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CompletedNCT03155152Updated Mar 18, 2020

Decremental Exercise: a New Training Approach?

An interventional study of DECT and HIIT in Exercise Performance of Fit Athletes, sponsored by Swiss Federal Institute of Technology. Completed at 1 site in Switzerland. Open to participants aged 18 Years to 40 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2020-03-18.

Sponsored by Swiss Federal Institute of Technology · Not applicable, Interventional, and Other

Phase
Not applicable
Study type
Interventional
Enrollment
55
Allocation
Randomized
Ages
18 Years to 40 Years
Sex
All
01

Study summary

Different types of high-intensity interval training (HIIT) sessions are used by athletes in order to improve their physical performance, but innovative approaches to training are lacking. Therefore, in Part A of this study the physiological response to a standard HIIT and a new decremental exercise training (DECT) will be compared in runners and cyclists. Next, in Part B the training effects of a 4-week block of the HIIT and DECT will be compared.

02

Conditions studied

  • Exercise Performance of Fit Athletes
03

In context

Lead sponsor

Swiss Federal Institute of Technology is the lead sponsor of 152 studies on the registry; 10 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 40 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Age: 18-40 years
  • Healthy, i.e. normal physical and mental status (not taking any medication on a regular basis for more than a month, except contraceptive medication)
  • Normal Body-Mass-Index (BMI): 18.5-24.9 kg·m-2
  • Well-trained athletes: V̇O2max > 55.1 ml·min-1·kg-1 for men and > 50.1 ml·min-1·kg-1 for women
  • Normal lung function
  • Non-smoking
  • Willing to adhere to the general study rules

Exclusion criteria

Exclusion Criteria:

  • Women who are pregnant or breast feeding
  • Intention to become pregnant during the course of the study
  • Known or suspected non-compliance, drug or alcohol abuse
  • Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc. of the participant
  • Previous enrolment into the same part (A or B) of the current study
  • Enrolment of the investigator, his/her family members, employees and other dependent persons
  • Acute or chronic illness
  • Intake of medications affecting performance or the respiratory, cardiovascular or neuromuscular system
  • Insufficient training history (\<3 yrs of participation in competitive cycling/running) or training volume (\<40 km running/week or 150 km cycling/week) in the previous 6 months
  • Recent (\<3 months) history of orthopaedic injury or participation in structured high-intensity training blocks
05

Study design

Phase
Not applicable
Primary purpose
Other
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
55 participants (actual)

Study arms

  • Experimental
    DECT Group

    The DECT session consists of four bouts of 4 min high-intensity "decremental" exercise with 3 min of active recovery between bouts. Load is progressively decreased throughout each exercise bout. The training period will last for a total of 4 weeks, with three weekly sessions of supervised training

    Other: DECT

  • Active comparator
    HIIT Group

    The HIIT session consists of four bouts of 4 min high-intensity "decremental" exercise with 3 min of active recovery between bouts. Load is kept constant throughout each exercise bout. The training period will last for a total of 4 weeks, with three weekly sessions of supervised training

    Other: HIIT

Interventions

  • OtherDECT

    The DECT program consists of a 4-week training intervention with three weekly sessions of high-intensity interval training, in which during each exercise bout the workload is imposed in a decremental fashion.

  • OtherHIIT

    The HIIT program consists of a 4-week training intervention with three weekly sessions of high-intensity interval training, in which during each exercise bout the workload is kept constant.

06

What researchers measure

Primary outcomes

  1. Change in exercise performance

    Time taken to cover a fixed distance, in minutes

    Time frame: measured before and after the 4-week training block, during a time-trial (40 km cycling or 10 km running)

Secondary outcomes

  1. Change in maximal oxygen uptake

    Measured in ml/kg/min

    Time frame: Measured during a maximal incremental exercise test before and after the 4-week training block

  2. Average oxygen uptake

    Average oxygen uptake measured during the four 4-min bouts of high-intensity exercise of a session of HIIT and DECT

    Time frame: The two training session are performed within one week

07

Study locations

1 site
  • Exercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich
    Zurich, ZH 8057, Switzerland
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Mar 18, 2020, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT03155152
Lead sponsor
Swiss Federal Institute of Technology
Responsible party
Sponsor
First posted
May 16, 2017
Start date
Jun 1, 2017
Primary completion
Dec 11, 2019
Completion
Dec 11, 2019
Last update
Mar 18, 2020

Study contacts

Christina M Spengler, Prof.
principal investigator · ETH Zurich

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is completed, as verified in Feb 2019. You cannot join it, but the record below documents what was studied.

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