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Effect of high-intensity submaximal work, with or without rest, on subsequent VO2max
Daniel A Judelson1, Kenneth W Rundell, Kenneth C Beck
1Coaching and Sports Sciences Division, United States Olympic Committee, Lake Placid, NY, USA.
Medicine and Science in Sports and Exercise
|February 10, 2004
Summary
High-intensity exercise before maximal oxygen uptake tests can reduce performance in about half of skiers. Exercise-induced hypoxemia may play a role, but its impact is unclear.
Area of Science:
- Exercise Physiology
- Sports Science
Background:
- Maximal oxygen uptake (.VO2max) tests are crucial for assessing aerobic fitness.
- These tests are often preceded by high-intensity submaximal exercise (lactate profile).
- The impact of this preceding exercise on subsequent .VO2max, and the role of exercise-induced hypoxemia (EIH), remain unclear.
Purpose of the Study:
- To determine how high-intensity submaximal exercise, with or without rest, affects subsequent .VO2max.
- To investigate if exercise-induced hypoxemia (EIH) contributes to any observed reductions in .VO2max.
Main Methods:
- Ten trained male cross-country skiers performed three trials: maximal test (MAX), MAX after a lactate profile with rest (DC), and MAX after a lactate profile without rest (C).
- .VO2max, ventilation, and arterial oxygen saturation were measured.
- Diffusion capacity was assessed post-exercise.
Main Results:
- No significant differences in .VO2max were found between trials, but the difference between MAX and DC approached significance (P=0.059).
- Approximately 50% of participants (responders) showed a >7.5% decrease in .VO2max during the DC trial compared to MAX.
- Responders exhibited higher aerobic capacity during the MAX trial.
Conclusions:
- .VO2max can be significantly reduced in about half of cross-country skiers following a high-intensity submaximal exercise bout and a 20-minute rest period.
- The precise role of exercise-induced hypoxemia (EIH) in these reductions requires further investigation.