The activity profiles of highly trained young soccer players were examined in relation to age, playing position and physical capacity. Time-motion analyses (global positioning system) performed on 77 (U13–U18; fullbacks [FB], centre-backs [CB], midfielders [MD], wide [W], second strikers [2ndS] [S]) during 42 international club games. Total distance covered (TD) very high-intensity activities (VHIA; >16.1 km·h−1) computed 186 entire player-matches. Physical capacity was assessed via field...

The aims of the current study were to examine magnitude between-GPS-models differences in commonly reported running-based measures football, between-units variability, and assess effect software updates on these measures. Fifty identical-brand GPS units (15 SPI-proX 35 SPIproX2, 15 Hz, GPSports, Canberra, Australia) attached a custom-made plastic sled towed by player performing simulated match running activities. data collected during training sessions over 4 wk from professional football...

To compare the peak intensity of typical small-sided games (SSGs) with those official matches in terms running demands and mechanical work (MechW) over different rolling average durations playing positions.Data were collected 21 players (25 [5] y, 181 [7] cm, 77 kg) belonging to an elite French football team. SSG data 2 seasons during training sessions (249 files, 12 [4] per player) (n = 12). Players' locomotor activity was recorded using 5-Hz Global Positioning System. Total distance (m),...

This study examined the occurrence and nature of repeated-sprint sequences (RSS) in highly-trained young soccer players, as a function age, playing position time. Time-motion analyses using global positioning system (GPS) were performed on 99 (U13, U14, U15, U16, U17 U18) players during 42 international games. Sprint activities defined at least 1-s run intensities higher than 61% individual peak running velocity; RSS, minimum 2 consecutive sprints interspersed with maximum 60 s. During first...

The purpose of this study was to quantify match play intensity distribution in young soccer players relation age, playing position and physical fitness. Distance covered heart rate were measured (global positioning system) on 103, highly-trained (Under13 Under 18) during 42 international club games. Maximal sprinting speed (MSS), estimated maximal aerobic (MAS) (HRmax) assessed via field test measures. (HR) categorized into 5 zones relative MSS MAS HR(max), respectively. Intensity...

This study assessed the relationship between peak match speed (PMS) and maximal sprinting (MSS) in regard to age playing positions. MSS absolute PMS (PMSAbs) were collected from 180 male youth soccer players (U13-U17, 15.0 ± 1.2 y, 161.5 9.2 cm, 48.3 8.7 kg). The fastest 10-m split over a 40-m sprint was used determine MSS. PMSAbs recorded using global positioning system also expressed as percentage of (PMSRel). Sprint data compared groups Results showed that regardless positions, faster...

Participation in soccer match-play leads to acute and transient subjective, biochemical, metabolic physical disturbances players over subsequent hours days. Inadequate time for rest regeneration between matches can expose the risk of training competing whilst not entirely recovered. In professional soccer, contemporary competitive schedules require teams compete excess 60 course season with periods fixture congestion occurring, prompting much attention from researchers practitioners...

To examine the reliability of field-based running-specific measures neuromuscular function assessed using global positioning system (GPS)-embedded accelerometers and their responses to 3 typical conditioned sessions (ie, strength, endurance, speed) in elite soccer players.Before immediately after each session, vertical jump (countermovement [CMJ]) adductor squeeze strength (groin) performances were recorded. Players also performed a 4-min run at 12 km/h followed by four ∼60-m runs (run = s,...

The aim of this study was to examine the impact maximal sprinting speed (MSS) on peak attained during soccer matches. Time-motion analysis running activity collected from 14 highly trained young male outfield footballers (8 wide midfielders [WM] and 6 central defenders [CD], 173.2 ± 0.06 m, 60.8 8.1 kg, 16.7 0.7 years) different friendly international club level 2 fastest players (a WM a CD) were compared with slower who played in same position. Each player's MSS determined using 10-m split...

The aim of the present study was to locate fastest 10-m split time (Split best ) over a 40-m sprint in relation age and maximal speed highly trained young soccer players. Analyses were performed on 967 independent player sprints collected 223 football players (Under 12 Under 18). defined as average running during Split . distribution distance associated with affected by ( X 2 3 = 158.7, P < .001), older players, greater proportion 30-to-40-m There was, however, no between-group difference...

The aim of this study was to examine in highly-trained young soccer players whether substantial changes either maximal sprinting speed (MSS) or aerobic (as inferred from peak incremental test speed, V(Vam-Eval)) can affect repeated high-intensity running during games. Data 33 (14.5±1.3 years), who presented MSS V(Vam-Eval) throughout 2 consecutive testing periods (~3 months) were included the final analysis. For each player, time-motion analyses performed using a global positioning system...

To compare the effect of low versus high volume eccentric-biased hamstring training programs on knee-flexor strength and fascicle length changes in elite soccer players.A total 19 youth players took part this study were randomly assigned into 2 subgroups. For 6 weeks in-season, groups performed either a low-volume (1 set per exercise; 10 repetitions total) or high-volume (4 sets; 40 repetitions) eccentric their knee flexors. After 6-weeks midtraining (MID), alternate regimen. Each consisted...

