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Long-term adaptations of high-intensity interval training

Long-Term Physiological Adaptations Induced by Short-Interval High-Intensity Exercises: an RCT comparing active and passive recovery in trained young adults

Status
Completed
Phases
Unknown
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12624001352594
Enrollment
18
Registered
2024-11-08
Start date
2023-09-04
Completion date
2023-10-10
Last updated
2024-11-18

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

The primary purpose is to understand whether gym combined with running exercises positively affected trained young adults. The secondary purpose is to understand if active and passive recovery during an 8-week follow-up may induce different adaptations in terms of body fat and fat-free mass, tissue water distribution, and physical performance. The last purpose is understanding if gender induces different effects. The main hypothesis is a general improvement induced by the prescribed protocol in both groups. Active recovery is expected to widely increase fat oxidation, while passive recovery favours muscle hypertrophy. Active recovery is supposed to bigger improve VO2peak, while passive recovery expects a greater level of strength. Females are supposed to widely reduce body fat and increase VO2peak, while males are supposed to improve power and agility.

Interventions

High-intensity interval training combining running and free-body exercises. The intervention includes an active recovery of nearly 60% of the participant's maximal heart rate, while passive recovery does not include exercise during rest time. The active recovery includes walking (or running) at a speed related to 60% HRmax, within an apposite gym space. The space dimension is adapted allowing participants to run at the prescribed speed (number of laps in the rest time). A trained kinesiologist

High-intensity interval training combining running and free-body exercises. The intervention includes an active recovery of nearly 60% of the participant's maximal heart rate, while passive recovery does not include exercise during rest time. The active recovery includes walking (or running) at a speed related to 60% HRmax, within an apposite gym space. The space dimension is adapted allowing participants to run at the prescribed speed (number of laps in the rest time). A trained kinesiologist supervises exercise. A group-based training of four participants is administered. Each session lasts about 50 minutes and the protocol includes two weekly sessions. The intervention lasts 8 weeks. Participants fill out an exercise diary during each session, in which the number of repetitions and the external load are reported. In addition, the heart rate is monitored by a Bluetooth device and the average and peak levels are reported. Finally, after 30 minutes at the end of each session, participants are instructed to report the perceived effort through a validated scale. Training exercises follow: session 1) shuttle run (4 meters), squat to press, mountain climber, renegade row, jumping split lunges, 8 sip low skips, push-up; session 2) dumbell woodchopper, high knees skips, kettlebell swing, agility drills, side shuttle (3 meters), squat jump, plank leg raises, burpees.

Sponsors

University of Bologna
Lead SponsorUniversity

Study design

Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Educational / counselling / training
Masking
Blinded (masking used) (Subject, Caregiver)

Eligibility

Sex/Gender
All
Age
18 Years to 32 Years
Healthy volunteers
Yes

Inclusion criteria

Healthy people with no diseases that could affect physical performance; at least five years of sports experience; Medical certification for participation in high-intensity exercise; 7 days of was-out before the first evaluation

Exclusion criteria

Participation in other exercises or sports; lacks more than one protocol training; onset of any injection or condition that could affect physical performance

Outcome results

None listed

Source: ANZCTR · Data processed: Feb 4, 2026