Stefan Altmann
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View article: Developmental trajectories of aerobic endurance performance in highly trained youth soccer players aged 14 to 19 years
Developmental trajectories of aerobic endurance performance in highly trained youth soccer players aged 14 to 19 years Open
Purpose We aimed to identify distinct clusters of developmental trajectories in aerobic endurance performance among highly trained youth soccer players aged 14 to 19 years, moving beyond traditional group-level analyses to characterize pot…
View article: AI in Bundesliga match analysis—expected possession value (EPV) vs. expected goals (xG) to predict match outcomes in soccer
AI in Bundesliga match analysis—expected possession value (EPV) vs. expected goals (xG) to predict match outcomes in soccer Open
With an increasing number of key performance indicators (KPIs) in soccer analytics, it is key to identify the most valuable KPIs. One approach to define a KPI's value is to assess its ability to predict match outcomes and future performanc…
View article: Touch restriction during small-sided games in soccer—effects on physiological, physical and technical and tactical performance
Touch restriction during small-sided games in soccer—effects on physiological, physical and technical and tactical performance Open
Limited time and space availability during matches forces soccer players to utilize one-touch (1-touch) or two-touch (2-touch) passes to successfully maintain ball possession. Consequently, coaches replicate game demands during training, i…
View article: Investigating the isolated effects of a soccer-specific mental fatigue manipulation on different task types
Investigating the isolated effects of a soccer-specific mental fatigue manipulation on different task types Open
Introduction Mental fatigue negatively impacts athletic performance, but commonly employed tasks like the Stroop task often lack ecological validity. This study aimed to validate a modified, soccer-specific Footbonaut task as a mental fati…
View article: Reference standards for power at the lactate threshold 2 for cycle ergometry throughout the lifespan in Germany
Reference standards for power at the lactate threshold 2 for cycle ergometry throughout the lifespan in Germany Open
Cardiovascular fitness is an important health marker but reference values for the performance at lactate thresholds are lacking. This study aimed to provide reference standards for the performance on the cycle ergometer at fixed and indivi…
View article: The effect of relative pitch size on physiological, physical, technical and tactical variables in small-sided games: a literature review and practical guide
The effect of relative pitch size on physiological, physical, technical and tactical variables in small-sided games: a literature review and practical guide Open
Introduction Manipulating relative pitch size is a common practice in soccer training; however, published evidence on its true effects for practical coaching purposes has been lacking in the scientific literature. This review aimed to iden…
View article: Correlates of Aerobic Performance in Adolescents and Adults
Correlates of Aerobic Performance in Adolescents and Adults Open
Cardiorespiratory fitness (CRF) is considered as a main indicator of cardiovascular health and is associated with a reduced risk of noncommunicable diseases. The objective is to explore the potential behavioral, interpersonal, socioeconomi…
View article: Leading through performance crises: soccer coaches’ insights on their strategies—a qualitative study
Leading through performance crises: soccer coaches’ insights on their strategies—a qualitative study Open
Introduction Performance crises in sports are recognized as particularly stressful environments, where coaches are held responsible to a large extent for winning matches. During these challenging times, coaches play a crucial role, as thei…
View article: Anaerobic speed reserve and acute responses to a short-format high-intensity interval session in runners
Anaerobic speed reserve and acute responses to a short-format high-intensity interval session in runners Open
Acute biochemical, neuromuscular, and athlete-reported responses to short-format HIIT showed strong relationships with ASR and MSS, indicating higher internal load in athletes with a lower ASR and MSS by using a higher %ASR, compared to at…
View article: Concurrent validity of countermovement and squat jump height assessed with a contact mat and force platform in professional soccer players
Concurrent validity of countermovement and squat jump height assessed with a contact mat and force platform in professional soccer players Open
