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Substrate utilization during arm and leg exercise relative to the ventilatory threshold in men
N Yasuda1, B C Ruby, S E Gaskill
1Human Performance Laboratory, The University of Montana, Missoula, MT 59812-1825, USA.
The Journal of Sports Medicine and Physical Fitness
|October 23, 2002
Summary
Substrate utilization during arm exercise is similar to leg exercise at lower intensities. However, at higher intensities, arm exercise relies more on carbohydrate utilization than leg exercise.
Area of Science:
- Exercise Physiology
- Metabolic Adaptations
- Human Performance
Background:
- Substrate utilization varies between different exercise modalities.
- Understanding these differences is crucial for optimizing training and performance.
- Arm cranking (AC) and leg cycling (LC) engage distinct muscle groups with unique metabolic demands.
Purpose of the Study:
- To investigate variations in substrate utilization between arm and leg exercise.
- To compare metabolic responses at 70% and 90% of mode-specific ventilatory threshold (Tvent).
- To determine if exercise intensity influences substrate selection in different limbs.
Main Methods:
- Ten male subjects performed 15-minute bouts of AC and LC exercise.
- Exercise intensities were set at 70% and 90% of the ventilatory threshold (Tvent).
- Ventilatory methods were used to determine Tvent, and substrate utilization was calculated.
Main Results:
- Oxygen consumption (VO2), ventilation (VE), and heart rate (HR) were higher during LC exercise.
- At 70% Tvent, relative carbohydrate and fat oxidation were similar between AC and LC.
- At 90% Tvent, AC showed significantly higher relative carbohydrate oxidation compared to LC.
Conclusions:
- Substrate utilization is comparable between AC and LC exercise at 70% Tvent.
- Increased exercise intensity elevates carbohydrate dependence in the smaller arm musculature compared to the legs.
- These findings highlight intensity-dependent metabolic differences between upper and lower body exercise.
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