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Table 4 Changes in VO2max, HRmax and SpO2 at SL and high altitudes (mean ± SD, n = 12)

From: Soldiers’ load carriage performance in high mountains: a physiological study

Parameter SL HA1 HA2 Percentage of decrease (%)
SL vs HA1 SL vs HA2 HA1 vs HA2
VO2max (ml · min−1 · kg−1) 52.6 ± 3.8 44.0 ± 5.7 37.3 ± 4.0 16.4* 29.2* 15.3*
HRmax (beats · min−1) 187.6 ± 10.0 176.3 ± 14.3 174.8 ± 15.4 6.0* 6.8* 0.9
SpO2(%)   91.8 90.9    1.0
  1. *P < 0.05. SL sea level, HA1 high altitude 1, HA2 high altitude 2