Associations between occupational relative aerobic workload and resting blood pressure among different age groups

a cross-sectional analysis in the DPhacto study

Mette Korshøj, Els Clays, Niklas Krause, Nidhi Gupta, Marie Birk Jørgensen, Andreas Holtermann

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

OBJECTIVE: High levels of occupational physical activity (OPA) increase heart rate, blood pressure (BP) and the risk of hypertension. Older workers may be more vulnerable to high levels of OPA due to age-related degeneration of the cardiovascular system and cardiorespiratory fitness. This study investigates the association of relative aerobic workload (RAW) with resting BP and examines if this relation is moderated by age. DESIGN: Cross-sectional epidemiological study. SETTING: Data were collected among employees of 15 Danish companies in the cleaning, manufacturing and transport sectors. PARTICIPANTS: 2107 employees were invited for participation, of these 1087 accepted and 562 (42% female and 4% non-Westerns) were included in the analysis based on the criteria of being non-pregnant, no allergy to bandages, sufficient amount of heart rate data corresponding to ≥4 work hours per workday or 75% of average work hours, and no missing outcome and confounder values. PRIMARY AND SECONDARY OUTCOME MEASURES: The primary outcome measure was BP. RESULTS: Heart rate reserve was estimated from ambulatory 24-hour heart rate measures covering 2.5 workdays per participant (SD 1.0 day). Age significantly moderated the association between RAW and BP. Mean intensity and duration of high RAW (≥30% heart rate reserve) showed positive associations with diastolic BP and negative associations with pulse pressure (PP) among participants ≥47 years old. Tendencies towards negative associations between RAW and BP were seen among participants <47 years old. CONCLUSIONS: Mean intensity and duration of RAW increased diastolic BP among participants ≥47 years old. Negative associations with PP may be due to healthy worker selection bias. Prevention of hypertension should consider reductions in RAW for ageing workers.

Original languageEnglish
Article numbere029713
JournalBMJ Open
Volume9
Issue number9
Number of pages8
ISSN2044-6055
DOIs
Publication statusPublished - 24. Sep 2019

Fingerprint

Workload
Age Groups
Cross-Sectional Studies
Outcome Assessment (Health Care)
Exercise
Selection Bias
Epidemiologic Studies
Hypersensitivity

Keywords

  • cardiovascular risk factor
  • HR reserve
  • hypertension
  • occupational physical activity
  • physical workload

Cite this

Korshøj, Mette ; Clays, Els ; Krause, Niklas ; Gupta, Nidhi ; Jørgensen, Marie Birk ; Holtermann, Andreas. / Associations between occupational relative aerobic workload and resting blood pressure among different age groups : a cross-sectional analysis in the DPhacto study. In: BMJ Open. 2019 ; Vol. 9, No. 9.
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title = "Associations between occupational relative aerobic workload and resting blood pressure among different age groups: a cross-sectional analysis in the DPhacto study",
abstract = "OBJECTIVE: High levels of occupational physical activity (OPA) increase heart rate, blood pressure (BP) and the risk of hypertension. Older workers may be more vulnerable to high levels of OPA due to age-related degeneration of the cardiovascular system and cardiorespiratory fitness. This study investigates the association of relative aerobic workload (RAW) with resting BP and examines if this relation is moderated by age. DESIGN: Cross-sectional epidemiological study. SETTING: Data were collected among employees of 15 Danish companies in the cleaning, manufacturing and transport sectors. PARTICIPANTS: 2107 employees were invited for participation, of these 1087 accepted and 562 (42{\%} female and 4{\%} non-Westerns) were included in the analysis based on the criteria of being non-pregnant, no allergy to bandages, sufficient amount of heart rate data corresponding to ≥4 work hours per workday or 75{\%} of average work hours, and no missing outcome and confounder values. PRIMARY AND SECONDARY OUTCOME MEASURES: The primary outcome measure was BP. RESULTS: Heart rate reserve was estimated from ambulatory 24-hour heart rate measures covering 2.5 workdays per participant (SD 1.0 day). Age significantly moderated the association between RAW and BP. Mean intensity and duration of high RAW (≥30{\%} heart rate reserve) showed positive associations with diastolic BP and negative associations with pulse pressure (PP) among participants ≥47 years old. Tendencies towards negative associations between RAW and BP were seen among participants <47 years old. CONCLUSIONS: Mean intensity and duration of RAW increased diastolic BP among participants ≥47 years old. Negative associations with PP may be due to healthy worker selection bias. Prevention of hypertension should consider reductions in RAW for ageing workers.",
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doi = "10.1136/bmjopen-2019-029713",
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Associations between occupational relative aerobic workload and resting blood pressure among different age groups : a cross-sectional analysis in the DPhacto study. / Korshøj, Mette; Clays, Els; Krause, Niklas; Gupta, Nidhi; Jørgensen, Marie Birk; Holtermann, Andreas.

