The 10/7 HIIT Shock Cycle Study: Effectiveness of 10 HIIT Sessions in 7 Days

NCT ID: NCT05067426

Last Updated: 2024-01-31

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 33 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2021-08-15
• Study Completion Date: 2022-12-31

Brief Summary

A randomized, controlled trial to evaluate the effects of two versions of 10 high intensity interval trainings (HIIT) within a 7-day shock microcycle on endurance performance, well-being, health, stress and recovery in trained athletes.

Detailed Description

Thirty-six trained endurance athletes will be recruited and randomly assigned to either a "high volume (HIIT-HV)" group, a "low volume (HIIT-LV)" group, or a control group. All participants will be monitored before (9 days), during (7 days), and after (14 days) a 7-day training intervention, for 30 days. Participants in both intervention groups will complete 10 HIIT sessions within the period of 7 days, with an additional 30 minutes of low-intensity training exclusively in HIIT-HV. HIIT sessions consist of aerobic HIIT, i.e., 5x4min at 90-95% of maximal heart rate interspersed by 2.5 min active recovery periods. To determine the effects of the intervention, performance diagnostics, and a 5 kilometer time trial will be conducted before and after the intervention. In addition, participants are closely monitored for general health, stress, fatigue, recovery, neuromuscular performance, executive functions and sleep.

Conditions

Healthy; Athlete; Performance

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

HIIT-HV

HIIT-HV - high intensity interval training high volume

Participants complete a total of 10 HIIT sessions over a 7-day period consisting of 5 x 4-minute intervals at an intensity of 90-95% of their individual maximum heart rate (HRmax), interspersed with a 2.5-minute active recovery period. Each training session is followed by 30 minutes of low-intensity training (total of 300 minutes of additional low-intensity training during this period).

Group Type: EXPERIMENTAL

Exercise

Intervention Type: OTHER

high-intensity interval training sessions

HIIT-LV

HIIT- LV - high intensity interval training low volume

Participants complete a total of 10 HIIT sessions over a 7-day period consisting of 5 x 4-minute intervals at an intensity of 90-95% of their individual maximum heart rate (HRmax), interspersed with a 2.5-minute active recovery period.

Group Type: EXPERIMENTAL

Exercise

Intervention Type: OTHER

high-intensity interval training sessions

Control group

Participants continue with their regular training program.

Group Type: NO_INTERVENTION

No interventions assigned to this group

Interventions

Exercise

high-intensity interval training sessions

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Female or male
• aged 18-45 years
• Proof of physical fitness (e.g. sports medical examination required) for measurements with higher intensities (e.g. endurance tests, competition simulation)
• Competition experience at the national or international level in an endurance sport
• VO2max ≥50ml/kg/min for females; ≥55 ml/kg/min for males or a 5-kilometer (km) time trial performance of ≤ 20:00 min (female), or ≤ 18:30 min (male)

Exclusion Criteria

• Systemic disease or other known pathology in the organs: heart, lungs, kidney, stomach, spleen, liver, gall bladder, and intestines.
• Evidence of pulmonary disease: forced expiratory volume in one second/forced expiratory volume < 70% with/without symptoms (cough, sputum) or other evidence of pulmonologic disease.
• Diabetes II.
• Neurological or psychological disease of any kind.
• Currently undergoing medical or psycho-therapeutic treatment.
• Health condition that does not allow regular participation in the training forms (e.g. acute illnesses such as fever or other flu-like infections within the last 7 days before the start of the study), orthopedic diseases, injuries to the muscular, bone, joint or tendon apparatus within the last three months.
• Alcohol or drug abuse.
• Already high training volume with high intensity training (more than 2 weekly training sessions of high-intensity training)

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 45 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Paracelsus Medical University

OTHER

Sponsor Role: collaborator

Johannes Gutenberg University Mainz

OTHER

Sponsor Role: collaborator

University of Salzburg

OTHER

Sponsor Role: lead

Responsible Party

Nils Haller, PhD

Senior Researcher

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Thomas Stoeggl, Professor, PhD

Role: STUDY_CHAIR

University of Salzburg

Locations

University of Salzburg

Salzburg, , Austria

Countries

Austria

References

Strepp T, Blumkaitis JC, Sareban M, Stoggl TL, Haller N. Training Intensity Distribution of a 7-Day HIIT Shock Microcycle: Is Time in the "Red Zone" Crucial for Maximizing Endurance Performance? A Randomized Controlled Trial. Sports Med Open. 2024 Sep 5;10(1):97. doi: 10.1186/s40798-024-00761-1.

Reference Type: DERIVED

PMID: 39235639 (View on PubMed)

Strepp T, Blumkaitis JC, Haller N, Stoggl TL. Adding LIT to HIIT: Is Low-Intensity Training Vital for Endurance-Trained Athletes during a 7-day HIIT Shock Microcycle? Med Sci Sports Exerc. 2024 Aug 1;56(8):1408-1421. doi: 10.1249/MSS.0000000000003435. Epub 2024 Apr 6.

Reference Type: DERIVED

PMID: 38587921 (View on PubMed)

Stoggl TL, Blumkaitis JC, Strepp T, Sareban M, Simon P, Neuberger EWI, Finkenzeller T, Nunes N, Aglas L, Haller N. The Salzburg 10/7 HIIT shock cycle study: the effects of a 7-day high-intensity interval training shock microcycle with or without additional low-intensity training on endurance performance, well-being, stress and recovery in endurance trained athletes-study protocol of a randomized controlled trial. BMC Sports Sci Med Rehabil. 2022 May 7;14(1):84. doi: 10.1186/s13102-022-00456-8.

Reference Type: DERIVED

PMID: 35526065 (View on PubMed)

Other Identifiers

NHaller

Identifier Type: -

Identifier Source: org_study_id