Purpose The aim of this study was to assess the concurrent validity of a contact mat against force plates to measure jump height in countermovement jump (CMJ) and squat jump (SJ) in professional soccer players. Methods 23 male professional…
View article: Assessment of Maximum Oxygen Uptake in Elite Youth Soccer Players: A Comparative Analysis of Smartwatch Technology, Yoyo Intermittent Recovery Test 2, and Respiratory Gas Analysis
Assessment of Maximum Oxygen Uptake in Elite Youth Soccer Players: A Comparative Analysis of Smartwatch Technology, Yoyo Intermittent Recovery Test 2, and Respiratory Gas Analysis Open
The maximum oxygen uptake (VO2max) is a critical factor for endurance performance in soccer. Novel wearable technology may allow frequent assessment of V̇O2max during non-fatiguing warm-up runs of soccer players with minimal interference to…
View article: Assessing anaerobic speed reserve: A systematic review on the validity and reliability of methods to determine maximal aerobic speed and maximal sprinting speed in running-based sports
Assessing anaerobic speed reserve: A systematic review on the validity and reliability of methods to determine maximal aerobic speed and maximal sprinting speed in running-based sports Open
Purpose Locomotor profiling using anaerobic speed reserve (ASR) enables insights into athletes’ physiological and neuromuscular contributing factors and prescription of high-intensity training beyond maximal aerobic speed (MAS). This syste…
View article: Transsacral epiduroscopy demonstrates high responder rate in patients with chronic non-specific (lumbo)sciatica - 12-month results of a single-center observational study
Transsacral epiduroscopy demonstrates high responder rate in patients with chronic non-specific (lumbo)sciatica - 12-month results of a single-center observational study Open
View article: The Success Factors of Rest Defense in Soccer – A Mixed-Methods Approach of Expert Interviews, Tracking Data, and Machine Learning
The Success Factors of Rest Defense in Soccer – A Mixed-Methods Approach of Expert Interviews, Tracking Data, and Machine Learning Open
While the tactical behavior of soccer players differs between specific phases of play (offense, defense, offensive transition, defensive transition), little is known about successful behavior of players during defensive transition (switchi…
View article: Advancing and critical appraisal of an integrative load monitoring approach in microcycles in professional soccer
Advancing and critical appraisal of an integrative load monitoring approach in microcycles in professional soccer Open
Despite load monitoring being considered an integral part of targeted performance management, including injury and illness prevention, there is currently no consensus of an effective monitoring system in professional soccer. Thus, the aims…
View article: Assessing Anaerobic Speed Reserve: A Systematic Review on the Validity and Reliability of Methods to Determine Maximal Aerobic Speed and Maximal Sprinting Speed in Running-based Sports
Assessing Anaerobic Speed Reserve: A Systematic Review on the Validity and Reliability of Methods to Determine Maximal Aerobic Speed and Maximal Sprinting Speed in Running-based Sports Open
Purpose. Locomotor profiling using anaerobic speed reserve (ASR) enables insights into athletes’ physiological and neuromuscular contributing factors and prescription of high-intensity training beyond maximal aerobic speed (MAS). Several m…
View article: Is ball-possession style more physically demanding than counter-attacking? The influence of playing style on match performance in professional soccer
Is ball-possession style more physically demanding than counter-attacking? The influence of playing style on match performance in professional soccer Open
In soccer, the offensive style of play describes characteristic behavioral features of the players at team level during the offensive phase of matches. This study aimed to investigate the effect of offensive playing style (i.e., while in b…
View article: Is a compact organization important for defensive success in elite soccer? – Analysis based on player tracking data
Is a compact organization important for defensive success in elite soccer? – Analysis based on player tracking data Open
The interest in tactical analysis in soccer has increased in the latest years, especially with the growing availability of player tracking data. With it, the defending team's compact organization, which is considered by practitioners to be…
View article: Training and match load ratios in professional soccer–should we use player- or position-specific match reference values?
