Alberto Fílter PhD

Published my thesis in full, I provide the different papers here (1/5)

🎙️ New Podcast Summary 🎙️ Curvilinear sprinting: How we can test and train this unique quality with @AlbertoFilter “We train footballers like Pac-Man but a lot of sprinting in football is not in straight lines, the game is parabolic” 🔗 sportsmith.co/articles/curvi…

⚽️6 weeks of Curvilinear sprint training improved 5 m & 20 m sprint, COD, and sprint mechanics (↑Pmax, ↑RFmax; p≤0.05) in youth soccer players, with similar gains for narrow and wide curves. Solleiro-Duran et al.:🔓🔗 DOI: doi.org/10.5114/biolsp…

Intensity vs Volume: What Actually Builds Endurance? Exercise science finally gives us a clear answer 👇 Here’s what a large science-backed meta-analysis found: 1. Training intensity drives mitochondrial growth Higher intensity training led to up to 3.9x greater increases in mitochondrial content compared to lower intensity work. 2. Sprint interval training punches above its weight Short, intense sessions produced stronger mitochondrial adaptations than longer endurance sessions. 3. Volume matters, but less than you think More sessions help, but gains plateau faster than with increases in intensity. 4. Capillarization improves with consistency Capillary growth increases over time, especially after 8 weeks, regardless of training style. 5. Untrained individuals adapt faster Beginners see larger improvements than well trained athletes due to higher trainability. 6. Benefits apply across ages and health status Young, old, healthy, and clinical populations all showed positive adaptations. If time is limited, intensity delivers the biggest return. Train smart, not just long.

En la misma revista científica @Vic_BelGa ha publicado también: ✅ Impacto del rol y tamaño del campo en juegos de posición 🔗doi.org/10.1177/174795… Y en @sportsbiomechj ✅ Validez de la app @MyJumpApp para cronometraje de sprints curvos 🔗 doi.org/10.1080/147631… Enhorabuena!

@spikesonly What capacity? What do you mean? 🤔IMO the best way to develop strength is through on-field exercises with added overload. The challenge is that we often lack enough training equipment to apply overload while respecting specificity

@AlbertoFilter I get that, but where is the element of capacity then?

Conversion from the weight room is more about capacity than specificity. Remember the Mach Paradox, that getting better VBT scores in the weight room might make you better at doing the exercise but not better at the sport. Eventually, a saturation point exists in training.

@spikesonly The specificity principle relates to transferring sport-specific movements (experienced athletes benefit most; beginners improve with any stimulus). The ball can act as an intensifying element for jumps, sprints, and movement strategies.

@AlbertoFilter Is specificity better than transfer? Does looking like soccer matter? If the gym has no soccer balls, is that a problem?

🚀 The biggest Android update ever for @myjumplab With popular validated sprint tests by 🐐(@PierreSamozino @jb_morin @chrisbramah @AlbertoFilter) 🔬 Horizontal F–V profile ✅ Sprint Mechanics Assessment Score (S-MAS) 🌀 Curved sprint Now available👇 play.google.com/store/apps/det…

More free info available 👉 jhk.termedia.pl/The-Relationsh… @AlbertoFilter @marcmparera @TomDosSantos91 @bernarequena @IrineuLoturco @reQgroup

@spikesonly Totally, we don’t need more data, but better data. That means better interpretation (the most difficult part)

The next revolution in GPS is not data fidelity or precision; it's the importance of the vendors being a data hub for something called BAN. If your vendor isn't prepared for such a leap, ironically decades old, it's going to be a burden, time and money wise to support athletes.

Most of the curvilinear sports tech is unfortunately low quality. Buyer beware .

We said it 6 years ago at FSI Lab - now more evidence: curvilinear sprinting is the one of main event in football 1️⃣ 85% of sprints 2️⃣ 52% of HSI sprint-related patterns (Gandarias, 2025) 3️⃣ Offside rule favors curved high-speed entries 4️⃣ COD without braking = energy-efficient

@chrisbramah Congratulation mate!

Now open access 👇🏻👇🏻

Image 1 📸 A player performing the drop vertical jump. It can be seen the support anchored to the goal, which was used to suspend the ball, externalising the footballer’s focus of attention during the jump🦿 Image 2📸 A player executing the COD for the frontal plane analysis through the CMAS🏃 Uncover which components may be effective in reducing injury incidence🔎👇 🔗 sciofmultispeed.com/acl-injuries-i…

FSI Talks #16 is now available! 🎉 In this episode, we explore the power of sport science in leading performance teams with João Ribeiro 📺 Watch the full episode on YouTube: youtu.be/ZKjzrqM1k9M?fe… 🎧 Listen now on Spotify: open.spotify.com/episode/2k5roI…

@MilanWBetz Top. Congrats!

Conclusion: Cold-water immersion should be avoided during post-exercise recovery to ensure proper nutrient delivery to muscle tissue to maximize post-exercise muscle conditioning. 6/6 Have a look at the full article for more details: journals.lww.com/acsm-msse/abst…

Our latest work is now online! As part of my PhD work, we investigated whether post-exercise cooling affects muscle microvascular perfusion and amino acid incorporation into muscle tissue. Thread below! 1/6 journals.lww.com/acsm-msse/abst…

A combo drill of both curved and linear sprinting during a recent Liverpool training session. Research indicates approx 85% of football sprints are curvilinear. And, separately, that 45% of goals scored are preceded by a linear sprint. Makes sense to train both.

👟 How does each type of exercise affect performance? 📉 What are the implications for physical preparation? 🔍 Find out here 👉fsi.training/en/differences…

Just like it’s said that you should accelerate as fast as you can brake, on a curve, sprint as fast as you’re able to control the centrifugal force.

Running straight is easy, but without controlling centrifugal force, a curve can throw you off track. That’s why curve training is key in our weekly workouts.

@Coachmdd Of course Dave! My hometown is Cádiz, and having this discussion in the charm of Cádiz would be amazing. Whenever you come in the next few years, it will be a pleasure. And by the way, here you’ll find the best tuna in the world!

@AlbertoFilter My son is just finishing 2 weeks in Cadiz. I regret not having joined him and taking a side trip in hopes of a discussion with you. Will probably be over in the next few years, maybe then.