Elite Ice Hockey Research Articles

Comparative Risk Analysis of Low Back Pain among Professional Football, Ice Hockey, and Floorball Athletes.

BACKGROUND Low back pain (LBP) is a common concern among professional athletes, potentially hindering performance and career longevity. However, comparative assessments of LBP prevalence and severity across various sports remain scarce. This study aimed to evaluate the factors associated with LBP in 388 professional athletes, including football, ice hockey, and floorball players. MATERIAL AND METHODS Conducted from June 2021 to September 2022, this cross-sectional study incorporated 388 athletes from national elite clubs, including football (n=148), ice hockey (n=179), and floorball (n=61). The Oswestry Disability Index (ODI), comprising sections like pain intensity, self-care, lifting, walking, sitting, standing, sleeping, sexual life, social life, and traveling, was employed to evaluate spinal pain and disability. RESULTS The study found no significant disparities in the LBP assessment among the groups. The relative risk (OR) of LBP and disability varied among the sports: football players displayed a lower risk (OR=0.49; 95% CI 0.32-0.74, P≤0.001), while ice hockey players had a higher risk (OR=2.18; 95% CI 1.45-3.29, P≤0.001) compared to the others. In contrast, the risk for floorball players (OR=0.82; 95% CI 0.47-1.41) did not significantly deviate from that of the other two sports. CONCLUSIONS LBP prevalence stood at 42.6% for football players, 60.1% for ice hockey players, and 49.2% for floorball players. Among these, ice hockey players exhibited a 2.18-fold increased risk of developing LBP and associated disability when compared to their football and floorball counterparts.

About the Predictive Value of a 3D Multiple Object Tracking Device for Talent Identification in Elite Ice Hockey Players

ABSTRACT Purpose: The aim of this study is to verify if a single session on the NeuroTracker has predictive value in talent identification in ice hockey. Methods: Thirty-five male ice hockey players (aged 16-20) from the highest Canadian competition level for that age group participated in the study. A battery of tests (attention, working memory, time reproduction, pattern recognition, temporal equivalence, technical ability, and decision-making) was administered to verify the relation between various cognitive abilities, on-ice performance, and the baseline score on the NeuroTracker, which is claimed to solicit multiple cognitive functions. On-ice performance indicators were game-related statistics: games played, points (mean per game), on-ice goals differential, and draft rank. Results: Results show that the baseline score on the NeuroTracker is not associated with draft ranking, nor is it able to predict which players will perform best based on game-related statistics. However, the NeuroTracker baseline score does correlate with various tests involving working memory and attention. Conclusion: Currently, NeuroTracker is not specific enough to allow talent identification among same-level elite athletes in ice hockey.

Relationship between body composition and anaerobic power with inter-limb difference dependence in Czech elite ice hockey players.

Ice hockey includes symmetrical as well as asymmetrical movements. As such, possible difference in mass and strength, as well as performance variables, may be observed between limbs. We examined the relation between body composition and lower extremity anaerobic power in Czech elite ice hockey players with the inter-limb difference dependence. In total, 168 ice hockey players (age = 20.81, Q1 = 18.24, Q3 = 28.75) underwent body composition measurement and Wingate Anaerobic Test (WAnT). The dominant (D) and non-dominant (ND) leg was established. A Wilcoxon Signed Rank was used. The difference between the dominant and non-dominant lower extremities was evaluated using the dimensionless analysis and by setting the value for the dominant leg at 100%. The difference in muscle mass (MM), fat mass (FM), and WAnT outcome variables (MP, RAP, MP5sP) between the right and left leg was greater than the difference between D and ND leg. Less total body fat mass (TBFM) and more total body muscle mass (TBMM) and lower extremities muscle mass (LEMM) were associated with higher WAnT outcome values. The dimensionless analysis showed a statistically significant correlation between almost all variables. More TBMF and LEMM and less TBFM was better for WAnT. The difference between the right and left leg was greater than the difference between D and ND leg. If there is a difference between MM and FM of lower limbs than there could be difference between the power of lower limbs as well.

