The 30-15 Intermittent Fitness Test Provides Superior Sport-Specific Sensitivity to Treadmill Testing in Elite Female Footballers

NCT ID: NCT07193108

Last Updated: 2026-02-06

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

20 participants

Study Classification

INTERVENTIONAL

Study Start Date

2025-03-05

Study Completion Date

2025-05-20

Brief Summary

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This study compares the acute aerobic, metabolic, and threshold-related physiological responses elicited by the 30-15 Intermittent Fitness Test (30-15IFT) and a treadmill-based incremental running test in elite female football players. Using a randomized crossover design, all participants completed both testing protocols with a 48-hour recovery period. Outcomes included maximal oxygen uptake, maximal running speed, heart rate responses, lactate-derived thresholds, metabolic tolerance indices, and recovery markers.

Detailed Description

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Laboratory-based treadmill tests are commonly used to assess aerobic capacity in football players; however, they lack sport-specific characteristics such as intermittent running, accelerations, and changes of direction. The 30-15 Intermittent Fitness Test (30-15IFT) has been proposed as a more ecologically valid field-based alternative.

Twenty-seven elite female football players competing in the Turkish Women's Super League completed both the 30-15IFT and a standardized treadmill incremental protocol in a randomized crossover design. Tests were separated by 48 hours and performed under controlled environmental conditions. Physiological variables including VO₂max, maximal running speed, maximal heart rate, respiratory exchange ratio, lactate-derived thresholds (OBLA), metabolic load-dependent tolerance, and post-exercise recovery markers were assessed using breath-by-breath gas analysis, heart rate monitoring, and capillary blood lactate sampling.

The study aims to determine whether the 30-15IFT elicits more sensitive and sport-specific physiological responses compared with treadmill testing, thereby supporting its use in performance monitoring and individualized training prescription in elite women's football.

Conditions

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Change in Maximal Oxygen Uptake (VO₂Max)

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

PARALLEL

This study used a randomized crossover design in which all participants completed both the 30-15 Intermittent Fitness Test and a treadmill-based incremental running test. The order of the test protocols was randomized, and a 48-hour recovery period was implemented between sessions to minimize carryover effects. Physiological responses were compared within participants across the two testing conditions.
Primary Study Purpose

SUPPORTIVE_CARE

Blinding Strategy

SINGLE

Participants

Study Groups

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30-15 Intermittent Fitness Test (30-15IFT)

Participants performed the 30-15 Intermittent Fitness Test consisting of 30-second running bouts interspersed with 15-second passive recovery periods, with progressive increases in running speed until volitional exhaustion.

Group Type EXPERIMENTAL

30-15 Intermittent Fitness Test

Intervention Type OTHER

Participants performed the 30-15 Intermittent Fitness Test consisting of 30-second running bouts interspersed with 15-second passive recovery periods, with progressive increases in running speed until volitional exhaustion.

Control

Intervention Type OTHER

Inspiratory Muscle Warm-Up Non-treated group, Control

CONTROL

Inspiratory Muscle Warm-Up Non-treated group, Control

Group Type NO_INTERVENTION

No interventions assigned to this group

Interventions

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30-15 Intermittent Fitness Test

Participants performed the 30-15 Intermittent Fitness Test consisting of 30-second running bouts interspersed with 15-second passive recovery periods, with progressive increases in running speed until volitional exhaustion.

Intervention Type OTHER

Control

Inspiratory Muscle Warm-Up Non-treated group, Control

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Female football players aged 18-35 years
* Competing in the Turkish Women's Super League
* Minimum of 3 years of professional football experience,
* Full participation in training and matches during the previous 6 months,
* Ability to perform maximal exercise testing

Exclusion Criteria

* Musculoskeletal injury affecting performance within the last 3 months,
* Diagnosed cardiovascular, metabolic, or respiratory disease,
* Any condition limiting maximal physical effort
Minimum Eligible Age

18 Years

Maximum Eligible Age

30 Years

Eligible Sex

FEMALE

Accepts Healthy Volunteers

Yes

Sponsors

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Gümüşhane Universıty

OTHER

Sponsor Role lead

Responsible Party

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Coşkun YILMAZ

ASSOC. PROF.

Responsibility Role PRINCIPAL_INVESTIGATOR

Principal Investigators

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coşkun yılmaz, associate professor

Role: PRINCIPAL_INVESTIGATOR

Gümüşhane Universıty

Locations

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Gumushane Univetsity

Gümüşhane, Kelkit, Turkey (Türkiye)

Site Status

Countries

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Turkey (Türkiye)

Other Identifiers

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2025-0451

Identifier Type: -

Identifier Source: org_study_id

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