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. 2014 Jun 11;13:73. doi: 10.1186/1475-925X-13-73

Table 2.

HRV indices recorded at different altitudes

  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 †

¶ Significantly decreased compared with the value at SL (P < 0.001) and 3000 m (P = 0.008).

§ Significantly reduced compared to the value at SL (P < 0.001) and 3000 m (P = 0.007).

‡ 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).

† 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).