Training and match load ratios in professional soccer–should we use player- or position-specific match reference values? Open
Careful load management is needed to optimize the physical capacity, a key performance component, of soccer players. The training load of soccer players is often expressed as a percentage of match load. However, no study has yet evaluated …
View article: Acute effects of moderate vs. vigorous endurance exercise on urinary metabolites in healthy, young, physically active men—A multi-platform metabolomics approach
Acute effects of moderate vs. vigorous endurance exercise on urinary metabolites in healthy, young, physically active men—A multi-platform metabolomics approach Open
Introduction: Endurance exercise alters whole-body as well as skeletal muscle metabolism and physiology, leading to improvements in performance and health. However, biological mechanisms underlying the body’s adaptations to different endur…
View article: Seasonal analysis of match load in professional soccer players: An observational cohort study of a Swiss U18, U21 and first team
Seasonal analysis of match load in professional soccer players: An observational cohort study of a Swiss U18, U21 and first team Open
The aim of this study was to quantify and compare various external match load measures in three age groups and leagues in male soccer (U18 in highest league of their age group vs U21 in fourth highest league vs first team in highest league…
View article: Does Algorithmic Trading Attenuate Asset Price Bubbles: An Experiment
Does Algorithmic Trading Attenuate Asset Price Bubbles: An Experiment Open
View article: Effective playing time affects physical match performance in soccer: An analysis according to playing position
Effective playing time affects physical match performance in soccer: An analysis according to playing position Open
This study aimed to analyse the influence of effective playing time on physical match performance according to playing position in professional soccer. Official match data from 267 matches (3,731 single observations) during the 2018/2019 s…
View article: Sprint and jump performances of female athletes are enhanced in the evening but not associated with individual chronotype
Sprint and jump performances of female athletes are enhanced in the evening but not associated with individual chronotype Open
Sprint and jump performances represent performance-determining parameters in individual and team sports. Fluctuations in performance depending on the daytime raise the question of the best time to train and compete. Given the scarce resear…
View article: The keys of pressing to gain the ball – Characteristics of defensive pressure in elite soccer using tracking data
The keys of pressing to gain the ball – Characteristics of defensive pressure in elite soccer using tracking data Open
Recently, the availability of big amounts of data enables analysts to dive deeper into the constraints of performance in various team sports. While offensive analyses in football have been extensively conducted, the evaluation of defensive…
View article: Daytime fluctuations of endurance performance in young soccer players: a randomized cross-over trial
Daytime fluctuations of endurance performance in young soccer players: a randomized cross-over trial Open
View article: Overestimation of maximal aerobic speed by the Université de Montréal track test and a 1500-m-time trial in soccer
Overestimation of maximal aerobic speed by the Université de Montréal track test and a 1500-m-time trial in soccer Open
Introduction: Maximal aerobic speed (MAS), usually measured by cardiopulmonary exercise testing (CPET) on a treadmill, is gaining popularity in soccer to determine aerobic performance. Several field tests are used to estimate MAS, although…
View article: Differences in Physical Match Performance and Injury Occurrence Before and After the COVID-19 Break in Professional European Soccer Leagues: A Systematic Review
Differences in Physical Match Performance and Injury Occurrence Before and After the COVID-19 Break in Professional European Soccer Leagues: A Systematic Review Open
View article: How Coaches Can Improve Their Teams’ Match Performance—The Influence of In-Game Changes of Tactical Formation in Professional Soccer
How Coaches Can Improve Their Teams’ Match Performance—The Influence of In-Game Changes of Tactical Formation in Professional Soccer Open
The tactical formation has been shown to influence the match performance of professional soccer players. This study aimed to examine the effects of in-game changes in tactical formation on match performance and to analyze coach-specific di…
View article: Does Technical Match Performance in Professional Soccer Depend on the Positional Role or the Individuality of the Player?
Does Technical Match Performance in Professional Soccer Depend on the Positional Role or the Individuality of the Player? Open
The aim of the study was to examine the impact of the positional role and the individuality on the technical match performance in professional soccer players. From official match data of the Bundesliga season 2018/19, technical performance…