Skating sprint performance and the influence of lower-body strength and power in professional and junior elite ice hockey athletes

ABSTRACT Skating sprint performance is essential for competitive success in ice hockey; however, it is unknown which component of a skating sprint is most critical for development throughout the performance pathway. Fifty-seven Swiss male ice hockey athletes were subjects (National League [NL], n = 22; Under 20 [U20], n = 20; Under 17 [U17], n = 15). Athletes performed: on-ice 30 m skating sprint, countermovement jump (CMJ), squat jump (SJ), and isometric mid-thigh pull (IMTP) tests in a single day. Linear mixed models, effect sizes and 95% confidence intervals were used to compare sprint performance and CMJ, SJ and IMTP between each performance level, with a correlation matrix used to determine the influence of lower-body strength and power on sprint performance. The NL and U20 athletes were significantly faster and had greater performance in most CMJ, SJ and IMTP variables compared to the U17 athletes, indicating minimum standards of lower-body strength and power are required to optimise technical performance. Significant differences were observed between NL and U20 for 10-20 m skating sprint split time and CMJ concentric relative peak and mean force, and reactive strength index-modified. Therefore, flying acceleration (10-20 m) is likely the most critical variable for pathway progression, with relative concentric force production the greatest influence.

Between-Session Reliability of Strength- and Power-Related Variables Obtained during Isometric Leg Press and Countermovement Jump in Elite Female Ice Hockey Players

Isometric leg press (ILP) and countermovement jump (CMJ) are commonly used to obtain strength- and power-related variables with important implications for health maintenance and sports performance. To enable the identification of true changes in performance with these measurements, the reliability must be known. This study evaluates the between-session reliability of strength- and power-related measures obtained from ILP and CMJ. Thirteen female elite ice hockey players (21.5 ± 5.1 years; 66.3 ± 8.0 kg) performed three maximal ILPs and CMJs on two different occasions. Variables from the ILP (peak force and peak rate of force development) and CMJ (peak power, peak force, peak velocity, and peak jump height) were obtained. The results were reported using the best trial, an average of the two best trials, or an average of three trials. The intraclass correlation coefficient (ICC) and coefficient of variation (CV) were high (ICC > 0.97; CV < 5.2%) for all outcomes. The CV for the CMJ (1.5–3.2%) was lower than that for the ILP (3.4–5.2%). There were no differences between reporting the best trial, an average of the two best trials, or an average of the three trials for the outcomes. ILP and CMJ are highly reliable when examining strength- and power-related variables in elite female ice hockey players.

A Proof-of-Concept Evaluation of the 1616 Story-Based Positive Youth Development Program.

The 1616 Program is a newly developed and evidence-informed story-based positive youth development (PYD) program for young ice hockey players (10-12 years of age) in North America. The program uses elite ice hockey players as role models-through story-telling-to serve as inspirational figures to engage youth athletes and important social agents (i.e., parents, coaches) with evidence-informed PYD concepts. The objective of this study was to use a Proof-of-Concept evaluation to assess whether the 1616 Program 'worked' in enhancing PYD outcomes and to determine if the concepts were engaging and enjoyable for youth, their parents, and coaches. The 5 week Proof-of-Concept evaluation was conducted with 11 ice hockey teams (n = 160 youths, 93 parents, and 11 coaches), encompassing both qualitative (e.g., focus groups) and quantitative (e.g., retrospective pretest-posttest questionnaires) processes and outcome assessments. Results showed that the program was well received by participants and positively impacted the intended outcomes. Overall, the data presented in this Proof-of-Concept evaluation was deemed to support the development and implementation of the full-scale 1616 Program for a more comprehensive evaluation.

Functional Movement Patterns, Spinal Posture and Prevalence of Musculoskeletal Symptoms among Elite Ice Hockey Players: A Cross Sectional Study.

The aim of this study was to evaluate functional movement patterns and spinal posture of elite ice hockey players and to examine the association between spinal posture, prevalence of musculoskeletal symptoms and Functional Movement Screen (FMSTM) scores. The study included 86 elite male ice hockey players aged 18 to 38 years. Sagittal spinal curvatures were measured with a Saunders digital inclinometer, and functional movement patterns were assessed by the FMSTM. Spinal posture of the studied ice hockey players was characterized by normal kyphosis (46%) or hyperkyphosis (41%) and decreased lumbar lordosis (54%). The mean total FMSTM score was 14.8. Most of the hockey players (57%) achieved a total FMSTM score in the range of 14-17 points, whereas 28% had a total FMSTM score of <14. Seventy-two percent of the studied athletes had at least one asymmetry. Significant differences between performing the movements on the right and the left sides of the body were observed in in-line lunges (p = 0.019) and shoulder mobility sub-tests (p < 0.001). The FMSTM sub-tests performed with the lowest success rates were rotatory stability and the hurdle step. A lower score in the rotatory stability test is related to shoulder pain. It is highly important to develop appropriate exercise programs to reduce or prevent muscle imbalances in ice hockey players.

