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Maximal-intensity intermittent exercise: effect of recovery duration
P D Balsom1, J Y Seger, B Sjödin
1Karolinska Institute, Dept. of Physiology III, Stockholm, Sweden.
International Journal of Sports Medicine
|October 1, 1992
Summary
Shorter rest periods (30 seconds) between 40m sprints significantly impair acceleration and speed, despite similar blood lactate levels after 6 sprints. Blood lactate is a poor predictor of performance in repeated sprint exercise.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- Repeated sprint ability is crucial in many sports.
- Understanding the impact of varying recovery durations on sprint performance and physiological responses is essential for training optimization.
Purpose of the Study:
- To investigate the effects of different recovery intervals (30s, 60s, 120s) on 40m sprint performance and physiological markers in male athletes.
- To assess the relationship between blood lactate accumulation and sprint performance during repeated sprint protocols.
Main Methods:
- Seven male subjects completed 15 x 40m sprints under three recovery conditions: 120s (R120), 60s (R60), and 30s (R30).
- Sprint times were measured using photocells, and blood lactate, plasma hypoxanthine, and uric acid concentrations were analyzed post-exercise.
- Oxygen uptake was measured during recovery periods.
Main Results:
- Sprint speed decreased significantly in the final 10m of each protocol, with earlier decrements observed at shorter recovery times (3 sprints in R30 vs. 11 in R120).
- Initial acceleration (0-15m) was impaired only in the R30 protocol.
- Post-exercise blood lactate was higher in R30, but showed no significant difference after 6 sprints, despite performance decrements, indicating its limited predictive value.
- Oxygen uptake during recovery increased with shorter rest periods, reaching 66% of maximum oxygen uptake in R30.
- Plasma hypoxanthine and uric acid levels increased post-exercise, indicating adenine nucleotide degradation.
Conclusions:
- Reduced recovery durations (especially 30s) negatively impact repeated sprint performance, particularly acceleration and sustained speed.
- Blood lactate concentration is an unreliable indicator of performance during repeated sprint exercise with short recovery intervals.
- Physiological responses, including oxygen uptake and markers of anaerobic metabolism, are influenced by recovery duration during intense intermittent exercise.