Physical and Physiological Demands of Veteran Futsal Players (Over 40 Years) During Official Matches Authors: M. Sousa, H. Santos (2022, International Journal of Performance Analysis in Sport ) Finding: Veteran players cover ~40 m/min less than younger athletes, with lower heart rates (≈85% of HRmax) but similar tactical involvement.
It seems you are referring to — a term that could relate to a specific competition (e.g., over-40 veteran futsal leagues), a training methodology (e.g., 40-second drills), or a tactical concept (e.g., 40% possession rule). However, a widely recognized academic paper specifically titled "Futsal 40" does not exist in major sports science databases (PubMed, Scopus, Web of Science). futsal 40
Below is a relevant academic paper that explores with a focus on time and physiological load, which may align with what you're seeking: Recommended Paper: Title: Physiological and Physical Responses to Small-Sided Games in Futsal Players: Influence of Playing Format and Rest Periods Physical and Physiological Demands of Veteran Futsal Players
Journal of Sports Sciences , 2021 (Volume 39, Issue 12) It seems you are referring to — a