Mid-calf skeletal muscle density and its associations with physical activity, bone health and incident 12-month falls in older adults: The Healthy Ageing Initiative

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Scott, David (author)

Mid-calf skeletal muscle density and its associations with physical activity, bone health and incident 12-month falls in older adults : The Healthy Ageing Initiative

Article/chapterEnglish2019

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Elsevier,2019
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LIBRIS-ID:oai:DiVA.org:umu-156222
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-156222URI
https://doi.org/10.1016/j.bone.2018.12.004DOI

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Language:English
Summary in:English

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BACKGROUND: Lower skeletal muscle density, indicating greater infiltration of adipose tissue into muscles, is associated with higher fracture risk in older adults. We aimed to determine whether mid-calf muscle density is associated with falls risk and bone health in community-dwelling older adults.METHODS: 2214 community-dwelling men and women who participated in the Healthy Ageing Initiative (Sweden) study at age 70 were included in this analysis. Mid-calf muscle density (mg/cm3) at the proximal tibia, and volumetric bone mineral density (vBMD) and architecture at the distal and proximal tibia and radius, were assessed by peripheral quantitative computed tomography. Whole-body lean and fat mass, lumbar spine and total hip areal bone mineral density (aBMD) were assessed by dual-energy X-ray absorptiometry. Participants completed seven-day accelerometer measurements of physical activity intensity, and self-reported falls data were collected 6 and 12 months later.RESULTS: 302 (13.5%) participants reported a fall at the 6- or 12-month interview, and 29 (1.3%) reported a fall at both interviews. After adjustment for confounders, each standard deviation decrease in mid-calf muscle density was associated with a trend towards greater likelihood of experiencing a fall (OR 1.13; 95% CI 1.00, 1.29 per SD lower) and significantly greater likelihood of multiple falls (1.61; 1.16, 2.23). Higher muscle density was not associated with total hip aBMD, and was associated with lower lumbar spine aBMD (B = -0.003; 95% CI -0.005, -0.001 per mg/cm3) and higher proximal cortical vBMD (0.74; 0.20, 1.28) at the radius. At the tibia, muscle density was positively associated with distal total and trabecular vBMD, and proximal total and cortical vBMD, cortical thickness, cortical area and stress-strain index (all P < 0.05). Only moderate/vigorous (%) intensity physical activity, not sedentary time or light activity, was associated with higher mid-calf muscle density (0.086; 0.034, 0.138).CONCLUSIONS: Lower mid-calf muscle density is independently associated with higher likelihood for multiple incident falls and appears to have localised negative effects on bone structure in older adults.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Geriatrik hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Geriatrics hsv//eng
Bone density
Falls
Muscle density
Osteoporosis
Physical activity
Sarcopenia

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Johansson, Jonas,1984-Umeå universitet,Yrkes- och miljömedicin(Swepub:umu)jojo0014 (author)
McMillan, Lachlan B (author)
Ebeling, Peter R (author)
Nordström, AnnaUmeå universitet,Yrkes- och miljömedicin,School of Sport Sciences, UiT The Arctic University of Norway, Tromsø, Norway.(Swepub:umu)anagun97 (author)
Nordström, PeterUmeå universitet,Geriatrik(Swepub:umu)peno0014 (author)
Umeå universitetYrkes- och miljömedicin (creator_code:org_t)

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In:Bone: Elsevier120, s. 446-4518756-32821873-2763

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By the author/editor: Scott, David; Johansson, Jonas ...; McMillan, Lachla ...; Ebeling, Peter R; Nordström, Anna; Nordström, Peter

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