Table 2 Summary of studies investigating the effect of hypoxia on substrate utilisation during exercise matched for absolute intensity
From: Response: Commentary on the effects of hypoxia on energy substrate use during exercise
Study | Participants | Study design | Type of hypoxia | Altitude (m) | Duration of exposure | Absolute substrate use (g.min− 1) | Relative substrate use (%) | ||
|---|---|---|---|---|---|---|---|---|---|
CHO oxidation | Fat oxidation | CHO oxidation | Fat oxidation | ||||||
Braun et al. [7] | 15 (females) | 30 min cycling at SL (50% SL VO2max) and hypoxia (65% altitude VO2max) | TA | 4300 | 10 days | SL: 1.38 ± 0.08 CH:1.22 ± 0.09 | NM | NM | NM |
Kelly and Basset [9] | 7 (males) | 60 min exercise at SL (69% SL VO2max) and altitude (78% altitude VO2max) | NH | 2750 | 180 min | SL: 2.27 ± 0.57 AH: 2.30 ± 0.50 | SL: 0.46 ± 0.18 AH: 0.34 ± 0.21 | NM | NM |
Lundby and Van Hall [10] A | 8 (male = 6, female = 2) | 60 min cycling at SL (46% SL VO2max) and at altitude (54% SL VO2max) | NH | 4100 | 70 min | SL: 2.00 ± 0.20 AH: 2.50 ± 0.20 | SL: 0.30 ± 0.01 AH: 0.20 ± 0.01 | SL: 73.90 ± 2.00 AH: 86.20 ± 2.00 | SL: 26.10 ± 2.00 AH: 13.80 ± 2.00 |
Lundby and Van Hall [10] B | 8 (male = 6, female = 2) | 60 min cycling at SL (46% SL VO2max) and at altitude (59% altitude VO2max) | TA | 4100 | 10 days | SL: 2.00 ± 0.20 CH: 2.30 ± 0.10 | SL: 0.30 ± 0.01 CH: 0.20 ± 0.01 | SL: 73.90 ± 2.00 CH: 82.20 ± 2.20 | SL: 26.10 ± 2.00 CH: 17.80 ± 2.20 |
Péronnet et al. [11] | 5 (males) | 80 min cycling at SL (54% SL max) and at altitude (77% altitude VO2max) | HH | 4300 | 110 min | SL: 2.18 ± 0.11 AH:2.67 ± 0.10 | SL: 0.32 ± 0.08 AH: 0.10 ± 0.03 | SL: 75.30 ± 5.20 AH: 92.00 ± 2.10 | SL: 24.70 ± 5.20 AH: 8.00 ± 2.10 |
Van Hall et al. [12] | 6 (male = 5, female = 1) | 20 min cycling at SL (46% SL VO2max) and altitude (82% altitude VO2max) | TA | 5620 | 63 days | SL: 2.22 ± 0.34 CH: 2.31 ± 0.14 | NM | NM | NM |