“Seasonal changes and variability of physical match demands in a highly trained female soccer team”
Author: João Barreira et al
Journal: Biology of Sport (2025)
AI written summary
This study investigated how physical match demands vary across matches, seasons, positions, and individual players in a highly trained professional women’s soccer team competing in the Italian Serie A over two seasons (2021–22 and 2022–23). Using 344 full-match GPS observations from 27 players, the researchers quantified seasonal trends, sources of variability, and minimum detectable changes (MDC) for common GPS metrics.
Key Aims
- Describe match external loads across two seasons.
- Quantify how much match physical performance varies (between matches, players, positions, seasons, and within players).
- Establish thresholds for meaningful individual changes across matches.
Main Findings
1. Overall Match Demands
Typical match values (averaged across both seasons):
- Total Distance: ~9,290 m
- m/min: ~103
- High-Speed Running (HSRD): ~289–309 m
- High Metabolic Load Distance (HMLD): ~1,982 m
- Max Speed: ~26.3 km/h
- Acceleration & Deceleration Distances: Highly variable
These values align with elite-level women’s football benchmarks (e.g., FIFA Women’s World Cup)
2. Between-Season Difference
Only HSRD increased significantly in Season 2 (+36.9 m; large effect) — suggesting more distance performed at >19.8 km/h despite similar total distances. Other metrics showed no meaningful differences between seasons
3. Variability of Match Demands
The study decomposed variability into:
- Between-match
- Between-player
- Between-position
- Between-season
- Within-player
High-intensity metrics = most variable
- HSRD CV: 11.6%–33.7%
- Accelerations & Decelerations CV: 22%–30%
- HMLD CV: up to 12.2%
Lower-intensity metrics = very stable
- Total Distance CV: ~4–5%
- m/min CV: ~4–5%
- Max Speed: only 3–5% variability
This confirms that high-intensity outputs fluctuate heavily due to tactical and contextual match factors, while global running load is more stable. Coaches should avoid overinterpreting single-match HSRD changes
4. Minimum Detectable Changes (MDC)
Based on match-to-match variability and smallest worthwhile change, the study established thresholds for meaningful individual changes:
Stable (low-intensity) metrics → meaningful change ≈ ±12–15%
- Total Distance
- m/min
- Max Speed
Highly variable metrics → meaningful change extremely high
- HSRD: +83% to +104%
- Accelerations: +84% to +106%
- Decelerations: +65% to +82%
- HMLD: +32% to +40%
In practice, a normal week-to-week fluctuation in HSRD could be ±30–40%, so a “big drop” or “big spike” is not automatically meaningful
5. Seasonal Trends
Figures on page 5 show mostly flat seasonal trends across both seasons:
- No clear increase/decrease in most metrics over time.
- Exception: Season 2 showed increasing max speed and increasing deceleration distance across weeks (possibly linked to tactical evolution or player roster changes)
Practical Implications for Practitioners
1. Use stable metrics (TD, m/min, max speed) to monitor changes.
These metrics are reliable indicators of within-player deviation across matches.
2. Be cautious with high-intensity data.
HSRD and acceleration/deceleration distances are too variable to interpret without context (scoreline, opposition, playing style, player role, fatigue) BS_Art_57114-10.
3. Contextual factors must be integrated.
Opposition level, team tactics, match status, and ball possession heavily influence high-intensity actions.
4. Training prescription should remain varied.
Because match demands fluctuate widely, simply targeting match loads (e.g., replicating 600 m HSRD) is insufficient.
Conclusion
Seasonal changes in physical performance in this professional women’s football team were minimal. Low-intensity metrics were stable, while high-intensity metrics showed very high variability, requiring large changes before they become meaningful. Coaches and performance staff should interpret high-intensity outputs cautiously and rely on broader context when making training or recovery decisions.
