An interventional study of 30-15 Intermittent Fitness Test and Control in Change in Maximal Oxygen Uptake (VO₂Max), sponsored by Gümüşhane Universıty. Completed at 1 site in Turkey (Türkiye). Open to female participants aged 18 Years to 30 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-02-06.
Sponsored by Gümüşhane Universıty · Not applicable, Interventional, and Supportive care
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.
Gümüşhane Universıty is the lead sponsor of 34 studies on the registry; 5 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
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.
Other: 30-15 Intermittent Fitness Test · Other: Control
Inspiratory Muscle Warm-Up Non-treated group, Control
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.
Inspiratory Muscle Warm-Up Non-treated group, Control
Maximal Running Speed (MRS)
Highest running speed achieved during each protocol.
Time frame: DAY 1
Maximal Oxygen Uptake (VO₂max)
Maximal oxygen uptake measured via breath-by-breath gas analysis.
Time frame: Day 1
body composition
Body composition (BMI)
Time frame: 1 Day
Maximal Heart Rate (HRmax)
Peak heart rate achieved during each test.
Time frame: 1 Day
Maximal Oxygen Uptake (VO₂max)
Maximal oxygen uptake measured via breath-by-breath gas analysis.
Time frame: DAY 1
Plan to share: Yes
Supporting information: Study protocol
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This study is completed, as verified in Feb 2026. You cannot join it, but the record below documents what was studied.
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Gümüşhane Universıty