Akademik Veri Yönetim Sistemi
PEERJ, cilt.1, ss.1-24, 2026 (SCI-Expanded, Scopus)
Purpose. High-intensity interval training (HIIT) is a well-established exercise method,
known for its effectiveness in improving various aspects of fitness. This study aimed
to assess the effect of five distinct HIIT protocols, including Small Sided Games Long
Interval (SSG(LI)), Long Interval (LI), Small Sided Games Short Interval (SSG(SI)),
Short Interval (SI), and Sprint Interval Training (SIT), on aerobic, agility, vertical jump
performance, sprinting abilities, and heart rate variability (HRV) in amateur soccer
players.
Methods. Forty participants were randomly assigned to one of five training groups,
and a four-week training intervention was conducted. The pre- and post-training
assessments included measurements of maximal oxygen uptake (VO2max), anaerobic
power, reactive agility, vertical jump height, sprint times, and HRV parameters.
Results. Results showed that all training groups demonstrated significant improvements
in VO2max. Reactive agility performance significantly improved in the SSG(LI),
SSG(SI), SI, and SIT groups, whereas no significant changes were observed in sprint
times or anaerobic power. Leg-specific vertical jump performance showed significant
improvements in the right and left legs. HRV parameters showed variable responses to
the training protocols. Significant main effects of Time were observed for LF (F D3:592,
pD0:016, p2 D0:310) and low frequency/high frequency (LF/HF) ratio (F D5:699,
p D 0:023, p2 D 0:151), indicating overall changes across participants from pre- to
post-training. Conclusions. These findings underscore the adaptability of HIIT and its association
with improvements in aerobic endurance, agility, and leg-specific vertical jumping
capabilities across different training forms, while acknowledging that causation cannot
be definitively established due to the quasi-experimental design.