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High anaerobic energy release during submaximal arm exercise
M Jensen-Urstad1, I Hallbäck, K Sahlin
1Department of Clinical Physiology, Södersjukhuset, Stockholm, Sweden.
Clinical Physiology (Oxford, England)
|January 1, 1993
Summary
Anaerobic energy release is greater during submaximal arm exercise compared to leg exercise. This is shown by a higher oxygen deficit and blood lactate concentration during arm work, indicating more reliance on anaerobic processes.
Area of Science:
- Exercise Physiology
- Metabolic Responses
- Human Performance
Background:
- Estimating anaerobic energy release is crucial for understanding exercise metabolism.
- Oxygen deficit and blood lactate are key indicators of anaerobic contribution during exercise onset.
Purpose of the Study:
- To compare the anaerobic energy release during submaximal arm exercise (AE) and leg exercise (LE).
- To investigate the role of anaerobic metabolism at the onset of AE versus LE.
Main Methods:
- Eight male subjects performed 8-10 min of submaximal arm or leg cycling at the same relative workload.
- Oxygen uptake (VO2) and blood lactate were measured to calculate oxygen deficit.
- VO2 on-response kinetics and peak blood lactate were analyzed.
Main Results:
- The VO2 on-response half-time was significantly longer during AE (62s) than LE (33s).
- Peak blood lactate concentration was higher during AE (4.8 mmol/L) compared to LE (3.5 mmol/L).
- Oxygen deficit, relative to workload, VO2, or limb volume, was significantly higher during AE, indicating a greater anaerobic contribution.
Conclusions:
- Submaximal arm exercise elicits a greater reliance on anaerobic energy release compared to leg exercise.
- The body utilizes anaerobic pathways more extensively at the onset of arm work to meet energy demands.