title: Relationship between indicators of training load in soccer players.
abstract: This study examined the relationship between work load indicators used to quantify full training sessions in soccer. The participants were 28 semiprofessional male soccer players age 22.9 ± 4.2 years, height 177 ± 5 cm, body mass 73.6 ± 4.4 kg. Players' physical and physiological work load was monitored over 44 training sessions using global positioning system devices (10 Hz) and heart rate, respectively. After each training session, players' training perceived-exertion (rating of perceived exertion [RPE]) was assessed using the Borg CR-10 scale. Players' internal training load was assessed using the session-RPE and the Edwards methods. Total distance, distances covered at arbitrary selected high-intensity speed zones (≥18 and 21 km·h(-1)), bout frequency at speed >18 and 21 km·h(-1), and work:rest ratio during training drills were considered as signs of physical work load. Furthermore, player load assumed as reflection of total center-of-mass acceleration was considered as representative of players' external load. Very-large association of player load with Edwards and session-RPE methods was found. Total distance covered was large to very large associated with Player Load, Session-RPE, and Edwards methods. The findings of this study provided evidence for the safe use of session-RPE, Edwards methods, and Players Load as valid indicators of training responses in soccer.
authors.affiliation: Faculty of Physical Activity and Sport Sciences, University of the Basque Country (EHU/UPV), Vitoria-Gasteiz, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Casamichana
authors.forename: Julen
authors.initials: J
authors.lastname: Castellano
authors.forename: Julio
authors.initials: J
authors.lastname: Calleja-Gonzalez
authors.forename: Jaime
authors.initials: J
authors.lastname: San Román
authors.forename: Carlo
authors.initials: C
authors.lastname: Castagna
mesh_terms: D000293:Adolescent; D000328:Adult; D015444:Exercise / Q000502:physiology* / Q000523:psychology*; D040362:Geographic Information Systems; D006339:Heart Rate; D006801:Humans; D008297:Male; D005082:Physical Exertion; D012420:Running / Q000502:physiology; D012916:Soccer / Q000502:physiology*; D055815:Young Adult