HealthyTHESISNCT05067426
The 10/7 HIIT Shock Cycle Study: Effectiveness of 10 HIIT Sessions in 7 Days
A study testing Exercise in people with Healthy and Athlete, run by University of Salzburg at 1 site in Austria.
Trial 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. Read more about this study
- Who is it for?
- Ages 18 to 45 yearsHealthy volunteers can take part
- Conditions the study is for
- Healthy, Athlete, Performance
- What is being tested?
- Exercise
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 33 participants
- Where
- 1 siteAustria
- Study dates
- 15 Aug 2021to 31 Dec 2022
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 45 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- 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)
Who cannot join
- 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)
Trial locations and contacts
1 site in 1 country.
About this study
Official title: The 10/7 HIIT Shock Cycle Study: The Effects of a 7-Day High-Intensity-Interval Training Shock Microcycle on Endurance Performance, Well-Being, Stress and Recovery in Endurance Trained Athletes - Randomized Controlled Trial
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.
Read the 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
- Being tested
- Exercise
- Keywords
- High-intensity interval training, Microcycle, Endurance training, Load monitoring, Athlete performance, HIT training, Block training, HIT block, Polarized training
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
ExerciseOther
high-intensity interval training sessions
| Study group | Role | What they receive |
|---|---|---|
| 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). Receives: 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. Receives: Other: Exercise |
| Control group | No intervention | Participants continue with their regular training program. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Endurance performance I
Change of maximal oxygen uptake (VO2max in ml/min/kg) compared to baseline and group
Measured: 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
Measured: 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
Measured: 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
Measured: 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
Measured: 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
Measured: 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
Change of questionnaire scores compared to baseline and group as determined by a Visual-Analogue-Scale (from 0-100 millimeters). Higher scores indicate poorer well-being.
Measured: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - muscular fatigue
Change of questionnaire scores compared to baseline and group as determined by a Visual-Analogue-Scale (from 0-100 millimeters). Higher scores indicate higher degree of fatigue.
Measured: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - vitality
Change of questionnaire scores compared to baseline and group as determined by a Likert-Scale (from 0-10). Higher scores indicate higher vitality.
Measured: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - rate of fatigue
Change of questionnaire scores compared to baseline and group as determined by a Likert-Scale (from 0-10). Higher scores indicate higher degree of fatigue.
Measured: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - sleep quality
Change of questionnaire scores compared to baseline and group as determined by a Likert-Scale (from 1-7). Higher scores indicate poorer sleep.
Measured: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of blood count
Change of blood count concentrations compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of cell-free DNA
Change of cell-free DNA concentrations compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of creatine kinase
Change of creatine kinase concentrations compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of urea
Change of urea concentrations compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of blood lactate
Change of blood lactate concentrations compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of cytokines
Change of cytokine concentrations compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of miRNA
Change of miRNA compared to baseline and group
Measured: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of neuromuscular performance
Change of neuromuscular performance (counter movement jump height in cm) measured on a contact plate (AMTI, Watertown, USA) compared to baseline and group
Measured: 30 days (neuromuscular performance is assessed several times before, during, and after the intervention)
Change of body weight
Change of body weight in kg compared to baseline and group
Measured: 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)
Change of fat free mass
Change of fat free mass in kg compared to baseline and group
Measured: 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)
Change of fat mass
Change of fat mass in kg compared to baseline and group
Measured: 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)
Change of forced expiratory volume
Change of forced expiratory volume in liters compared to baseline and group
Measured: 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)
Change of power output during exercise
Change of power output in Watt (as determined via Stryd, Boulder, USA) during the intervention compared to baseline and group
Measured: 7 days
Change of sleep quality I - GPS watch
Change of sleep quality compared to baseline and group as determined by a GPS (Global Positioning System) watch
Measured: 30 days (sleep is assessed several times before, during, and after the intervention)
Change of sleep quality II - ABIOS App
Change of sleep quality compared to baseline and group as determined by the ABIOS (Algorithmik Biodata System) application
Measured: 30 days (sleep is assessed several times before, during, and after the intervention)
Correlations between sleep quality devices
To determine the correlations between different sleep monitoring devices, i.e. the GPS watch (see outcome 27), the ABIOS system (see outcome 28) and the sleep quality questionnaire (see outcome 11)
Measured: 30 days
Change of parameters recorded by an electrocardiogram - mean heart rate
Change of mean heart rate compared to baseline and group
Measured: 30 days (an electrocardiogram is written several times before, during, and after the intervention)
Change of parameters recorded by an electrocardiogram - heart rate variability
Change of heart rate variability (root mean sum of squared distance in ms) compared to baseline and group
Measured: 30 days (an electrocardiogram is written several times before, during, and after the intervention)
Change of executive functions - Eriksen flanker task
Change of executive functions compared to baseline and group. This is recorded through a modified Eriksen flanker task consisting of 108 images showing five white arrows on a black screen.
