Abstract
ObjectivesOccupational groups exposed to high occupational physical activity have an increased risk for cardiovascular disease (CVD). This may be explained by the high relative aerobic workload. Enhanced cardiorespiratory fitness reduces the relative aerobic workload. Thus, the aim was to evaluate the 12-months effects of worksite aerobic exercise on risk factors for CVD among cleaners.MethodsOne hundred and sixteen cleaners aged 18–65 years were randomized to a group performing aerobic exercise and a reference group receiving lectures. Outcomes were collected at baseline and after 12-months. A repeated measures 2×2 multi-adjusted mixed-model design was applied to compare the between-group differences using intention-to-treat analysis.ResultsBetween-group differences (p<0.05) were found favouring the aerobic exercise group: cardiorespiratory fitness 2.15 (SE 1.03) mlO2/min/kg, aerobic workload -2.15 (SE 1.06) %HRR, resting HR -5.31 (SE 1.61) beats/min, high sensitive C-reactive protein -0.65 (SE 0.24) μg/ml. The blood pressure was unaltered. Stratified analyses on relative aerobic workload at baseline revealed that those with relative aerobic workloads ≥30% of HRR seems to impose a notable adverse effect on resting and ambulatory blood pressure.ConclusionThis long-term worksite aerobic exercise intervention among cleaners led to several beneficial effects, but also potential adverse effects among those with high relative aerobic workloads.Trial RegistrationControlled-Trials.com ISRCTN86682076
Highlights
Individuals exposed to high occupational physical activity (OPA) suffer from an elevated incidence of cardiovascular disease (CVD) [1]
high density lipoprotein (HDL), High density lipoprotein; HR, Heart rate; HRmax, Maximum heart rate; HR reserve (HRR), Heart rate reserve; % HRR, Percentage of heart rate reserve; high sensitive C-reactive protein (hsCRP), High sensitive C-reactive protein; intention to treat principle (ITT), Intention to treat; low density density lipoprotein (LDL), Low density lipoprotein; LTPA, Leisure time physical activity; OPA, Occupational physical activity; resting heart rate (RHR), Resting heart rate; sleeping heart rate (SHR), Sleeping heart rate; VO2max, Maximum oxygen consumption. This long-term worksite aerobic exercise intervention among cleaners led to several beneficial effects, and potential adverse effects among those with high relative aerobic workloads
At 4-months follow-up the analysis showed that the cardiorespiratory fitness was enhanced, and the aerobic workload during cleaning, resting heart rate (RHR), sleeping heart rate (SHR) [10] and level of inflammation evaluated by high sensitive C-reactive protein were reduced [22]
Summary
Occupational groups exposed to high occupational physical activity have an increased risk for cardiovascular disease (CVD). This may be explained by the high relative aerobic workload. Enhanced cardiorespiratory fitness reduces the relative aerobic workload. The aim was to evaluate the 12-months effects of worksite aerobic exercise on risk factors for CVD among cleaners. Data Availability Statement: All relevant data are within the paper and its Supporting Information files
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
