| dc.description.abstract | Aim: The present study aims to compare the effects of high-intensive interval training (HIIT)
and all-out supramaximal intensity interval training (SIT) on maximal oxygen uptake
(VO2max), work economy (WE), lactate threshold (LT), anaerobic capacity (maximal
accumulated oxygen deficit (MAOD)), and 300- and 3000-meter running performance in
moderately endurance-trained females. Methods: 11 healthy, non-smoking, and recreationally
active to moderately endurance-trained females were randomized to perform HIIT or SIT
three times per week over 8 weeks. HIIT was performed as 4 x 4-minute treadmill running
intervals at 90-95 % of maximal heart rate (HRmax) interspersed with 3-minute active recovery
at 70 % of HRmax between intervals. SIT was performed as 10 x 30-second all-out treadmill
running intervals interspersed with 3.5-minute active recovery at 70 % of HRmax between
intervals. Results: The VO2max and oxygen (O2) pulse increased significantly more after HIIT
compared to SIT (p < 0.01 and p < 0.05, respectively). VO2max increased by 8.9 % after HIIT
(54.1 to 58.9 ml·kg-1·min-1) and by 3.3 % after SIT (54.1 to 55.8 ml·kg-1·min-1). The VO2max
improvements were closely followed by O2 pulse improvements of 9.3 % after HIIT and by
3.5 % after SIT. MAOD increased significantly more after SIT compared to HIIT. The SIT
group improved MAOD by 32 % (60.6 to 79.8 ml·kg-1), while the changes were not
significant after HIIT. The 300- and 3000-meter running performance changes were not
significantly different between groups. The 3000-meter running performance improved by 5.7
% after HIIT (843 to 794 seconds) and by 5.7 % after SIT (845 to 797 seconds). The 300-
meter running performance improved by 5.1 % after HIIT (57.5 to 54.6 seconds) and by 5.7
% after SIT (54.3 to 50.8 seconds). Conclusion: HIIT was significantly more effective in
improving VO2max and O2 pulse compared to SIT. SIT was significantly more effective in
improving MAOD compared to HIIT. There was no significant difference in WE, LT, 300-
and 3000-meter running performance changes between groups. | |