Measured: 30 days (executive functions are tested several times before, during, and after the intervention)
Change of executive functions - 2 back task
Change of executive functions compared to baseline and group. This is assessed through a 2-back task showing dots on a dice, numbers and geometrical figures.
Measured: 30 days (executive functions are tested several times before, during, and after the intervention)
Cardiac ultrasound
Description of an athlete cohort regarding cardiac chamber volume (in ml, determined via EPIQ CVX, X5-1, Philips Healthcare, Andover, MA, USA)
Measured: 1 day (this outcome will be determined once before study start)
Adherence to training program
Adherence to the HIIT training programs (determined as the ratio of training sessions performed to prescribed training sessions). This is determined by the researchers by checking the training data of the athletes. For example, if 9 out of 10 sessions were performed, this means 90% adherence.
Measured: 7 days
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted5 Oct 2021
- Study start15 Aug 2021
- Primary completion31 Dec 2022
- Study completion31 Dec 2022
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (4)Papers the sponsor has linked to this study.
- Other trials for HealthyStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- Participants are randomly assigned in either one of 2 intervention groups or a control group (ratio 1:1:1).
- Masking
- None (open label)
- Enrolment
- 33 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Salzburg
- Sponsor type
- University, hospital or other
- Collaborators
- Paracelsus Medical University, Johannes Gutenberg University Mainz
- Responsible party
- Principal investigator, Nils Haller, PhD, University of Salzburg
- Investigators
- Thomas Stoeggl, Professor, PhD, Study chair, University of Salzburg
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05067426
- Sponsor's protocol ID
- NHaller
- Acronym
- THESIS
- Status last verified
- Jan 2024
- First submitted
- 6 Sep 2021
- Last updated
- 31 Jan 2024
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
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.
PubMed 41269434Strepp 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.
PubMed 39235639Strepp 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.
PubMed 38587921Stoggl 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.
PubMed 35526065
Study at a glance
From the registry record, last updated by the sponsor on 31 Jan 2024. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The 10/7 HIIT Shock Cycle Study: The Effects of a 7-Day High-Intensity-Interval Training Shock Microcycle on Endurance Performance, Well-Being, Stress and Recovery in Endurance Trained Athletes - Randomized Controlled Trial
- ClinicalTrials.gov ID
- NCT05067426
- Acronym / sponsor ID
- THESIS / NHaller
- Conditions
- Healthy, Athlete, Performance
- Keywords
- High-intensity interval training, Microcycle, Endurance training, Load monitoring, Athlete performance, HIT training, Block training, HIT block
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 33 participants (actual)
- Lead sponsor
- University of SalzburgUniversity, hospital or other
- Collaborators
- Paracelsus Medical University, Johannes Gutenberg University Mainz
- Study start
- 15 Aug 2021 (actual)
- Primary completion
- 31 Dec 2022 (actual)
- Study completion
- 31 Dec 2022 (actual)
- First posted
- 5 Oct 2021 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
- Model description
- Participants are randomly assigned in either one of 2 intervention groups or a control group (ratio 1:1:1).