Functional and hormone changes in ice hockey players using Cytoflavin

The purpose of the study was to assess the effect of 35-day Cytoflavin consumption on hormonal status, blood lactate level and functional parameters in elite ice hockey players. Material and methods: the study included 60 male professional hockey players (aged 19 to 36 years) divided into two groups of 30 subjects. Group I underwent a course of metabolic therapy with the use of succinic acid (Cytoflavin) for 35 days. Group II whose pharmacological support included only "basic" sports nutrition did not include succinic acid preparations or other metabolic agents. All patients underwent blood pressure and heart rate measurements, laboratory tests, pulse oximetry, ergospirometry. Trends in lactate levels in the blood and hormonal status in athletes were assessed. Moreover, such parameters as testing time, maximum heart rate, maximum oxygen consumption (VO2max), aerobic and anaerobic threshold pulse, time to reach the aerobic and anaerobic threshold were analyzed. Results: athletes who received a course of metabolic therapy on the 35th day of the preparatory period showed a significant increase in the indicators of maximum oxygen consumption (VO2max), the time of the test and the time of the anaerobic threshold (p&lt;0.05), which, against the background of a statistically significant decrease in lactate levels (p=0.014) indicates an improvement in aerobic performance and the possibility of faster recovery of athletes after physical exertion compared with athletes who did not receive metabolic therapy with succinic acid. Conclusion: The results obtained allow us to recommend the use of step therapy with succinic acid as a metabolic therapy for professional hockey players in the preparatory period.

Time domain adaptation of left ventricular diastolic intraventricular pressure in elite female ice hockey athletes.

Ice hockey is a high-intensity dynamic sport for which competitive athletes train for longer than 20 hours each week for several years. The cumulative time of myocardial exposure to hemodynamic stress affects cardiac remodeling. However, the intracardiac pressure distribution of the elite ice hockey athletes' heart during adaptation to long-term training remains to be explored. This study aimed to compare the diastolic intraventricular pressure difference (IVPD) of the left ventricle (LV) between healthy volunteers and ice hockey athletes with different training times. Fifty-three female ice hockey athletes (27 elite and 26 casual) and 24 healthy controls were included. The diastolic IVPD of the LV during diastole was measured by vector flow mapping. The peak amplitude of the IVPD during isovolumic relaxation (P0), diastolic rapid filling (P1), and atrial systole (P4); the difference in the peak amplitude between adjacent phases (DiffP01, DiffP14); the time interval between the peak amplitude of adjacent phases (P0P1, P1P4); and the maximum decrease rate in diastolic IVPD were calculated. Differences between groups, as well as correlations between hemodynamic parameters and training time, were analyzed. Structural parameters of the LV were significantly higher in elite athletes than in casual players and controls. No significant difference in the peak amplitude of the IVPD during the diastolic phase was found among the three groups. The analysis of covariance with heart rate as a covariate showed that P1P4 in the elite athlete and casual player groups was significantly longer than that in the healthy control group (p < 0.001 for all). An increased P1P4 was significantly associated with an increased training year (β = 4.90, p < 0.001). The diastolic cardiac hemodynamics of the LV in elite female ice hockey athletes could be characterized by a prolonged diastolic IVPD, and P1P4 prolonged with an increase in the training years, reflecting a time-domain adaptation in diastolic hemodynamics after long-term training.

Lower Limb Skeletal Robustness Determines the Change of Directional Speed Performance in Youth Ice Hockey.

The factors that influence the on-ice change of directional speed (COD) of ice hockey players remain unclear. Therefore, this study aimed to determine which off-ice and anthropometric variables determine hockey COD with and without a puck. Thirty-two elite ice hockey players (age: 17.64 ± 1.02 years, body height: 180 ± 7.5 cm, body mass: 76.4 ± 7.8 kg) performed squat jumps, broad jumps, countermovement jumps, and pull-ups and were assessed on agility office and on-ice, with and without a puck. Anthropometric characteristics were determined according to the modified somatotype method. A moderate correlation (r = 0.59-0.6) was observed among all agility tests, between on-ice agility with a puck and lower limb skeletal robustness (r = 0.45), and between on-ice agility with a puck and sit-and-reach scores (r = -0.50). Agility without a puck correlated with squat jump height (r = -0.36). Multiple regression analysis indicated that off-ice agility (β = 0.51) and skeletal robustness of the lower limbs (β = 0.35) determined (R2 = 0.41) on-ice agility with a puck. Players' COD was assessed by Illinois tests of agility off-ice and on-ice, with and without a puck; each of these tests moderately predicted the others, but differed in their physical constraints. Players with higher skeletal robustness used more strength and power to achieve COD performance, while players with lower skeletal robustness used techniques and skills to achieve COD, resulting in superior COD performance with a puck compared to stronger athletes. CODs with and without a puck are discrete skills requiring different abilities.

