Dose-response relationship between interval training frequency and magnitude of improvement in lactate threshold.
The purpose of this study was to determine if interval training at 110-120% of peak power output one and two days/wk in addition to habitual training would elicit improvements in lactate threshold (LT) in a dose response manner. Twenty physically active individuals completed this study: age--21.1+/-1.3 yr, height--172.1+/-7.4 cm, body mass--68.4+/-9.1 kg, VO (2)max--45.3+/-5.2 mL/kg/min; and were randomly assigned into two separate 6 wk training groups--either 1 day/wk interval training or 2 days/wk interval training at 110-120% of peak workload (from an incremental exercise test) on a cycle ergometer. After 6 wk, LT (% VO (2)max) increased significantly ( P<0.05) in both 1 day/wk (4.3+/-3.2%) and 2 days/wk (8.2+/-2.6%) groups. A two-factor mixed ANOVA identified a significant interaction between exercise frequency and LT (%VO (2)max) values ( P<0.05) indicating that LT responded differently to 1 day/wk and 2 days/wk of interval training. Findings from the present study show high-intensity, interval training to be a successful strategy for modifying this important metabolic threshold. Moreover, results suggest that there is a dose-response relationship between frequency of interval training and the magnitude of LT improvement.
Minnesota State University, Mankato, Human Performance, Mankato, United States. lance.dalleck@mnsu.edu
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Dalleck
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Bushman
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Crain
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Gajda
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Koger
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Derksen
D000704:Analysis of Variance; D001642:Bicycling / Q000502:physiology; D016552:Ergometry; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption; D010806:Physical Education and Training / Q000379:methods*; D013997:Time Factors; D055815:Young Adult
D019344:Lactic Acid