Short or Long High Intensity Training

NCT ID: NCT04075929

Last Updated: 2019-09-03

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 22 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2017-11-01
• Study Completion Date: 2017-12-20

Brief Summary

To compare the effects of short and long high intensity interval training (HIT) conducted with the same total accumulated duration on physiological- and performance parameters during a 4-week training period.

Detailed Description

Studies among elite athletes have documented the importance of large amounts of training volume in order to perform at a high level in endurance sports. It is also well documented that both low intensity training (LIT), moderate intensity training (MIT) and high intensity training (HIT) should be included in the overall training efforts. It is well documented that HIT has a positive effect on the aerobic endurance among both elite athletes and recreational athletes.

Despite the fact that there is general agreement that HIT is an important part of the overall training, it is unclear how this part of the training should be organized in order to optimize the training effects. The adaptions of endurance performance seem to depend on both the intensity and the accumulated duration of the HIT sessions. Therefore, the aim of this study was to compare the effects of SI and LI training, including equal accumulated HIT duration, during a 4-week intervention period, conducted as 4x8-min with 2-min recovery periods, 4x(12x40/20-sec) with 2-min recovery periods and 4x(8x40/20-sec) with 2-min recovery periods, in different physiological- and performance parameters among well-trained cyclists.

Conditions

Sports Performance; Cycling; Well-trained Athletes

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: OTHER
• Blinding Strategy: SINGLE

Study Groups

4x8 min

4x8-min intervals with 2-min recovery periods. The same accumulated duration of these three interval groups means that the total interval time is the same for each group: 4x8-min = 32 min

Group Type: OTHER

Training effects on aerobic output

Intervention Type: OTHER

The cyclists were allowed to perform ad libitum low intensity (LIT) in addition to high intensity (HIT) sessions that were determined to each group. The cyclists completed 12 supervised HIT sessions during the intervention period, three HIT sessions per week with at least 48 hours between each HIT-session. All HIT sessions were performed as supervised group training sessions. Each HIT session started with an individual 30 minutes' warm up at low intensity (55-70% HRmax) interspersed by freely chosen progressive sprints. For all groups the power output during the recovery periods was 50 % of the power output used during work intervals. The cyclists in all groups were instructed to perform each interval session at their maximal sustainable intensity. Each session ended with 15-20 minutes' cool down (55-70% HRmax). All HIT sessions were supervised and performed in groups on the University of Agder's (UiA) premises at Spicheren fitness center in Kristiansand.

4x(8x40/20s)

4x(12x40/20-sec) intervals with 2-min recovery periods The same accumulated duration of these three interval groups means that the total interval time is the same for each group:4x(12x40/20-sec) = 32 min if the 20-sec recovery is not included in the total time of HIT

Group Type: OTHER

Training effects on aerobic output

Intervention Type: OTHER

The cyclists were allowed to perform ad libitum low intensity (LIT) in addition to high intensity (HIT) sessions that were determined to each group. The cyclists completed 12 supervised HIT sessions during the intervention period, three HIT sessions per week with at least 48 hours between each HIT-session. All HIT sessions were performed as supervised group training sessions. Each HIT session started with an individual 30 minutes' warm up at low intensity (55-70% HRmax) interspersed by freely chosen progressive sprints. For all groups the power output during the recovery periods was 50 % of the power output used during work intervals. The cyclists in all groups were instructed to perform each interval session at their maximal sustainable intensity. Each session ended with 15-20 minutes' cool down (55-70% HRmax). All HIT sessions were supervised and performed in groups on the University of Agder's (UiA) premises at Spicheren fitness center in Kristiansand.

4x(12x40/20s)

4x(8x40/20-sec) intervals with 2-min recovery periods The same accumulated duration of these three interval groups means that the total interval time is the same for each group: 4x(8x40/20-sec) = 32 min if the 20-sec recovery is included in the total time of HIT

Group Type: OTHER

Training effects on aerobic output

Intervention Type: OTHER

The cyclists were allowed to perform ad libitum low intensity (LIT) in addition to high intensity (HIT) sessions that were determined to each group. The cyclists completed 12 supervised HIT sessions during the intervention period, three HIT sessions per week with at least 48 hours between each HIT-session. All HIT sessions were performed as supervised group training sessions. Each HIT session started with an individual 30 minutes' warm up at low intensity (55-70% HRmax) interspersed by freely chosen progressive sprints. For all groups the power output during the recovery periods was 50 % of the power output used during work intervals. The cyclists in all groups were instructed to perform each interval session at their maximal sustainable intensity. Each session ended with 15-20 minutes' cool down (55-70% HRmax). All HIT sessions were supervised and performed in groups on the University of Agder's (UiA) premises at Spicheren fitness center in Kristiansand.

Interventions

Training effects on aerobic output

The cyclists were allowed to perform ad libitum low intensity (LIT) in addition to high intensity (HIT) sessions that were determined to each group. The cyclists completed 12 supervised HIT sessions during the intervention period, three HIT sessions per week with at least 48 hours between each HIT-session. All HIT sessions were performed as supervised group training sessions. Each HIT session started with an individual 30 minutes' warm up at low intensity (55-70% HRmax) interspersed by freely chosen progressive sprints. For all groups the power output during the recovery periods was 50 % of the power output used during work intervals. The cyclists in all groups were instructed to perform each interval session at their maximal sustainable intensity. Each session ended with 15-20 minutes' cool down (55-70% HRmax). All HIT sessions were supervised and performed in groups on the University of Agder's (UiA) premises at Spicheren fitness center in Kristiansand.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• male < 40 years,
• peak oxygen uptake (VO2peak) > 55 ml.kg-1.min-1,
• training volume >3 sessions per week (within cycling)
• absence of disease and injuries.

Exclusion Criteria

• disease/injuries
• frequent absence of HIT sessions during the period.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 40 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: Yes

Sponsors

University of Agder

OTHER

Sponsor Role: lead

Responsible Party

Monica Klungland Torstveit

Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Monica K. Torstveit, Professor

Role: PRINCIPAL_INVESTIGATOR

Universitetet i Agder

Locations

University of Agder

Kristiansand, , Norway

Countries

Norway

Other Identifiers

Aerobic short og long interval

Identifier Type: -

Identifier Source: org_study_id