Prevalence of upper extremity pain and disability in elite football, ice hockey and floorball players

In athletes, injuries and medical conditions affecting the upper extremities are quite common. However, there has been limited research on the occurrence of joint pain in the peripheral upper extremities among elite athletes. Thus, this study aimed to determine how prevalent upper limb pain and disability are among team sports players, particularly in football, ice hockey and floorball. We also aimed to compare the severity of pain and disability among these sports and assess the risk of developing upper limb pain in athletes. This cross-sectional study was conducted between June 2021 and September 2022, involving 388 male elite athletes from national-level sports clubs. The prevalence of shoulder pain and disability was determined using the Shoulder Pain and Disability Index (SPI). Assessment of elbow pain and disability was conducted using the Oxford Elbow Score (OES), while wrist pain and disability were evaluated through the Patient-Rated Wrist Evaluation (PRWE). Significant differences in total SPI, OES and PRWE scores were observed among all groups. Ice hockey players experienced the highest levels of shoulder and wrist pain. Compared to football and floorball players, ice-hockey players had a 2.13 times higher risk of shoulder pain, with a pain incidence of 40.8%. Ice hockey also had a 1.71 times higher risk of wrist pain than football, with a pain prevalence of 26.3%. Notably, floorball players exhibited the most pronounced elbow pain, with a 13.18-fold higher risk than football and ice-hockey players and a pain prevalence of 67.2%. The study findings suggest that ice hockey players experience the highest pain levels in their right limbs, whereas football players have the lowest pain levels, underscoring the importance of dedicating more attention to developing innovative, effective and advanced preventive programs for athletes.

Prediction of Maximum Lactate Concentration During an All-Out Anaerobic Test in Elite Ice Hockey Players

Prediction of Maximum Lactate Concentration During an All-Out Anaerobic Test in Elite Ice Hockey Players

Hockey Dads, Party Boys, and Devoted Players? Digital Representations of Men and Masculinities amongst Norwegian and Swedish Ice Hockey Players

Men’s elite ice hockey is one of the most commercialised, popular, and patriarchal sports in the global North. With reference to the scarce corpus of ice hockey research from non-American countries, in this article we examine the online portrayals of men who play professional ice hockey in two clubs in Norway and Sweden. We pose two research questions and theoretically informed hypothetical assumptions associated with them that we evaluate with the overall aim of broadening the empirical scope of critical studies on men and masculinities in ice hockey. Using a quantitative content analysis, we compare and cross-analyse the online representations of men and masculinities by investigating the Instagram posts of 21 players from Frölunda HC and Vålerenga Hockey. The results demonstrate the importance of a situational and contextual understanding of hegemonic masculinity and broaden the scope of the “ice hockey playing man” that is often perceived as a narrow stereotype.

Differences in right hemisphere fNIRS activation associated with executive network during performance of the lateralized attention network tast by elite, expert and novice ice hockey athletes

ObjectiveWe investigated brain activity associated with executive control attention network in elite, expert, and novice female ice hockey athletes during the revised lateralized attention network tast to determine whether the neural correlates of performance differ by skill level. MethodsWe collected and analyzed functional near-infrared spectroscopy data of 38 participants while performing the revised lateralized attention network tast. ResultsElite players were significantly faster than novices (p = .005), and the experts’ overall accuracy rate (ACC) was higher than that of novices (p = .001). The effect of the executive network on reaction time was higher in novices than in elite players (p = .008) and experts (p = .004). The effect of the executive network on the ACC was lower in elite players than in experts (p = .009) and novices (p = .010). Finally, elite player had higher flanker conflict effects on RT (p = .005) under the invalid cue condition. the effect of the alertness network and orientation on the ACC was lower in elite players than in novices (p = .000) and experts (p = .022). Changes in the blood oxygen level-dependent signal related to the flanker effect were significantly different in the right dorsolateral prefrontal cortex (F=3.980, p = .028) and right inferior frontal gyrus (F=3.703, p = .035) among the three groups. Elit players showed more efficient executive control (reduced conflict effect on ACC) (p = .006)in the RH.The changes related to the effect of blood oxygen level on orienting were significantly different in the right frontal eye fields (F=3.883, p = .030) among the three groups, Accompanied by significant activation of the right dorsolateral prefrontal cortex(p = .026). ConclusionOur findings provide partial evidence of the superior cognitive performance and high neural efficiency of elite ice hockey players during cognitive tasks. These results demonstrate the right hemisphere superiority for executive control.We also found that specific brain activation in hockey players does not show a clear and linear relationship with skill level.

