Ann Occup Environ Med.  2015 ;27(1):22. 10.1186/s40557-015-0073-0.

Effects of high occupational physical activity, aging, and exercise on heart rate variability among male workers

• Kang D
• Kim Y
• Kim J
• Hwang Y
• Cho B
• Hong T
• Sung B
• Lee Y

• KMID: 2370868
• DOI: http://doi.org/10.1186/s40557-015-0073-0

Abstract

OBJECTIVES
Effects of aging and leisure time physical activity (LPA) might influence the effect of occupational physical activity (OPA) on risk for cardiovascular disease (CVD). This study was conducted to determine whether OPA affects CVD after controlling the effects of LPA and other risk factors for CVD such as job stress.
METHODS
Participants were 131 male Korean manual workers. Tests for heart rate variability (HRV) were conducted for five minutes in the morning at work. We defined OPA as the combined concept of relative heart rate ratio (RHR), evaluated using a heart rate monitor.
RESULTS
Whereas high OPA was not related to any HRV items in the younger age group, high OPA was associated with an increased number of low-value cases among all HRV items in older workers. Exercise had beneficial effects only in the younger group. After controlling for exercise and other risk factors, the odds ratios of the root-mean square of the difference of successive normal R-R intervals (rMSSD) and high frequency band power (HF) among the older age and high OPA group compared with the younger age and low OPA group were 64.0 and 18.5, respectively. Social support and shift work were independent risk factors in HRV.
CONCLUSIONS
OPA in aging workers increases CVD risks. This study provides support for the need for protection of aging workers from physical work overload, and indicates the need for further study of optimal limits of OPA.

Keyword

Cardiovascular disease; Exhaustion; Social support; Parasympathetic; Relative heart rate ratio; Vagal; Workload; Work limit

MeSH Terms

Aging*
Cardiovascular Diseases
Heart Rate*
Heart*
Humans
Leisure Activities
Male*
Motor Activity*
Odds Ratio
Risk Factors