| Arm | Type | Receives |
|---|---|---|
| HIIT-HV | Experimental | Other: ExerciseHIIT-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). |
| HIIT-LV | Experimental | Other: ExerciseHIIT- 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. |
| Control group | No intervention | –Participants continue with their regular training program. |
Who may qualify
- Ages
- 18 to 45 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (5 listed)
- 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)
Key exclusion criteria (8 listed)
- 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.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Exercisehigh-intensity interval training sessions | Other | HIIT-HV, HIIT-LV |
Primary outcome
Endurance performance I
Time frame: 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)
Change of maximal oxygen uptake (VO2max in ml/min/kg) compared to baseline and group
Endurance performance II
Time frame: 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)
Change of peak performance (Ppeak in Watt) compared to baseline and group
Endurance performance III
Time frame: 20 to 22 days (the assessment is conducted once before, and once after the intervention)
Change of 5 kilometer time trial performance (in sec) compared to baseline and group
Endurance performance IV
Time frame: 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)
Change of lactate threshold (in km/h) compared to baseline and group
Endurance performance V
Time frame: 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)
Change of ventilatory thresholds (in km/h) compared to baseline and group
Endurance performance VI
Time frame: 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)
Change of running economy (in ml/min/kg) compared to baseline and group
27 secondary outcomes
Change of questionnaire scores - well-being
Time frame: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - muscular fatigue
Time frame: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - vitality
Time frame: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - rate of fatigue
Time frame: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of questionnaire scores - sleep quality
Time frame: 30 days (questionnaires will be given to participants several times before, during, and after the intervention.)
Change of blood count
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of cell-free DNA
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of creatine kinase
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of urea
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of blood lactate
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of cytokines
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of miRNA
Time frame: 30 days (blood is drawn from participants several times before, during, and after the intervention.)
Change of neuromuscular performance
Time frame: 30 days (neuromuscular performance is assessed several times before, during, and after the intervention)
Change of body weight
Time frame: 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)
Change of fat free mass
Time frame: 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)
Change of fat mass
Time frame: 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)
Change of forced expiratory volume
Time frame: 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)
Change of power output during exercise
Time frame: 7 days
Change of sleep quality I - GPS watch
Time frame: 30 days (sleep is assessed several times before, during, and after the intervention)
Change of sleep quality II - ABIOS App
Time frame: 30 days (sleep is assessed several times before, during, and after the intervention)
Correlations between sleep quality devices
Time frame: 30 days
Change of parameters recorded by an electrocardiogram - mean heart rate
Time frame: 30 days (an electrocardiogram is written several times before, during, and after the intervention)
Change of parameters recorded by an electrocardiogram - heart rate variability
Time frame: 30 days (an electrocardiogram is written several times before, during, and after the intervention)
Change of executive functions - Eriksen flanker task
Time frame: 30 days (executive functions are tested several times before, during, and after the intervention)
Change of executive functions - 2 back task
Time frame: 30 days (executive functions are tested several times before, during, and after the intervention)
Cardiac ultrasound
Time frame: 1 day (this outcome will be determined once before study start)
Adherence to training program
Time frame: 7 days
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 31 Jan 2024.
- Derived from this study: PubMed 41269434Tomaskovic 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.
- Derived from this study: PubMed 39235639Strepp 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.
- Derived from this study: PubMed 38587921Strepp 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.
- Derived from this study: PubMed 35526065Stoggl 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.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Thomas Stoeggl, Professor, PhD study chair
University of Salzburg
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Exercise in people with Healthy and Athlete, run by University of Salzburg at 1 site in Austria.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 31 Jan 2024. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Austria. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Endurance performance I (time frame: 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)). The study lists 6 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05067426, which also lists 4 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 31 Jan 2024.