Association of Training and Game Loads to Injury Risk in Junior Male Elite Ice Hockey Players: A Prospective Cohort Study.

Training and game loads are potential risk factors of injury in junior elite ice hockey, but the association of training and game loads to injuries is unknown. To investigate the association of chronic training and game loads to injury risk in junior male elite ice hockey players. Cohort study; Level of evidence, 2. In this prospective cohort study, we monitored all health problems among 159 male junior ice hockey players (mean age, 16 years; range, 15-19 years) at sports-specific high schools during the 2018-2019 school year. Players reported their health problems every week using the Oslo Sports Trauma Research Center Overuse Questionnaire on Health Problems (OSTRC-H2). The number of training sessions and games was reported for 33 weeks. We calculated the previous 2-week difference in training/game loads as well as the cumulative training/game loads of the previous 2, 3, 4, and 6 weeks and explored potential associations between training/game loads and injury risk using mixed-effects logistic regression. The players reported 133 acute injuries, 75 overuse injuries, and 162 illnesses in total, and an average of 8.8 (SD ±3.9) training sessions and 0.9 (SD ± 1.1) games per week. We found no association between the difference of the two previous weeks or the previous 2- 3- and 4-week cumulative, training or game load and acute injuries, nor the difference of the two previous weeks, or the previous 4- and 6-week cumulative, training or game load and overuse injuries (OR, ∼1.0; P > .05 in all models). In the current study of junior elite ice hockey players, there was no evidence of an association between cumulative exposure to training/game loads and injury risk.

Four Weeks of Intensified Training Enhances On-Ice Intermittent Exercise Performance and Increases Maximal Oxygen Consumption of Youth National-Team Ice Hockey Players.

We investigated whether 4 weeks of intensified training consisting of speed endurance training (SET) enhanced high-intensity exercise performance in youth national-team ice hockey players. Utilizing a randomized crossover design, we subjected 17 players to 4 weeks of SET, comprising 6 to 10 × 20 seconds at maximal effort (>95% maximum ice skating speed) with 120-second recovery performed 3 times weekly, or maintenance of regular training (control period). Before and after each period, players completed ice-hockey-specific tests on ice, including a Yo-Yo Intermittent Recovery Level 1 test, a 30-m sprint test, and an agility test. On a separate day, players were assessed for body composition with dual-energy X-ray absorptiometry and performed countermovement jump, maximal voluntary isometric knee extensor contraction, a 15-second maximal sprint test, and a submaximal and incremental test on a bike ergometer in which pulmonary oxygen consumption was determined. Yo-Yo Intermittent Recovery Level 1 test performance increased (P < .001) by 14% (95% CI, 201-496 m) during the SET period. Maximal pulmonary oxygen consumption (P < .05) and time to exhaustion (P < .05) were 4.8% and 6.5% higher, respectively, after the SET period than before. Fat-free mass increased (P < .01) during the SET period by 1.7 kg (95% CI, 1.0-2.5), whereas fat mass remained unchanged. These effects were superior to the control period. These findings underpin the effectiveness of SET for improving on-ice high-intensity performance and highlight that elite ice hockey players can benefit from implementing SET.

