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Adaptations to training at the individual anaerobic threshold
S P Keith1, I Jacobs, T M McLellan
1Environmental Physiology Section, Defence and Civil Institute of Environmental Medicine, North York, Ontario, Canada.
Summary
Training at the individual anaerobic threshold (Th(an)) and training around it yield similar physiological adaptations. Both methods significantly improve maximal oxygen consumption and exercise performance compared to a control group.
Area of Science:
- Exercise Physiology
- Sports Science
- Metabolic Adaptations
Background:
- The individual anaerobic threshold (Th(an)) represents the highest metabolic rate for steady-state blood lactate during exercise.
- Understanding optimal training intensities is crucial for maximizing physiological adaptations.
Purpose of the Study:
- To compare the training adaptations resulting from continuous training at the Th(an) versus interval training around the Th(an).
Main Methods:
- Three groups (control, continuous at Th(an) [SS], interval around Th(an) [NSS]) trained for 8 weeks.
- Evaluated maximal oxygen consumption (VO2max), power output at Th(an), and muscle enzyme activities before and after training.
Main Results:
- Both SS and NSS groups showed significant improvements in VO2max and power output at Th(an).
- Adaptations in VO2max, power output at Th(an), and exercise time to exhaustion were comparable between SS and NSS groups.
- Muscle enzyme activities (citrate synthase, 3-hydroxyacyl-CoA-dehydrogenase) increased similarly in both trained groups.
Conclusions:
- Continuous training at the Th(an) and interval training around the Th(an) elicit similar training-induced adaptations.
- Both training strategies are effective in improving key physiological markers of fitness.