In: BMJ Open, Vol. 9, No. 9, e029713, 24.09.2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Associations between occupational relative aerobic workload and resting blood pressure among different age groups

T2 - a cross-sectional analysis in the DPhacto study

AU - Korshøj, Mette

AU - Clays, Els

AU - Krause, Niklas

AU - Gupta, Nidhi

AU - Jørgensen, Marie Birk

AU - Holtermann, Andreas

PY - 2019/9/24

Y1 - 2019/9/24

N2 - OBJECTIVE: High levels of occupational physical activity (OPA) increase heart rate, blood pressure (BP) and the risk of hypertension. Older workers may be more vulnerable to high levels of OPA due to age-related degeneration of the cardiovascular system and cardiorespiratory fitness. This study investigates the association of relative aerobic workload (RAW) with resting BP and examines if this relation is moderated by age. DESIGN: Cross-sectional epidemiological study. SETTING: Data were collected among employees of 15 Danish companies in the cleaning, manufacturing and transport sectors. PARTICIPANTS: 2107 employees were invited for participation, of these 1087 accepted and 562 (42% female and 4% non-Westerns) were included in the analysis based on the criteria of being non-pregnant, no allergy to bandages, sufficient amount of heart rate data corresponding to ≥4 work hours per workday or 75% of average work hours, and no missing outcome and confounder values. PRIMARY AND SECONDARY OUTCOME MEASURES: The primary outcome measure was BP. RESULTS: Heart rate reserve was estimated from ambulatory 24-hour heart rate measures covering 2.5 workdays per participant (SD 1.0 day). Age significantly moderated the association between RAW and BP. Mean intensity and duration of high RAW (≥30% heart rate reserve) showed positive associations with diastolic BP and negative associations with pulse pressure (PP) among participants ≥47 years old. Tendencies towards negative associations between RAW and BP were seen among participants <47 years old. CONCLUSIONS: Mean intensity and duration of RAW increased diastolic BP among participants ≥47 years old. Negative associations with PP may be due to healthy worker selection bias. Prevention of hypertension should consider reductions in RAW for ageing workers.

AB - OBJECTIVE: High levels of occupational physical activity (OPA) increase heart rate, blood pressure (BP) and the risk of hypertension. Older workers may be more vulnerable to high levels of OPA due to age-related degeneration of the cardiovascular system and cardiorespiratory fitness. This study investigates the association of relative aerobic workload (RAW) with resting BP and examines if this relation is moderated by age. DESIGN: Cross-sectional epidemiological study. SETTING: Data were collected among employees of 15 Danish companies in the cleaning, manufacturing and transport sectors. PARTICIPANTS: 2107 employees were invited for participation, of these 1087 accepted and 562 (42% female and 4% non-Westerns) were included in the analysis based on the criteria of being non-pregnant, no allergy to bandages, sufficient amount of heart rate data corresponding to ≥4 work hours per workday or 75% of average work hours, and no missing outcome and confounder values. PRIMARY AND SECONDARY OUTCOME MEASURES: The primary outcome measure was BP. RESULTS: Heart rate reserve was estimated from ambulatory 24-hour heart rate measures covering 2.5 workdays per participant (SD 1.0 day). Age significantly moderated the association between RAW and BP. Mean intensity and duration of high RAW (≥30% heart rate reserve) showed positive associations with diastolic BP and negative associations with pulse pressure (PP) among participants ≥47 years old. Tendencies towards negative associations between RAW and BP were seen among participants <47 years old. CONCLUSIONS: Mean intensity and duration of RAW increased diastolic BP among participants ≥47 years old. Negative associations with PP may be due to healthy worker selection bias. Prevention of hypertension should consider reductions in RAW for ageing workers.

KW - cardiovascular risk factor

KW - HR reserve

KW - hypertension

KW - occupational physical activity

KW - physical workload

U2 - 10.1136/bmjopen-2019-029713

DO - 10.1136/bmjopen-2019-029713

M3 - Journal article

VL - 9

JO - B M J Open

JF - B M J Open

SN - 2044-6055

IS - 9

M1 - e029713

ER -