Table 2.

The influence of time-on-task (8 samples) and group (men, FO, and LU) on heart rate and heart rate variability. Significant differences are in bold.

HRV parameter		Time-on-task			Group
	F	P	η 2	Direction	F	P	η 2
HR, beats/min	21.96	<0.001	0.37	↓	0.43	0.65	0.02
SDNN, msSDNN, ms	11.25	<0.001	0.23	↑	1.86	0.17	0.09
RMSSD, ms	7.06	<0.001	0.16	↑	1.49	0.24	0.07
Total power, ms2	6.39	<0.001	0.15	↑	1.70	0.20	0.08
LF, ms2	6.16	<0.001	0.14	↑	1.81	0.18	0.09
HF, ms2	3.38	0.002	0.08	↑	0.54	0.58	0.03
LFnorm, n.u.	3.78	<0.001	0.09	↑	0.24	0.79	0.01
HFnorm, n.u.	3.66	<0.001	0.09	↓	0.24	0.79	0.01
LF/HF ratio	3.41	0.010	0.09	↑	1.14	0.33	0.06

HR: heart rate, SDNN: standard deviation of the RRIs, RMSSD: the square root of the mean squared successive heart period differences, HF: high frequency component, LF: low frequency component, LFnorm: normalized LF, and HFnorm: normalized HF.