Table 1.
Substrate oxidation during exercise in children, adolescents and adults with CHO or water intake.
| Age (years) |
CHO intake Ex. protocol |
Treatment | Time (min) |
RER 1 | Substrate Fat (%) |
Oxidation CHO(%) |
|
|---|---|---|---|---|---|---|---|
| Riddell, 2000a | 15 | 1.5 g·kg-1·h-1 91 g·h-1 |
water | 60 | 0.92 | 20-25 | 80-75 |
| 60 min at 60% peak VO2 | CHO | 60 | 0.94 | 18-23 | 82-77 | ||
| Riddell, 2000b | 15 | 1.4 g·kg-1·h-1 ~170 g·2h-1 |
control |
60 90 |
0.92 - 0.91 - 0.91 |
24-30 24-54 |
76-70 76-46 |
| 120 min at 60% peak VO2 | CHO | 60 90 |
0.95 - 0.94 - 0.93 |
15-23 15-20 |
85-77 85-80 |
||
| Riddell, 2001 | 12.5 | ~1.5 g·kg-1·h-1 67 ±15 g·h-1 approx av. for G & GF drinks |
control | 30-60 90 |
0.87 - 0.83 - 0.83 |
40-55 40-55 |
60-45 60-45 |
| 90 min at 55% peak VO2 |
CHO | 30-60 90 |
0.90 - 0.86 - 0.85 |
32-45 32-45 |
67-55 67-55 |
||
| Timmons, 2001 | 10 | ~1.4 g·kg-1·h-1 boys ~50 g·h-1 men ~119 g·h-1 60 min at 70% peak VO2 |
control boys control men CHO boys CHO men |
30-60 30-60 30-60 30-60 |
0.91 - 0.88 0.96 - 0.93 0.91 - 0.91 0.96 - 0.94 |
32-35 15-20 30-30 15-18 |
68-65 85-80 70-70 85-82 |
| Montfort, 2005 | 15-17 | 1.4 g·kg-1·h-1
65 ±7.2 g · h-1 |
control | 30-60 90 |
0.96 – 0.95 0.93 |
11-15 19 |
89-85 - 81 |
| ~ 102 g ·90 min | CHO | 30-60 90 |
0.96 – 0.96 0.94 |
10-10 17 |
90-90 - 83 |
||
| Riddell, 2003 | adults | 1 g·kg-1·h-1 ~ 78 g · h-1 ~ 117 g ·90 min |
control 2 adults |
60 90 |
0.95 - 0.92 - 0.91 |
22 | 72 |
| 90 min at 60% peak VO2 | CHO adults |
60 90 |
0.97 - 0.94 - 0.94 |
16 | 80 |
1 RER does not include resting values;
2 Substrate oxidation data (% fat and carbohydrate) represent the last 60 min of exercise.