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

Table 5 Multiple logistic regressions between heart rate variability items (low vs. normal) and age and occupational physical activity adjusting exercise and other covariates

		SDNN			rMSSD			LF			HF			LF:HF
Covariates		OR	95% CI		OR	95% CI		OR	95% CI		OR	95% CI		OR	95% CI
			lower	higher		lower	higher		lower	higher		lower	higher		lower	higher
Age and OPA
	Age < 45 and low OPA	1.0			1.0			1.0			1.0			1.0
	Age < 45 and high OPA	0.6	0.2	1.7	0.6	0.1	3.3	0.7	0.3	1.7	0.6	0.1	2.3	1.1	0.4	2.9
	Age ≥ 45and lower OPA	1.9	0.4	9.5	<0.1	<0.1	>99.9	1.9	0.4	8.5	1.2	0.1	12.5	3.1	0.6	16.6
	Age ≥ 45and high OPA	10.0	0.7	136.0	64.0	2.9	>99.9	4.2	0.3	51.4	18.5	1.3	259.8	<0.1	<0.1	>99.9
Exercise (frequency / week)
	< 3	1.0			1.0			1.0			1.0			1.0
	≥3	0.7	0.4	1.4	0.2	0.0	0.8	0.7	0.4	1.4	0.5	0.2	1.3	0.9	0.5	1.8
Body mass index (kg/m²)
	Normal (20 - 25)													1.0
	Abnormal													3.1	1.1	8.6
Alcohol drinking (frequency / week)
	<2							1.0						1.0
	≥2							1.7	0.7	4.2				1.4	0.5	3.6
Shift work
	No													1.0
	Yes													3.4	1.2	9.2
Social support
	Low	1.0												1.0
	High	0.3	0.1	0.9										1.9	0.8	4.5

SDNN the standard deviation of normal-to-normal intervals, rMSSD the root-mean square of the difference of successive normal R-R intervals, LF low frequency band power, HF high frequency band power, LF:HF ratio of low-frequency power to high-frequency power, CI confidence interval, OPA occupational physical activity

ISSN: 2052-4374