Relationship between long sleep duration and functional capacities in postmenopausal women.
OBJECTIVE
The purpose of the present study was to examine the relationship between long sleep duration and functional capacities.


METHODS
We conducted a cross-sectional study at the Department of Kinanthropology at the University of Quebec at Montreal. Forty eight non-frail postmenopausal women aged between 49 to 75 years were recruited using advertisements in local papers. Body weight, body mass index, fat mass, skeletal muscle mass, number of steps per day, SF-36 total (healthy questionnaire), resting metabolic rate, total energy intake, sleep duration, knee extensor strength (dynamometer), chair stand test and balance opened eyes test were measured.


RESULTS
WE FOUND A SIGNIFICANT NEGATIVE CORRELATION BETWEEN HOURS OF SLEEP AND FUNCTIONAL CAPACITY: chair stand test (r = -0.33, p = 0.02), balance opened eyes test (r = -0.45, p = 0.001), muscle strength (r = -0.43, p = 0.002) and skeletal muscle mass (r = -0.39, p = 0.007). In addition, long sleepers (> 9 h) had significantly lower values for skeletal muscle mass (p = 0.03), muscle strength (p = 0.01), chair stand test (p = 0.03), and balance opened eyes test (p = 0.001). Finally, linear regression analysis showed that sleep duration was an independent predictor of the chair stand test (p = 0.024), balance opened eyes test (p = 0.001), and muscle strength (p = 0.035) in our cohort.


CONCLUSIONS
Long sleepers were associated with lower functional capacities in our cohort of sedentary postmenopausal women.
Faculty of Science, Department of Kinanthropology, University of Quebec at Montreal, Montreal, Canada.
Annie
A
Fex
Sébastien
S
Barbat-Artigas
Sophie
S
Dupontgand
Marie-Eve
ME
Filion
Antony D
AD
Karelis
Mylène
M
Aubertin-Leheudre
D000203:Activities of Daily Living; D000368:Aged; D015992:Body Mass Index; D001835:Body Weight; D003430:Cross-Sectional Studies; D005260:Female; D006304:Health Status; D006801:Humans; D008875:Middle Aged; D053580:Muscle Strength; D053581:Muscle Strength Dynamometer; D012890:Sleep / Q000502:physiology; D011795:Surveys and Questionnaires; D013997:Time Factors