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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.
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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| 30-15 Intermittent Fitness Test (30-15IFT) | Experimental | 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 | No Intervention | Inspiratory Muscle Warm-Up Non-treated group, Control |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| 30-15 Intermittent Fitness Test | 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. |
| Measure | Description | Time Frame |
|---|---|---|
| Maximal Running Speed (MRS) | Highest running speed achieved during each protocol. | DAY 1 |
| Maximal Oxygen Uptake (VO₂max) | Maximal oxygen uptake measured via breath-by-breath gas analysis. | Day 1 |
| Measure | Description | Time Frame |
|---|---|---|
| body composition | Body composition (BMI) | 1 Day |
| Maximal Heart Rate (HRmax) | Peak heart rate achieved during each test. | 1 Day |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| coşkun yılmaz, associate professor | Gümüşhane Universıty | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Gumushane Univetsity | Gümüşhane | Kelkit | 29600 | Turkey (Türkiye) |
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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.
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| Control | Other | Inspiratory Muscle Warm-Up Non-treated group, Control |
|
| Maximal Oxygen Uptake (VO₂max) | Maximal oxygen uptake measured via breath-by-breath gas analysis. | DAY 1 |