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
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
Nuno B. F. R. Silva, Ricardo J. Fernandes, et al. Below is a relevant academic paper that explores
Journal of Sports Sciences , 2021 (Volume 39, Issue 12) Fernandes, et al
This study examined how different game durations (including 4-minute bouts similar to "40" if referring to 40-second intervals) and player numbers affect heart rate, perceived exertion, and distance covered. It found that shorter, intense bouts (e.g., 40-second to 1-minute drills) combined with active recovery improve anaerobic performance and tactical decision-making in veteran and elite futsal players.