Serum [25(OH)D] status, ankle strength and activity show seasonal variation in older adults: relevance for winter falls in higher latitudes

Age and Ageing
Marie-Louise BirdAndrew D Williams

Abstract

seasonal variation exists in serum [25(OH)D] and physical activity, especially at higher latitudes, and these factors impact lower limb strength. This study investigates seasonal variation in leg strength in a longitudinal repeated measures design concurrently with serum vitamin D and physical activity. eighty-eight community-dwelling independently mobile older adults (69.2 ± 6.5 years) were evaluated five times over a year, at the end of five consecutive seasons at latitude 41.1°S, recruited in two cohorts. Leg strength, serum [25(OH)D] and physical activity levels were measured. Time spent outside was recorded. Monthly falls diaries recorded falls. Data were analysed to determine annual means and percentage changes. significant variation in [25(OH)D] (±15%), physical activity (±13%), ankle dorsiflexion strength (±8%) and hours spent outside (±20%) (all P < 0.001) was demonstrated over the year, with maximums in January and February (mid-summer). Low mean ankle strength was associated with increased incidence of falling (P = 0.047). Quadriceps strength did not change (±2%; P = 0.53). ankle dorsiflexor strength varied seasonally. Increased ankle strength in summer may be influenced by increased levels of outdoors activity over ...Continue Reading

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Citations

Jan 15, 2013·Obesity Surgery·Jaime Ruiz-TovarRafael Calpena
Nov 29, 2013·International Journal of Environmental Research and Public Health·Marie-Louise BirdKiran D K Ahuja
Apr 30, 2015·The Journal of Nutrition, Health & Aging·J K PittawayM J Ball
Apr 22, 2015·Archives of Gynecology and Obstetrics·Rimpi Singla
Apr 17, 2015·Archives of Gynecology and Obstetrics·Fatma Beyazit, Yavuz Beyazit
Aug 26, 2014·Journal of Pediatric Endocrinology & Metabolism : JPEM·Emel TorunIlker Tolga Ozgen
Oct 8, 2019·Journal of the American Podiatric Medical Association·Karan MalhotraJulian Livingstone
Nov 25, 2017·Social Science Research·Laura UpenieksMarkus H Schafer

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