Abstract
Sleep interventions have rarely explored reductions in night-to-night fluctuations [i.e. intra-individual variability (IIV)] in sleep, despite the negative impacts of such fluctuations on affective states and cognitive and physical symptoms. In a community-based randomized controlled trial we evaluated whether physical exercise reduced IIV in self-rated sleep outcomes among middle-aged and older adults with sleep complaints. Under-active adults 55years and older (n=66, 67% women) with mild to moderate sleep complaints were randomized to 12 months of a moderate-intensity endurance exercise (n=36) or a health education control group (n=30). Daily sleep logs, Pittsburgh Sleep Quality Index (PSQI) and in-home polysomnographic sleep recordings (PSG) were collected at baseline, 6months and 12months. Sleep log-derived means and IIV were computed for sleep-onset latency (SOL), time in bed, feeling rested in the morning, number of nighttime awakenings, and wake after final awakening (WAFA). Using intent-to-treat methods, at 6months no differences in IIV were observed by group. At 12months, SOL-based IIV was reduced in the exercise group compared with the control (difference=23.11, 95% CI: 3.04-47.18, P=0.025, Cohen's d=0.57). This change occurred without mean-level or IIV changes in sleep-wake schedules. For all sleep variables, except SOL and WAFA, IIV changes and mean-level changes in each variable were negatively correlated (r=-0.312 to -0.691, P<0.05). Sleep log-derived IIV changes were modestly correlated with mean-level PSQI and PSG-based changes at 12months. Twelve months of moderate-intensity exercise reduced night-to-night fluctuations in self-rated time to fall asleep, and this relationship was independent of mean-level time to fall asleep.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 28-37 |
| Number of pages | 10 |
| Journal | Journal of Sleep Research |
| Volume | 20 |
| Issue number | 1 PART I |
| DOIs | |
| State | Published - Mar 2011 |
| Externally published | Yes |
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Keywords
- Intervention
- Intra-individual variability
- Physical activity
- Sleep
- Sleep-onset latency
- Unpredictability
ASJC Scopus subject areas
- Behavioral Neuroscience
- Cognitive Neuroscience
- Medicine(all)
Cite this
Exercise effects on night-to-night fluctuations in self-rated sleep among older adults with sleep complaints. / Buman, Matthew; Hekler, Eric B.; Bliwise, Donald L.; King, Abby C.
In: Journal of Sleep Research, Vol. 20, No. 1 PART I, 03.2011, p. 28-37.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exercise effects on night-to-night fluctuations in self-rated sleep among older adults with sleep complaints
AU - Buman, Matthew
AU - Hekler, Eric B.
AU - Bliwise, Donald L.
AU - King, Abby C.
PY - 2011/3
Y1 - 2011/3
N2 - Sleep interventions have rarely explored reductions in night-to-night fluctuations [i.e. intra-individual variability (IIV)] in sleep, despite the negative impacts of such fluctuations on affective states and cognitive and physical symptoms. In a community-based randomized controlled trial we evaluated whether physical exercise reduced IIV in self-rated sleep outcomes among middle-aged and older adults with sleep complaints. Under-active adults 55years and older (n=66, 67% women) with mild to moderate sleep complaints were randomized to 12 months of a moderate-intensity endurance exercise (n=36) or a health education control group (n=30). Daily sleep logs, Pittsburgh Sleep Quality Index (PSQI) and in-home polysomnographic sleep recordings (PSG) were collected at baseline, 6months and 12months. Sleep log-derived means and IIV were computed for sleep-onset latency (SOL), time in bed, feeling rested in the morning, number of nighttime awakenings, and wake after final awakening (WAFA). Using intent-to-treat methods, at 6months no differences in IIV were observed by group. At 12months, SOL-based IIV was reduced in the exercise group compared with the control (difference=23.11, 95% CI: 3.04-47.18, P=0.025, Cohen's d=0.57). This change occurred without mean-level or IIV changes in sleep-wake schedules. For all sleep variables, except SOL and WAFA, IIV changes and mean-level changes in each variable were negatively correlated (r=-0.312 to -0.691, P<0.05). Sleep log-derived IIV changes were modestly correlated with mean-level PSQI and PSG-based changes at 12months. Twelve months of moderate-intensity exercise reduced night-to-night fluctuations in self-rated time to fall asleep, and this relationship was independent of mean-level time to fall asleep.
AB - Sleep interventions have rarely explored reductions in night-to-night fluctuations [i.e. intra-individual variability (IIV)] in sleep, despite the negative impacts of such fluctuations on affective states and cognitive and physical symptoms. In a community-based randomized controlled trial we evaluated whether physical exercise reduced IIV in self-rated sleep outcomes among middle-aged and older adults with sleep complaints. Under-active adults 55years and older (n=66, 67% women) with mild to moderate sleep complaints were randomized to 12 months of a moderate-intensity endurance exercise (n=36) or a health education control group (n=30). Daily sleep logs, Pittsburgh Sleep Quality Index (PSQI) and in-home polysomnographic sleep recordings (PSG) were collected at baseline, 6months and 12months. Sleep log-derived means and IIV were computed for sleep-onset latency (SOL), time in bed, feeling rested in the morning, number of nighttime awakenings, and wake after final awakening (WAFA). Using intent-to-treat methods, at 6months no differences in IIV were observed by group. At 12months, SOL-based IIV was reduced in the exercise group compared with the control (difference=23.11, 95% CI: 3.04-47.18, P=0.025, Cohen's d=0.57). This change occurred without mean-level or IIV changes in sleep-wake schedules. For all sleep variables, except SOL and WAFA, IIV changes and mean-level changes in each variable were negatively correlated (r=-0.312 to -0.691, P<0.05). Sleep log-derived IIV changes were modestly correlated with mean-level PSQI and PSG-based changes at 12months. Twelve months of moderate-intensity exercise reduced night-to-night fluctuations in self-rated time to fall asleep, and this relationship was independent of mean-level time to fall asleep.
KW - Intervention
KW - Intra-individual variability
KW - Physical activity
KW - Sleep
KW - Sleep-onset latency
KW - Unpredictability
UR - http://www.scopus.com/inward/record.url?scp=79751476282&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79751476282&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2869.2010.00866.x
DO - 10.1111/j.1365-2869.2010.00866.x
M3 - Article
C2 - 20629937
AN - SCOPUS:79751476282
VL - 20
SP - 28
EP - 37
JO - Journal of Sleep Research
JF - Journal of Sleep Research
SN - 0962-1105
IS - 1 PART I
ER -