Table 2. Mean and standard deviation of HRV indexes and blood pressure (BP) at baseline before and after 8-weeks of HIIE plus strength exercise.
| Variables |
HSG (n = 11) |
CG (n = 10) |
| Mean RR |
Pre |
907.9 ± 106.4 |
969.3 ± 159.4 |
| Post |
978.8 ± 115.7 * |
937.7 ± 129.2 |
| Mean HR (beat/min) |
Pre |
67.3 ± 7.5 |
63.8 ± 9.6 |
| Post |
62.5 ± 7.5 * |
65.5 ± 8.4 |
| SDNN (ms) |
Pre |
71.3 ± 26.9 |
82.0 ± 33.6 |
| Post |
79.6 ± 21.5 |
80.8 ± 29.0 |
| RMSSD (ms) |
Pre |
41.4 ± 20.4 |
62.4 ± 26.7 |
| Post |
47.4 ± 17.6 |
57.6 ± 25.0 |
| LF (nu) |
Pre |
62.5 ± 15.6 † |
46.9 ± 11.4 |
| Post |
64.5 ± 10.1 † |
53.4 ± 15.5 |
| HF (nu) |
Pre |
37.4 ± 15.6 † |
52.9 ± 11.4 |
| Post |
35.4 ± 10.1 † |
46.5 ± 15.5 |
| LF (ms²) |
Pre |
1023.1 ± 821.7 |
1261.8 ± 881.1 |
| Post |
1396.6 ± 942.8 |
1046.4 ± 899.6 |
| HF (ms²) |
Pre |
743.9 ± 937.2 |
1063.6 ± 744.2 |
| Post |
788.1 ± 615.9 |
1182.2 ± 728.1 |
| LF/HF |
Pre |
1.3 ± 0.8 |
1.1 ± 1.1 |
| Post |
1.7 ± 1.5 |
0.8 ± 1.2 |
| SBP (mmHg) |
Pre |
122.8 ± 11.3 |
124.9 ± 6.8 |
| Post |
118.7 ± 9.4 |
125.2 ± 5.9 |
| DBP (mmHg) |
Pre |
62.3 ± 5.6 |
65.0 ± 6.6 |
| Post |
62.9 ± 5.4 |
67.1 ± 5.8 |
Mean ± standard deviation. Mean HR = mean hear rate; Mean RR = mean RR intervals; SDNN = standard deviation of all normal RR intervals written in milliseconds; RMSSD = square root of the square mean of the differences of the adjacent normal RR intervals, in milliseconds; LF ms² = low-frequency component in milliseconds squared; LF nu = low frequency component in unit of measurement; HF ms² = high-frequency component in milliseconds squared; HF nu = high-frequency component in unit of measurement; LF/HF = balance between the low and high frequency component; beat/min = beat per minute; SBP = systolic blood pressure; DBP = diastolic blood pressure; mmHg = millimetres of mercury; HSG = high intensity aerobic exercise combined strength group; CG = control group; Pre = pre-training; Post = post-training;* = significant difference compared with the pre-training moment (p < 0.05);† = significant difference compared with the control group (p < 0.05).
