Plasma catecholamine and nephrine responses to brief intermittent maximal intensity exercise
Richard M Bracken1, Denise M Linnane, Stephen Brooks
1Research Centre for Sport and Exercise Science, School of Human Sciences, Swansea University, Singleton Park, Swansea SA2 8PP, UK. R.M.Bracken@swansea.ac.uk
Amino Acids
|February 26, 2008
Summary
Exercise increases catecholamine metabolism, particularly during intermittent high-intensity sprints. This study shows elevated normetanephrine and metanephrine levels, suggesting enhanced catechol-O-methyl transferase activity during intense exercise.
Area of Science:
- Exercise Physiology
- Biochemistry
- Sports Medicine
Background:
- Catecholamines (noradrenaline, adrenaline, dopamine) are crucial for metabolic and cardiovascular regulation during exercise.
- The precise changes in catecholamine metabolism during physical exertion remain incompletely understood.
Purpose of the Study:
- To investigate plasma catecholamine and metanephrine responses during a laboratory-based model of games-type exercise.
- To elucidate the impact of intermittent sprinting on catecholamine metabolism.
Main Methods:
- Twelve healthy males participated in a controlled laboratory study.
- Participants completed a resting trial and a high-intensity intermittent exercise trial (ten 6-second sprints with 30-second recovery).
- Venous blood samples were analyzed for catecholamines and metanephrines.
Main Results:
- Plasma noradrenaline and adrenaline levels increased after each sprint, while dopamine remained unchanged.
- Plasma normetanephrine and metanephrine levels significantly elevated from the fourth sprint onwards.
- Peak normetanephrine increased by 60% and metanephrine by 230% compared to resting values.
Conclusions:
- Intermittent sprinting significantly increases catecholamine metabolism, indicated by elevated normetanephrine and metanephrine.
- This suggests enhanced catechol-O-methyl transferase activity during high-intensity intermittent exercise.
- Findings may inform strategies for regulating exercise responses and maintaining tissue adrenoceptor sensitivity.
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