External load of different length microcycles and relationships with match running performance in youth football - Michailidis, Y.; Kanaras, V.; Mandroukas, A.; Stafylidis, A.; Bamplekis, C.; Fousekis, A.; Vardakis, L.; Stamatelos, K.; Metaxas, I.; Kyranoudis, A. E.; Metaxas, T. I. (Research Quarterly for Exercise and Sport, 2025)