Muscle Function Clinical Trial
Official title:
Does Exercise Snacking Improve Muscle Function in Older Adults?
Muscle size declines at around 0.5-1% per year after 50 years of age, with muscle strength declining up to twice as fast as muscle size. This may eventually lead to loss of independence if tasks of daily living become too strenuous to be performed safely. Exercise is recognized as a safe and effective means to counteract muscle loss during aging, however access to gym equipment may be logistically challenging or unpalatable to older adults. This research is designed to investigate the effect of 28 days of home-based leg exercise that doesn't require exercise equipment or supervision (exercise snacking), accompanied with a daily protein supplement in the form of commercially available yogurt, on the skeletal muscle health (i.e. function and size) of independent, community-dwelling older adults. To achieve this, two groups will be compared; one group will undertake exercise snacking and consume a 150 g yogurt with the breakfast meal for four weeks, with the second group only receiving the daily yogurt with no exercise snacking.
The study will require potential participants to undergo an eligibility screening with a
member of the research team, followed by a period of seven days of habitual activity
monitoring and 3 days of diet recording. Eligible participants will be allocated into study
groups by way of minimization based on sex, age, BMI, and number of sit-to-stands performed
in a minute. Participants will undertake two familiarisation sessions with strength, power,
neural drive, and balance tests at least seven days apart, the first following eligibility
screening and the second familiarisation session at least five days before the first main
trial.
Thereafter, both groups will undertake a main trial the day before commencing 28 days of
daily 150 g yoghurt supplement with the breakfast meal, with the exercise snacking group (ES)
also undertaking two bouts of exercise snacking a day. The main trial will include measures
of leg muscle function and neural drive, standing and single leg balance, and movement
co-ordination during tasks of everyday ambulation. Participants will wear a physical activity
monitor and pedometer for the seven days and record diet for three days during the last week
of the intervention. The day after the intervention period, a follow-up main trial will be
conducted as per the first main trial, followed by an optional qualitative interview
regarding participant's experience of the trial.
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