AUTHOR=Savolainen Eero H. J. , Ihalainen Johanna K. , Vänttinen Tomi , Walker Simon 

TITLE=Changes in female football players’ in-season training load, intensity and physical performance: training progression matters more than accumulated load

JOURNAL=Frontiers in Sports and Active Living

VOLUME=6

YEAR=2024

URL=https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2024.1454519

DOI=10.3389/fspor.2024.1454519

ISSN=2624-9367

ABSTRACT=<sec><title>Introduction</title><p>This observational study investigated: (1) potential changes in female football players’ in-season training load, intensity and physical performance, and (2) if in-season accumulated training load, intensity, or their progression are associated to changes in physical performance.</p></sec><sec><title>Methods</title><p>Thirty-five national level female players (∼21 years, <italic>n</italic> = 35) from three top-teams of the Finnish national league participated. Players performed tests at the beginning and at the end of the 27-week in-season. Tests were: 30-m sprint, countermovement jump (CMJ) and 1,200-m shuttle run, used to calculate maximal aerobic speed (MAS). Players’ external and internal training load and intensity were monitored in all on-field training sessions and official matches (3,941 data samples) using Polar Team Pro system.</p></sec><sec><title>Results</title><p>Training load decreased towards the end of the in-season (<italic>p</italic> &lt; 0.05), but intensity remained stable. No changes in physical performance test results occurred from before to after in-season tests at a group level. Change of CMJ correlated negatively with accumulated training load, intensity and progression of total distance (TD) and low-intensity running distance (LIRD) (<italic>r</italic> = −0.398 to −0.599, <italic>p</italic> &lt; 0.05). Instead, development of MAS correlated positively with progression of TD and LIRD intensities (<italic>r</italic> = 0.594 and 0.503, <italic>p</italic> &lt; 0.05). Development of both CMJ and MAS correlated positively with intensity progression of very-high-intensity running distance (VHIRD) and number of accelerations and decelerations (<italic>r</italic> = 0.454–0.588, <italic>p</italic> &lt; 0.05).</p></sec><sec><title>Discussion</title><p>Reduced training load over the in-season is not detrimental for players’ physical performance when training intensity progressively increases. Intensity progression of VHIRD, moderate- and high-intensity accelerations and decelerations are indicators of both MAS and CMJ development, respectively.</p></sec>