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

NCT07193108 | Completed DMC

• 1 other identifier: 2025-0451
• Study Type: interventional
• Target: 20
• Locations: 1 country
• Sites: 1

Brief Summary

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.

Conditions

Change in Maximal Oxygen Uptake (VO₂Max)

Keywords

aerobic capacity; intermittent fitness assessment; women's football; metabolic response

Outcome Measures

Primary Outcomes (2)

• 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

Secondary Outcomes (3)

• body composition

  1 Day

• Maximal Heart Rate (HRmax)

  1 Day

• Maximal Oxygen Uptake (VO₂max)

  DAY 1

Study Arms (2)

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.

Other: 30-15 Intermittent Fitness Test; Other: Control

CONTROL

NO INTERVENTION

Inspiratory Muscle Warm-Up Non-treated group, Control

Interventions

Control OTHER

Inspiratory Muscle Warm-Up Non-treated group, Control

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

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.

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

Eligibility Criteria

• Age: 18 Years - 30 Years
• Sex: female
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64)

You may qualify if:

• 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

You may not qualify if:

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

Sponsors & Collaborators

• Gümüşhane Universıty: lead

Study Sites (1)

Gumushane Univetsity

Gümüşhane, Kelkit, 29600, Turkey (Türkiye)

Location

Study Officials

• coşkun yılmaz, associate professor

  Gümüşhane Universıty

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: SINGLE
• Who Masked: PARTICIPANT
• Purpose: SUPPORTIVE CARE
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: ASSOC. PROF.

Model Details: 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.

Study Record Dates

• First Submitted: September 12, 2025
• First Posted: September 25, 2025
• Study Start: March 5, 2025
• Primary Completion: March 15, 2025
• Study Completion: May 20, 2025
• Last Updated: February 6, 2026

Record last verified: 2026-02

Data Sharing

• IPD Sharing: Will share
• Shared Documents: STUDY PROTOCOL

Locations

TU (1)