The effect of constant-intensity endurance training and high-intensity interval training on aerobic and anaerobic parameters in youth.
INTRODUCTION
High-Intensity Interval Training (HIIT) and Constant-Intensity Endurance Training (CIET) improves peak oxygen uptake (V̇O2) similarly in adults; but in children this remains unclear, as does the influence of maturity.


METHODS
Thirty-seven boys formed three groups: HIIT (football; n = 14; 14.3 ± 3.1 years), CIET (distance runners; n = 12; 13.1 ± 2.5 years) and a control (CON) group (n = 11; 13.7 ± 3.2 years). Peak V̇O2 and gas exchange threshold (GET) were determined from a ramp test and anaerobic performance using a 30 m sprint pre-and-post a three-month training cycle.


RESULTS
The HIIT groups peak V̇O2 was significantly higher than the CON group pre (peak V̇O2: 2.54 ± 0.63 l·min-1 vs 2.03 ± 0.53 l·min-1, d = 0.88; GET: 1.41 ± 0.26 l·min-1 vs 1.13 ± 0.29 l·min-1, d = 1.02) and post-training (peak V̇O2: 2.63 ± 0.73 l·min-1 vs 2.08 ± 0.64 l·min-1, d = 0.80; GET: 1.32 ± 0.33 l·min-1 vs 1.15 ± 0.38 l·min-1, d = 0.48). All groups showed a similar magnitude of change during the training (p > 0.05).


CONCLUSION
HIIT was not superior to CIET for improving aerobic or anaerobic parameters in adolescents. Secondly, pre- and post-pubertal participants demonstrated similar trainability.
['Runacres|A|A|https://orcid.org/0000-0002-8251-2805', 'Mackintosh|K A|KA|https://orcid.org/0000-0003-0355-6357', 'McNarry|M A|MA|https://orcid.org/0000-0003-0813-7477']
D000293:Adolescent D001827:Body Height D015992:Body Mass Index D001835:Body Weight D002648:Child D000076663:Endurance Training D000072696:High-Intensity Interval Training D006801:Humans D008297:Male D010101:Oxygen Consumption D011659:Pulmonary Gas Exchange D012420:Running D012741:Sexual Maturation D012916:Soccer
maturity adolescence Peak V̇O peak power pre-pubertal pubertal