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

NCT05067426 | Completed

• 1 other identifier: NHaller
• Study Type: interventional
• Target: 33
• Locations: 1 country
• Sites: 1

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.

Conditions

Healthy; Athlete; Performance

Keywords

High-intensity interval training; Microcycle; Endurance training; Load monitoring; Athlete performance; HIT training; Block training; HIT block; Polarized training

Outcome Measures

Primary Outcomes (6)

• Endurance performance I

  Change of maximal oxygen uptake (VO2max in ml/min/kg) compared to baseline and group

  10 to 21 days (assessment is conducted once before the intervention and repeated three times afterwards, i.e. 3, 7 and 14 days after the completion of the intervention)

• Endurance performance II

  Change of peak performance (Ppeak in Watt) compared to baseline and group

  10 to 21 days (assessment is conducted once before the intervention and repeated three times afterwards, i.e. 3, 7 and 14 days after the completion of the intervention)

• Endurance performance III

  Change of 5 kilometer time trial performance (in sec) compared to baseline and group

  20 to 22 days (the assessment is conducted once before, and once after the intervention)

• Endurance performance IV

  Change of lactate threshold (in km/h) compared to baseline and group

  10 to 21 days (assessment is conducted once before the intervention and repeated three times afterwards, i.e. 3, 7 and 14 days after the completion of the intervention)

• Endurance performance V

  Change of ventilatory thresholds (in km/h) compared to baseline and group

  10 to 21 days (assessment is conducted once before the intervention and repeated three times afterwards, i.e. 3, 7 and 14 days after the completion of the intervention)

• Endurance performance VI

  Change of running economy (in ml/min/kg) compared to baseline and group

  10 to 21 days (assessment is conducted once before the intervention and repeated three times afterwards, i.e. 3, 7 and 14 days after the completion of the intervention)

Secondary Outcomes (27)

• Change of questionnaire scores - well-being

  30 days (questionnaires will be given to participants several times before, during, and after the intervention.)

• Change of questionnaire scores - muscular fatigue

  30 days (questionnaires will be given to participants several times before, during, and after the intervention.)

• Change of questionnaire scores - vitality

  30 days (questionnaires will be given to participants several times before, during, and after the intervention.)

• Change of questionnaire scores - rate of fatigue

  30 days (questionnaires will be given to participants several times before, during, and after the intervention.)

• Change of questionnaire scores - sleep quality

  30 days (questionnaires will be given to participants several times before, during, and after the intervention.)

Study Arms (3)

HIIT-HV

EXPERIMENTAL

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).

Other: Exercise

HIIT-LV

EXPERIMENTAL

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.

Other: Exercise

Control group

NO INTERVENTION

Participants continue with their regular training program.

Interventions

Exercise OTHER

high-intensity interval training sessions

HIIT-HV; HIIT-LV

Eligibility Criteria

• Age: 18 Years - 45 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• 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)

You may not qualify if:

• 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)

Sponsors & Collaborators

• University of Salzburg: lead
• Paracelsus Medical University: collaborator
• Johannes Gutenberg University Mainz: collaborator

Study Sites (1)

University of Salzburg

Salzburg, 5400, Austria

Location

Related Publications (4)

• Tomaskovic A, Strepp T, Stoggl TL, Neuberger EWI, Simon P, Haller N. Acute and Chronic Effects of a High-Intensity Interval Training Shock Microcycle on Cell-Free DNA: A Randomized Controlled Trial. Sports Med Open. 2025 Nov 21;11(1):132. doi: 10.1186/s40798-025-00923-9.

  PMID: 41269434 DERIVED

• 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.

  PMID: 39235639 DERIVED

• 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.

  PMID: 38587921 DERIVED

• 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.

  PMID: 35526065 DERIVED

MeSH Terms

Interventions

Exercise

Intervention Hierarchy (Ancestors)

Motor Activity; Movement; Musculoskeletal Physiological Phenomena; Musculoskeletal and Neural Physiological Phenomena

Study Officials

• Thomas Stoeggl, Professor, PhD

  University of Salzburg

  STUDY CHAIR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Senior Researcher

Model Details: Participants are randomly assigned in either one of 2 intervention groups or a control group (ratio 1:1:1).

Study Record Dates

• First Submitted: September 6, 2021
• First Posted: October 5, 2021
• Study Start: August 15, 2021
• Primary Completion: December 31, 2022
• Study Completion: December 31, 2022
• Last Updated: January 31, 2024

Record last verified: 2024-01

Data Sharing

• IPD Sharing: Will not share

Locations

AU (1)