2,000 steps/day does not fully protect skeletal muscle health in older adults during bed rest

Emily Arentson-Lantz, Elfego Galvan, Adam Wacher, Christopher S. Fry, Douglas Paddon-Jones

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Physical activity in an inpatient setting is often limited to brief periods of walking. For healthy adults, public health agencies recommend a minimum of 150 min/week of moderate-intensity exercise. The authors sought to determine if meeting this activity threshold, in the absence of incidental activities of daily living, could protect skeletal muscle health during bed rest. Healthy older adults (68 ± 2 years) were randomized to 7-day bed rest with (STEP, n = 7) or without (CON, n = 10) a 2,000 steps/day intervention. Performing 2018 ± 4 steps/day did not prevent the loss of lean leg mass and had no beneficial effect on aerobic capacity, strength, or muscle fiber volume. However, the insulin response to an oral glucose challenge was preserved. Performing a block of 2,000 steps/day, in the absence of incidental activities of daily living, was insufficient to fully counter the catabolic effects of bed rest in healthy older adults.

Original languageEnglish (US)
Pages (from-to)191-197
Number of pages7
JournalJournal of aging and physical activity
Volume27
Issue number2
DOIs
StatePublished - 2019

Keywords

  • atrophy
  • inactivity
  • muscle function
  • physical activity

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Gerontology
  • Geriatrics and Gerontology

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