Exercise and cardiovascular load in workers with high occupational physical activity

Area of Science:

• Occupational Health
• Cardiovascular Physiology
• Exercise Science

Background:

• High occupational physical activity (OPA) jobs, like mail delivery, can impact cardiovascular health.
• Understanding the interplay between work demands, exercise, and cardiovascular load is crucial for worker well-being.

Purpose of the Study:

• To investigate the association between regular exercise and cardiovascular load in Korean mail carriers.
• To determine if exercise mitigates the cardiovascular strain associated with high OPA.

Main Methods:

• 36 Korean mail carriers participated, completing questionnaires and wearing heart rate monitors for 3 days.
• Maximal oxygen uptake (VO2max) was assessed using treadmill tests.
• Multiple regression analysis was employed to analyze the relationship between working hours, exercise, and relative heart rate (RHR).

Main Results:

• Subjects exhibited a mean relative heart rate (RHR) of 25.6%, exceeding the recommended 24.5%.
• Average daily working hours (11.1) surpassed the acceptable limit (7.8).
• Increased working hours correlated positively with RHR, while exercise showed no significant association.

Conclusions:

• Exercise may not provide significant cardiovascular benefits for individuals engaged in high OPA.
• The demanding work hours of mail carriers appear to be a primary driver of elevated cardiovascular load.
• Exercise interventions for high OPA workers should be carefully considered and potentially adapted to their specific work environment.