The purpose of this study was to investigate the relationship between maximal sprinting (MSS) and aerobic (MAS) speeds in a cohort highly-trained young male soccer players with influence body mass controlled for using allometric scaling. MSS MAS were obtained 14 pre-age at peak height velocity (APHV) (12.3 ± 0.7 years), 21 circum-APHV (14.3 0.9 year) 26 post-APHV (16.9 years). three groups showed similar positive correlations (r = 0.73 0.52; p < .01). In conclusion, our results suggest that...

Background Altitude exposure causes acute sleep disruption in non-athletes, but little is known about its effects elite athletes. The aim of this study was to examine the altitude on two groups athletes, that is, sea-level natives and high-altitude natives. Methods Sea-level were members Australian under-17 soccer team (n=14). High-altitude a Bolivian under-20 club (n=12). Teams participated an 18-day (19 nights) training camp Bolivia, with 6 nights at near sea level Santa Cruz (430 m) 13...

To examine the time course of wellness, fatigue and performance during an altitude training camp (La Paz, 3600 m) in two groups either sea-level (Australian) or (Bolivian) native young soccer players.Wellness were assessed using questionnaires resting heart rate (HR) HR variability. Physical was responses to a submaximal run, Yo-Yo Intermittent recovery test level 1 (Yo-YoIR1) 20 m sprint. Most measures performed daily, with exception Yo-YoIR1 sprints, which near sea on days 3 10 at...

Purpose : To compare between-tests changes in submaximal exercise heart rate (HR ex , 3 min, 12 km/h) and the speed associated with 4 mmol/L of blood lactate (V4mmol) soccer players to get insight into their level agreement respective sensitivity players’ fitness. Methods A total 19 elite professional (23 [3] y) performed 2 graded incremental treadmill tests (3-min stages interspersed 1 min passive recovery, starting 8 km/h, increment km/h until exhaustion or 18 if was not reached before)...

A low digit ratio (2D:4D) and 2D:4D in the right compared with left hand (right-left 2D:4D) are thought to be determined by high utero concentrations of testosterone, related "masculine" traits such as aggression performance sports like running rugby. Low right-left is also sensitivity testosterone measured number cytosine-adenine-guanine triplet repeats exon 1 androgen receptor gene. Here we show that associated maximal oxygen uptake (VO2(max)), velocity at VO2(max), maximum lactate...

Altitude training is used by elite athletes to improve sports performance, but it may also disrupt sleep. The aim of this study was examine the effects 2 weeks at high altitude on sleep young athletes.Participants (n=10) were members Australian under-17 soccer team an 18-day (19-night) camp in Bolivia, with six nights near sea level Santa Cruz (430 m) and 13 La Paz (3600 m). Sleep monitored using polysomnography during a baseline night 430 m three 3600 (immediately after ascent, 1 week...

To examine the ability of multivariate models to predict heart-rate (HR) responses some specific training drills from various global positioning system (GPS) variables and usefulness difference in predicted vs actual HR as an index fitness or readiness perform.All data were collected during 1 season (2016-17) with players' soccer activity recorded using 5-Hz GPS internal load monitored HR. analyzed typical small-sided games a 4-min standardized submaximal run (12 km·h-1). A multiple stepwise...

Aim: To quantify the occurrence of near-to-maximal speed-running bouts in elite soccer players.Methods: Tracking match data from 35 professional players (23 ± 3 yrs) were analysed over four seasons (2015-2019). The number runs reaching >80, >85 and >90% players' individual maximal sprinting speed (MSS) was computed. Differences peak occurrences between halves positions analysed.Results: Occurrences not different halves, but slightly-to-moderately position-dependent, with wingers (3.5 2.0...

The aim of this study was to examine the effect age and spa treatment (i.e. combined sauna, cold water immersion, jacuzzi) on match running performance over two consecutive matches in highly trained young soccer players. Fifteen pre- (age 12.8 ± 0.6 years) 13 post- (15.9 1 y) peak height velocity (PHV) players played (Matches 2) within 48 h against same opposition, with no specific between-match recovery intervention (control). Five post-PHV also completed another set matches, implemented...

Objectives We investigated the effect of high altitude on match activity profile elite youth and sea level residents. Methods Twenty Sea Level (Australian) 19 Altitude-resident (Bolivian) soccer players played five games, two near (430 m) three in La Paz (3600 m). Match was quantified via global positioning system with peak 5 min period for distance ((D 5peak )) velocity running (&gt;4.17 m/s, HIVR ); as well immediately subsequent to both (D 5sub ) high-velocity (HIVR identified using a...

This study compares different approaches to monitor changes in jump and sprint performance while using either the best or average of repeated trials. One hundred two highly trained young footballers (U13 U17) performed, 2 testing sessions separated by 4 mo, 3 countermovement jumps (n = 87) sprints 98) over 40 m with 10-m splits assess acceleration (first 10 m) maximal sprinting speed (best split, MSS). Standardized group-average between periods typical error (TE) were calculated compared for...

To (1) compare the locomotor and heart rate responses between floaters regular players during both small large small-sided games (SSGs) (2) examine whether type of game (ie, simulation [GS] vs possession [PO]) affects magnitude difference players.Data were collected in 41 belonging to an elite French football team 3 consecutive seasons (2014-2017). A 5-Hz global positionning system was used collect all training data, with Athletic Data Innovation analyzer (v5.4.1.514) derive total distance...