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Abstract Number: 1335

Early Birds Versus Night Owls: Morning/Evening Preference and Its Association with Sleep Problems, Fatigue, and Emotional Well-Being Among RA Patients

Alyssa Wohlfahrt1, Jing Cui2, Michelle A. Frits3, Christine K. Iannaccone4, Jonathan S. Coblyn5, Michael E. Weinblatt6, Nancy A. Shadick7 and Yvonne C. Lee4, 1Brigham and Women's Hospital, Boston, MA, 2Rheumatology, Brigham and Womens Hospital, Boston, MA, 3Division of Rheumatology, Brigham and Women's Hospital, Boston, MA, 4Department of Medicine, Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA, 5Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA, 6Division of Rheumatology & Immunology, Brigham and Women's Hospital, Boston, MA, 7Brigham and Women's Hospital/Harvard University, Cambridge, MA

Meeting: 2014 ACR/ARHP Annual Meeting

Keywords: rheumatoid arthritis (RA) and sleep

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Session Information

Session Title: Psychology/Social Sciences (ARHP)

Session Type: Abstract Submissions (ARHP)

Background/Purpose: Over 60% of rheumatoid arthritis (RA) patients report sleep problems. Previous studies suggest that chronotype (the preferred time of day when individuals are active and alert), sleep problems, pain and emotional well-being are intimately linked. In the normal population, evening chronotype (preference for activity in the evenings) is associated with poor sleep, pain, and depression. This study examines the association between chronotypes and measures of sleep, pain and emotional well-being among RA patients with sleep problems.

Methods: Cross-sectional data were analyzed from 191 RA patients who participated in a substudy on sleep and morning/evening preference, within a large RA registry. Inclusion criteria included RA patients with sleep problems (Medical Outcomes Study (MOS) Sleep Problems Index II score > 35). Between March and June 2012, subjects were mailed the Horne-Ostberg Morningness-Eveningness Questionnaire (MEQ). The Multidimensional Health Assessment Questionnaire (MDHAQ), the 5-item Mental Health Index (MHI-5) and the MOS Sleep Scale were completed during the subjects’ annual study visit. Multivariable linear regression models, adjusted for age, sex, serology, and disease activity (DAS28-CRP), were used to determine the association between chronotype and sleep problems, pain and emotional well-being. Scores for morning and intermediate chronotypes were compared to scores for evening chronotypes.

Results: Mean age was 61.0 ± 11.3 years. 162 (84.8%) were female. Mean DAS28-CRP was 2.90 ± 1.29. 43 (22.5%) exhibited a morning preference. 67 (35.1%) exhibited an evening preference, and 81 (42.4%) were intermediate chronotypes. Evening chronotypes reported significantly longer sleep duration (6.8 hours vs. 6.1 hours, p = 0.01) than intermediate chronotypes (Table). Although not statistically significant, evening chronotypes reported the lowest sleep adequacy scores (34.5 vs. 37.1 for intermediate and 41.9 for morning chronotypes) and the highest somnolence scores (34.4 vs. 31.8 for intermediate and 28.9 for morning chronotypes). Evening chronotypes also had the lowest mean scores on the MHI-5 (69.3 vs. 71.6 for intermediate and 77.3 for morning chronotypes). Both morning and evening chronotypes had similar scores on the MOS Sleep Disturbance Scale (45.0 versus 45.8), MDHAQ Fatigue Scale (53.6 vs. 53.0) and MDHAQ Pain Scale (40.6 vs. 37.5).

Conclusion: In contrast to the general population, RA patients with an evening preference did not report worse emotional health or higher pain and fatigue, compared to intermediate or morning chronotypes. RA patients with evening chronotypes did report sleeping more hours than subjects with morning or intermediate chronotypes, despite similar sleep adequacy scores. Additional studies are needed to determine whether morning/evening preference can be used to identify subgroups of RA patients at increased risk for sleep problems.

Table. Adjusted mean values for sleep, fatigue, pain and emotional well-being among RA patients with clinically significant sleep problems.

Clinical Characteristic

Morning*

(N = 43)

Intermediate*

(N = 81)

Evening

(N = 67)

Sleep Quantity (hours)

6.4

(p=0.26)

6.1

(p=0.01)

6.8

Sleep Adequacy

(0-100 scale, higher = better sleep adequacy)

41.9

(p=0.11)

37.1

(p=0.49)

34.5

Somnolence Scale

(0-100 scale, higher = more somnolence)

28.9

(p=0.25)

31.8

(p=0.51)

34.4

Sleep Disturbance Scale

(0-100 scale, higher = more disturbance)

45.0

(p=0.86)

48.5

(p=0.52)

45.8

MDHAQ Fatigue Scale

(0-100 scale, higher = more fatigue)

53.6

(p=0.93)

52.2

(p=0.87)

53.0

MDHAQ Pain Scale

(0-100 scale, higher = more pain)

40.6

(p=0.60)

39.7

(p=0.65)

37.5

Mental Health Index – 5

(0-100 scale, higher = better emotional well-being)

77.3

(p=0.07)

71.6

(p=0.51)

69.3

*P values are for comparison between morning chronotypes and evening chronotypes and the comparison between intermediate chronotypes and evening chronotypes.


Disclosure:

A. Wohlfahrt,
None;

J. Cui,
None;

M. A. Frits,
None;

C. K. Iannaccone,
None;

J. S. Coblyn,

CVS caremark,

5;

M. E. Weinblatt,

UCB,

2,

Bristol-Myers Squibb,

2,

Crescendo,

2,

UCB,

5,

Bristol-Myers Squibb,

5,

Crescendo,

5;

N. A. Shadick,

Crescendo Bioscience,

2,

Amgen,

2,

UCB,

2,

Abbvie,

2,

Bristol Myers Squibb,

2,

Genentech ,

2;

Y. C. Lee,

Forest Research Institute,

2,

Merck Pharmaceuticals,

1,

Cubist Pharmaceuticals,

1,

Perrigo,

1,

Express Scripts,

1.

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