Article Title



Meral N. Culver, Braxton A. Linder, McKenna A. Tharpe, Alex M. Barnett, Zach J. Hutchison, Austin T. Robinson. Auburn University, Auburn, AL.

BACKGROUND: Insufficient sleep is associated with hypertension, the leading risk factor for cardiovascular disease. Blood pressure (BP) responses to physical stressors such as exercise, have prognostic value in predicting future hypertension risk. However, it is unclear whether sleep is associated with BP responses to physical stressors. Thus, the present investigation sought to assess the relation between habitual sleep quality and BP responses during isometric handgrip (HG). METHODS: A total of 49 healthy adults (30 female, age: 23.0±3.3 yrs, BMI: 25.5±3.8 kg/m2, resting BP: 107±10 mmHg, Mean±SD) participated in this study. Objective sleep quality, including sleep duration and efficiency, were assessed using wrist-worn Philips Actiwatch Spectrum PLUS accelerometers. Participants wore the devices for a minimum of a six-day observation period (7.4±0.8 days). Maximal HG force was obtained by calculating the average of three maximal voluntary contractions (MVC). Beat-to-beat BP via finger photoplethysmography (Finometer) and heart rate (electrocardiogram) were continuously assessed during a 10-minute baseline and a two-minute HG at 40% MVC. We split participants into quartiles based on the sleep duration and efficiency, respectively. Statistical analyses included Pearson’s correlation and ANOVA, and significance was set as p<0.05. RESULTS: There were no associations between sleep duration or efficiency and peak (minute two) Δ systolic BP, Δ diastolic BP, or Δ mean BP (p>0.05 for each). Although there was a large difference between quartiles, for sleep duration (Q1:5.9±0.54hrs, Q2:7.1± 0.3hrs, Q3:7.7 ± 0.1hrs, Q4:8.4 ± 0.6hrs p<0.001), and efficiency (Q1:77±5.0%, Q2:84±1.3%, Q3: 88±1.0%, Q4: 91±1.3%, p<0.001), there were not differences between sleep duration quartile groups for peak Δ systolic BP (Q1: 36±14, Q2: 31±24, Q3: 33±16, Q4: 36±15 mmHg, p=0.467), Δ diastolic BP, or Δ mean BP (data not shown, p>0.05 for both). Also, there were no differences between sleep efficiency quartile groups for peak Δ systolic BP, Δ diastolic BP, or Δ mean BP during HG (p>0.05 for each). CONCLUSION: These preliminary data indicate that actigraphy-derived habitual sleep duration and efficiency do not appear to be associated with BP responses to HG exercise in healthy adults. ACKNOWLEDGEMENTS: Funding for this project was provided by NIH grants K01HL147998 and UL1TR003096 (CCTS Pilot), and the 2020 Auburn University School of Kinesiology Seed Funding Competition.

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