Table 3.
Energetic contributors to exercise in the moderate, heavy and severe exercise domains
| Time segment | VO2 (ml O2*3min−1) | VO2VM (ml O2*3min−1) | [La−] Equivalent (ml O2*3min−1) | AdjO2Eq (ml O2*3min−1) | VO2gain (ml O2*min−1 * W) |
|---|---|---|---|---|---|
| Severe | |||||
| 0 to 3 min | 5037 ± 1155 | 356 ± 113 | 1182 ± 492 | 5863 ± 1413 | 7.9 ± 1.2 |
| 3 to 6 min | 7096 ± 1509 # | 623 ± 234 # | 588 ± 256 # | 7061 ± 1516 # | 9.5 ± 1.2 # |
| 6 to 9 min | 7780 ± 1573 #* | 729 ± 270 #* | 321 ± 259 #* | 7372 ± 1443 #* | 9.9 ± 1.1 # |
| Heavy | |||||
| 0 to 3 min | 4062 ± 1184 | 216 ± 62 | 452 ± 254 | 4278 ± 1074 | 7.5 ± 1.1 |
| 3 to 6 min | 5289 ± 1321 # | 295 ± 77 # | 128 ± 169 # | 5121 ± 1268 # | 9.0 ± 1.3 # |
| 6 to 9 min | 5450 ± 1180 # | 304 ± 77 # | 79 ± 135 # | 5225 ± 1123 # | 9.2 ± 1.0 # |
| Moderate | |||||
| 0 to 3 min | 2200 ± 906 | 140 ± 25 | 67 ± 94 | 2126 ± 939 | 6.4 ± 1.8 |
| 3 to 6 min | 2823 ± 1083 # | 169 ± 33 | 34 ± 58 | 2687 ± 1036 # | 8.1 ± 1.7 # |
| 6 to 9 min | 2910 ± 1067 # | 189 ± 40 | 0 ± 0 | 2731 ± 1035 # | 8.3 ± 1.8 # |
Values are means ±SD. Values are reported over 3-min time segments. VO2: directly measured VO2; VO2VM: VO2 requested by ventilatory muscles; [La−] equivalent: oxygen equivalent of lactate; AdjO2Eq: energy cost of exercise expressed as a sum of aerobic and glycolytic sources (VO2 + [La−] equivalent) and subtracted by VO2VM. ANOVA revealed a significant “intensity” × “time” interaction for VO2 (p ≤ 0.001), VO2VM (p ≤ 0.001), [La−] equivalent (p ≤ 0.001), and AdjO2Eq (p ≤ 0.001). Multiple comparisons are displayed in the table: # represents significant statistical difference with 0 to 3 min segment; * represents significant statistical difference with 3 to 6 min segment. Please note that values measured during warm-up were subtracted. For greater clarity comparisons between intensity domains were omitted (always significantly different, with the exceptions of (i) [La−] equivalent between “heavy” and “moderate” during the 3–6 and 6–9 time segments and (ii) VO2gain between “severe” and “heavy” in the 0–3 segment (iii) VO2gain between “severe” and “heavy” and “heavy” and “moderate” in the 3–6 segment)