Comparison of Dynamic-Static Balance Parameters of Elite Ice Hockey Players and Normal Individuals

Introduction: Our study aimed at stressing the significance of the vestibular system for ice hockey players, meanwhile focusing on the relation between the vestibular system and ice hockey for which balance is a significant factor. Our main aim was to compare the balance parameters of hockey players and normal individuals. Methods: Our experimental group consisted of 37 professional elite ice hockey players, and our control group consisted of 37 young males who have not previously been involved in sports as professionals. Participants had been subject to sensor organization test, adaptation test, weight-bearing/squat, unilateral stance, rhythmic weight-shifting tests of computerized dynamic posturography device. Results: Overall results indicate no significant difference between the control group and ice hockey players in the sensor organization test, which is caused by control group’s comprising adolescents with amateur sport involvement. In adaptation test and unilateral stance test, a significant difference was found between experimental and control groups. Discussion/Conclusions: This study determined the dynamic and static balance characteristics of ice hockey players. For this reason, it is useful to test the balance abilities of ice hockey players in static and dynamic conditions to evaluate their performance level. After testing individuals with vestibular problems with dynamic balance tests, appropriate sports exercises can be given to improve dynamic and static balance.

Functional Performance Tests, On-Ice Testing and Game Performance in Elite Junior Ice Hockey Players.

This study aimed to explore relationships between fitness, on-ice physical abilities and game performance among elite junior male ice hockey players. Twenty-one major junior ice hockey players (18.9 ± 1.4 years old) participated in the study. Measures including five fitness tests (anthropometric measures, pull up test, bench press test, broad jump, vertical jump) and three on-ice skating tests (multi-stage aerobic skating test, 44-m sprint test, and backward skating test) were assessed during their pre-season training camp. Game performance metrics (collected during the regular season) were collected using InStat software. Results of the (on-ice and off-ice) functional performance test protocol and on-ice tests were analyzed by evaluating correlation coefficients in multiple areas of game performance: 1) physical implication (body checks), 2) offensive contribution (expected goals for, types of zone entries), and 3) defensive actions (blocked shots, expected goals against). They revealed that performance in the broad jump test was associated with skating speed. Some significant correlations were also observed between on-ice test performance indicators such as received body checks, expected goals and blocked shots. In summary, results indicate that on-ice test protocols were associated with players’ performance in multiple aspects of the game. Partial correlation analyses revealed that some of these relationships were specific to the player's position. Forward skating was associated with forwards’ offensive play, and backward skating was specifically related with defensemen’s performance (offense and defense). The addition of on-ice physical tests appears essential for interpreting the results of ice hockey players' physical tests and integrating these results into players’ physical preparation and the in-season follow-up.

A mixed-methods examination of a mental health awareness program in elite ice hockey

ABSTRACT In partnership with the Canadian Mental Health Association, Ontario Division, the purpose of this study was to conduct a post-season evaluation of the effectiveness of a mental health and suicide-awareness program called Talk Today, delivered to elite adolescent male hockey players and their support staff. The study was conducted using a sequential explanatory mixed-methods design that began with a quantitative phase followed by a qualitative phase. In total, 105 participants (49 athletes, 56 staff) completed online questionnaires and 12 (6 athletes, 6 staff) participated in qualitative interviews. Results integrated quantitative and qualitative findings to examine participants’ perceptions of acceptability of the program, acquisition and application of knowledge, and perceptions of stigma following the program. Findings revealed that 78% of athletes and 90% of staff reported high levels of satisfaction with the program, 85% of athletes and 87% of staff felt they acquired knowledge on mental health including access to resources, and 68% of athletes and 87% of staff felt they could provide more effective support to individuals with mental health issues. Participants felt the program helped them to identify, approach, and support someone experiencing mental health issues. Additionally, participants reported lower levels of personal stigma in comparison to levels of public stigma towards persons with mental health problems. Overall, results suggest a high level of openness to a mental health and suicide-awareness program among elite male adolescent athletes. Given that this group typically holds negative attitudes towards mental health, these findings are promising for the future implementation of such programs.

Prove them wrong: Do professional athletes perform better when facing their former clubs?

In this paper, we investigated the influence of competition with a former employer on employees’ performance by examining how athletes in team sports play against their former clubs. Using the data on individual players’ performances in multiple seasons of the NBA, NHL, and major European soccer leagues, we constructed several PPML and OLS models to estimate the effect. Professional athletes executed more offensive actions against their former teams. Basketball players scored more points by making more shots but did not improve their accuracy. Ice hockey players, along with footballers in the English Premier League, also shot more. The effect strengthens in the away matches. In addition, the performance improvement is particularly apparent when athletes accumulated insufficient playing time in the former team, or accepted a wage reduction when transferring, or were waived. This study provides evidence that elite basketball, ice hockey, and soccer players perform better against their former clubs.