Early Effects of Long-Term Neurotoxic Lead Exposure in Copper Works Employees

Table 2

Comparison of a number of cardiovascular parameters of lead-exposed subjects (E) involving the subgroups of high-exposed (hE) and low-exposed (lE), and controls (C) at rest and during recovery.

Physiological strain data	Exposed (E)	Controls (C)	High exposed (hE)	Low exposed (lE)	𝑃 (E-C)	𝑃 (hE-C)	𝑃 (lE-C)
HR rest (1/min)	67.1±10.9	75.2±11.7	64.4±10.9	68.3±10.7	.002	.003	.015
SAa rest (ms)	29.6±17.6	16.0±16.6	34.1±21.2	27.5±15.5	.001	.002	.005
LF (%) rest	49.9±15.8	62.7±16.1	48.7±14.6	50.5±16.4	.001	.005	.004
HF (%) rest	36.2±17.4	18.3±15.3	35.8±16.4	36.4±18.0	<.001	.001	<.001
HR recovery (1/min)	69.6±9.1	74.8±13.1	67.6±10.4	70.5±8.5	.068	.045	.137
SAa recovery (ms)	25.7±12.9	17.8±13.9	26.7±14.6	25.3±12.2	.010	.037	.019
HF Recovery (ms^2)	4067.5±3545.7	1627.5±2789.7	3885.5±3673.1	4152.4±3523.7	.001	.019	.001
HF (%) Recovery	34.5±23.9	19.9±17.7	30.5±23.2	36.3±24.3	.002	.079	.002