Table 1 Overall effect of overload intervention on heart rate and heart rate variability

Categories	n	Overall SMD, mean (95% CI)	p Value
HR
Rest	244	0.18 (−0.02 to 0.38)	0.07
Submaximal exercise	193	−0.27 (−0.50 to −0.03)	0.03
Maximal exercise	189	−0.38 (−0.59 to −0.17)	0.0003
HRV
LH+HF	83	−0.32 (−0.67 to 0.04)	0.08
LF/HF	76	0.41 ((0.08 to 0.73)	0.01

HR, heart rate; HRV, heart rate variability; HF, high frequency; LF, low frequency; SMD, standardised mean difference.