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Table 2 HRV indices recorded at different altitudes

From: Effects of acute hypoxia on heart rate variability, sample entropy and cardiorespiratory phase synchronization

 

SL

3000 m

4000 m

LF(ms2)

623 ± 290

427 ± 192

253 ± 137 ¶

HF(ms2)

754 ± 649

473 ± 517

177 ± 266 §

LF/HF

1.2 ± 0.8

1.9 ± 1.7

2.7 ± 1.3 ‡

SampEn

1.7 ± 0.1

1.8 ± 0.1 †

1.9 ± 0.1 †

  1. ¶ Significantly decreased compared with the value at SL (P < 0.001) and 3000 m (P = 0.008).
  2. § Significantly reduced compared to the value at SL (P < 0.001) and 3000 m (P = 0.007).
  3. ‡ Significantly increased from SL to 4000 m (P = 0.006), but there was no significant difference between SL and 3000 m (P = 0.062), neither between 3000 m and 4000 m (P = 0.321).
  4. † Significantly increased compared with the value at SL (P = 0.004 at 3000 m and P < 0.001 at 4000 m). However, there was no significant difference between 3000 m and 4000 m (P = 0.127).
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