Table 8.

The difference of heart rate variability between groups

HRV	Group	Result
		Before intake	After intake	After exercise
SDNN (ms)	CON	68.52±26.77	70.79±33.58	14.27±4.96
	ECG I	62.71±20.84	54.00±17.51	11.70±3.53
	ECG II	43.20±12.72	63.15±20.10	10.04±4.19
RMSSD (ms)	CON	62.06±37.65	53.19±22.68	4.90±2.07
	ECG I	61.27±20.71	58.60±22.71	4.23±0.85
	ECG II	31.61±13.97	46.61±19.29	4.00±1.03
TP (ms2)	CON	8.01±0.97	8.28±10.5	4.46±0.98
	ECG I	8.05±0.78	7.56±0.52	4.00±0.41
	ECG II	6.83±1.00	7.93±0.85	3.55±0.42
VLF (ms2)	CON	7.18±0.81	7.27±0.68	4.03±0.91
	ECG I	7.28±1.04	6.28±1.33	3.58±0.48
	ECG II	5.76±0.89	7.17±1.43	3.26±0.67
LF (ms2)	CON	6.43±0.98	7.43±1.42	3.08±1.37
	ECG I	6.65±0.59	6.20±0.23	2.53±0.52
	ECG II	5.62±1.29	6.09±0.79	1.89±0.65
HF (ms2)	CON	6.67±6.44	6.16±0.74	1.47±0.66
	ECG I	6.44±1.10	6.27±0.78	1.04±0.56
	ECG II	5.35±1.24	6.23±0.80	0.68±0.47
LF Norm	CON	46.00±25.29	74.73±14.48	84.92±9.49
	ECG I	54.29±21.62	48.21±21.96	84.27±8.01
	ECG II	56.26±19.09	47.86±23.34	78.49±8.27
HF Norm	CON	25.23±11.28	25.27±14.48	15.08±9.50
	ECG I	45.71±21.62	51.79±22.00	15.73±8.01
	ECG II	43.74±19.09	52.14±23.34	21.51±8.27
LF/HF ratio	CON	1.26±1.16	2.61±1.13	5.40±4.38
	ECG I	1.76±1.60	1.32±1.22	4.36±1.79
	ECG II	1.68±1.17	1.25±0.96	4.40±2.47

Values are Mean ± Standard deviation

CON : control group, ECG I: energy drink 1.25 mg/kg^-1 consumption group, ECG II: energy drink 2.5 mg/kg^-1 consumption group