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. 2020 Feb 11;15(2):e0228638.
doi: 10.1371/journal.pone.0228638. eCollection 2020.

Hyperkyphosis and self-reported and objectively measured sleep quality in older men

Christopher N Kaufmann  1   2 , Jian Shen  2 , Gina N Woods  3 , Nancy E Lane  4 , Katie L Stone  5 , Deborah M Kado  2 ; Osteoporotic Fractures in Men (MrOS) Study Research Group
Affiliations

Hyperkyphosis and self-reported and objectively measured sleep quality in older men

Christopher N Kaufmann et al. PLoS One. .

Abstract

Objectives: Hyperkyphosis is associated with restricted pulmonary function and posture, potentially contributing to poor sleep. A previous study reported older women with hyperkyphosis had worse self-reported sleep quality, but it is less clear if this association exists in men. We examined the association between hyperkyphosis and subjective and objective sleep quality in a cohort of older men.

Design: Longitudinal analysis of data from large cohort of older men participating in the Osteoporotic Fractures in Men Study (MrOS).

Setting: Community.

Participants: We studied 754 men participants in MrOS who had kyphosis measured during the 3rd clinic visit (2007-2009) and future subjective and objective sleep quality assessed between 2009-2012 (an average of 2.9 years later).

Intervention: N/A.

Measurements: To measure kyphosis, 1.7 cm thick wooden blocks were placed under the participant's head to achieve a neutral spine position while lying supine on a DXA table. We collected data on both subjective (Pittsburgh Sleep Quality Index [PSQI], and Epworth Sleepiness Scale [ESS]) and objective (wrist actigraphy: Total Sleep Time [TST], Wake After Sleep Onset [WASO], Sleep Efficiency [SE], Sleep Onset Latency [SOL]; and polysomnography: Apnea Hypopnea Index [AHI]) sleep measurements. Those who required >3 blocks were considered hyperkyphotic (n = 145 or 19.2%).

Results: In unadjusted and multivariable analyses, men with hyperkyphosis did not report having worse self-reported sleep characteristics based on PSQI and ESS. Similarly, there were no significant associations between hyperkyphosis and objective sleep measures. When examined as a continuous predictor (blocks ranging from 0-8), results were no different.

Conclusions: Although we hypothesized that poor posture in those with hyperkyphosis would interfere with sleep, in this sample of older men, worse kyphosis was not associated with self-reported or objectively measured poor sleep quality.

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Conflict of interest statement

I have read the journal’s policy and the authors of this manuscript have the following competing interests: Dr. Stone has received grant funding from Merck & Co. All other authors report no conflicts of interest. This does not alter our adherence to PLOS ONE policies on sharing data and materials.

Figures

Fig 1
Fig 1. Flow diagram of analysis sample generation.
See this image and copyright information in PMC

References

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