/fisiopatología , Delgadez/diagnóstico , Delgadez/fisiopatología , Absorciometría de Fotón , Factores de Edad , Anciano , Índice de Masa Corporal , Estudios Transversales , Femenino , Humanos , Masculino , Sarcopenia/diagnóstico , Factores Sexuales , Estados Unidos
13.
J Gerontol A Biol Sci Med Sci ; 69(5): 576-83, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24737560

RESUMEN

BACKGROUND: This analysis sought to determine the associations of the Foundation for the National Institutes of Health Sarcopenia Project criteria for weakness and low lean mass with likelihood for mobility impairment (gait speed ≤ 0.8 m/s) and mortality. Providing validity for these criteria is essential for research and clinical evaluation. METHODS: Among 4,411 men and 1,869 women pooled from 6 cohort studies, 3-year likelihood for incident mobility impairment and mortality over 10 years were determined for individuals with weakness, low lean mass, and for those having both. Weakness was defined as low grip strength (<26kg men and <16kg women) and low grip strength-to-body mass index (BMI; kg/m(2)) ratio (<1.00 men and <0.56 women). Low lean mass (dual-energy x-ray absorptiometry) was categorized as low appendicular lean mass (ALM; <19.75kg men and <15.02kg women) and low ALM-to-BMI ratio (<0.789 men and <0.512 women). RESULTS: Low grip strength (men: odds ratio [OR] = 2.31, 95% confidence interval [CI] = 1.34-3.99; women: OR = 1.99, 95% CI 1.23-3.21), low grip strength-to-BMI ratio (men: OR = 3.28, 95% CI 1.92-5.59; women: OR = 2.54, 95% CI 1.10-5.83) and low ALM-to-BMI ratio (men: OR = 1.58, 95% CI 1.12-2.25; women: OR = 1.81, 95% CI 1.14-2.87), but not low ALM, were associated with increased likelihood for incident mobility impairment. Weakness increased likelihood of mobility impairment regardless of low lean mass. Mortality risk patterns were inconsistent. CONCLUSIONS: These findings support our cut-points for low grip strength and low ALM-to-BMI ratio as candidate criteria for clinically relevant weakness and low lean mass. Further validation in other populations and for alternate relevant outcomes is needed.


Asunto(s)
Limitación de la Movilidad , Debilidad Muscular/mortalidad , Debilidad Muscular/fisiopatología , Sarcopenia/fisiopatología , Delgadez/complicaciones , Delgadez/fisiopatología , Anciano , Femenino , Marcha/fisiología , Fuerza de la Mano/fisiología , Humanos , Incidencia , Estudios Longitudinales , Masculino , Debilidad Muscular/diagnóstico , National Institutes of Health (U.S.) , Sarcopenia/diagnóstico , Sarcopenia/mortalidad , Estados Unidos/epidemiología
14.
J Am Geriatr Soc ; 60(4): 635-43, 2012 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-22428562

RESUMEN

OBJECTIVES: To examine the relationship between depressive symptoms and subjective and objective sleep in older women. DESIGN: Cross-sectional. SETTING: Four U.S. clinical centers. PARTICIPANTS: Three thousand forty-five community-dwelling women aged 70 and older. MEASUREMENTS: Depressive symptoms were assessed using the Geriatric Depression Scale, categorizing participants as normal (0-2, reference), some depressive symptoms (3-5), or depressed (≥ 6). Subjective sleep quality and daytime sleepiness were assessed using the Pittsburgh Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS). Objective sleep measures were assessed using wrist actigraphy. RESULTS: In multivariable-adjusted models, there were graded associations between greater level of depressive symptoms and worse subjective sleep quality and more subjective daytime sleepiness (P-trends < .001). Women with some depressive symptoms (odds ratio (OR) = 1.82, 95% confidence interval (CI) = 1.48-2.24) and depressed (OR = 2.84, 95% CI = 2.08-3.86) women had greater odds of reporting poor sleep (PSQI>5). Women with some depressive symptoms (OR = 1.97, 95% CI = 1.47-2.64) and depressed women (OR = 1.70, 95% CI = 1.12-2.58) had greater odds of reporting excessive daytime sleepiness (ESS>10). There were also graded associations between greater level of depressive symptoms and objectively measured wake after sleep onset (WASO) (P-trend = .03) and wake episodes longer than 5 minutes (P-trend = .006). Depressed women had modestly higher odds of WASO of 1 hour or longer (OR = 1.37, 95% CI = 1.03-1.83). Women with some depressive symptoms (OR = 1.49, 95% CI = 1.19-1.86) and depressed women (OR = 2.04, 95% CI = 1.52-2.74) had greater odds of being in the highest quartile for number of nap episodes longer than 5 minutes. No associations between depressive symptom level and prolonged sleep latency, poor sleep efficiency, or short or long total sleep time were found. CONCLUSION: Greater depressive symptom levels were associated with more subjective sleep disturbance and objective evidence of sleep fragmentation and napping.


Asunto(s)
Depresión/complicaciones , Evaluación Geriátrica/métodos , Trastornos del Sueño-Vigilia/etiología , Sueño/fisiología , Actigrafía , Anciano , Anciano de 80 o más Años , Estudios Transversales , Depresión/diagnóstico , Depresión/epidemiología , Depresión/fisiopatología , Femenino , Estudios de Seguimiento , Humanos , Oportunidad Relativa , Prevalencia , Estudios Retrospectivos , Trastornos del Sueño-Vigilia/diagnóstico , Trastornos del Sueño-Vigilia/fisiopatología , Estados Unidos/epidemiología
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