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Open access

The Crucial Role of Elite Athletes and Expert Coaches With Academic Profiles in Developing Sound Sport Science

Karim Chamari

Open access

Wish List for Improving the Quality of Statistics in Sport Science

Kristin Sainani and Karim Chamari

Full access

The Game Is Fair Play: A Kind Reminder to Scientists About Their Role in Keeping Science Running

Karim Chamari and Ralph Beneke

Full access

Training for Elite Sport Performance: Injury Risk Management Also Matters!

Karim Chamari and Roald Bahr

Open access

Football Research Takes Center Stage

Iñigo Mujika and Karim Chamari

Free access

Performance Management in Elite Football: A Teamwork Modeling Approach

Joao Marques and Karim Chamari

Restricted access

The Usefulness of Session Rating of Perceived Exertion for Monitoring Training Load Despite Several Influences on Perceived Exertion

Monoem Haddad, Johnny Padulo, and Karim Chamari

Despite various contributing factors, session rating of perceived exertion has the potential to affect a large proportion of the global sporting and clinical communities since it is an inexpensive and simple tool that is highly practical and accurately measures an athlete’s outcome of training or competition. Its simplicity can help optimize performance and reduce negative outcomes of hard training in elite athletes.

Open access

The Pitch Invader—COVID-19 Canceled the Game: What Can Science Do for Us, and What Can the Pandemic Do for Science?

Daniel Bok, Karim Chamari, and Carl Foster

Restricted access

Decisive Moment: A Metric to Determine Success in Elite Karate Bouts

Montassar Tabben, Bianca Miarka, Karim Chamari, and Ralph Beneke

Purpose: To evaluate the concept of decisive moment (DM) as a novel analysis approach providing insights into factors leading to successful high-performance k umite karate outcomes using time–motion variables. DM represents the moment from which 1 of the 2 opponents uninterruptedly dominates the other until the end of the fight. Methods: A total of 120 elite seniors (60 men and 60 women) World Karate Federation combats were analyzed during 2 World Championships (2012 and 2014). Specific characteristics of karate combat (strategy, technique, tactic, target, and effectiveness) were evaluated and classified in 3 sections: at, before, and after DM. Results: DM occurred at about 49% (32.8%) of bout duration. Up to DM no clearly identifiable differences in performance characteristics were found between winners and losers. At and after DM, an offensive strategy with focus on upper-limb techniques, attack and counterattack, targeting the head showed highest potential to achieve and maintain dominance and to win. After DM, losers showed increasingly reactive techniques, mainly timed attacks and combinatory techniques. Conclusion: The DM concept presents a novel approach to time–motion analysis, which for the first time allowed identification of clear discriminating factors of success and defeat in kumite karate at the highest performance level.

Restricted access

The Activity Profile of Elite Low-Kick Kickboxing Competition

Maamer Slimani, Helmi Chaabene, Bianca Miarka, and Karim Chamari


To determine the performance aspects (time–motion and technical-tactical analysis) of top-level low-kick kickboxers according to gender, weight category, combat round, and match outcome.


Seventy-two kickboxers (44 male, 28 female) were studied. Thirty-six bouts (male = 61, female = 41 rounds) were analyzed using a time–motion system. Time structure was classified into 3 phases: preparatory-activity time (PT), fighting time (FT), and stoppage time (ST).


Referee decisions caused an overall effort:pause ratio (E:P) of ~1:1.5, with a significant difference between weight categories (light and middleweights = 1:1.5, heavyweight = 1:1). This ratio was ~1:6 when high-intensity actions–to-pause activities were considered. Significant differences were also observed between rounds (all P < .001), with 1st-, 2nd-, and 3rd-round E:Ps of 1:1, 1:1.5, and ~1:2, respectively. The relative times of FT and PT, total attacking actions, upper-limb actions, number of technical actions performed on the head, and the number of high-intensity actions were higher in males than females (all P = .05). Males performed more jab-cross actions and fewer low kicks than females (P < .001). Males used upper-limb (63.4%) more than lower-limb techniques (36.6%), targeting the head (56.9%) more than the body/leg (43.1%), with no significant difference from females (P > .05). E:P was similar between winners and losers. However, the numbers of technical actions performed on the head, counterattack actions, jab-cross technique, and total punches were higher in winners than losers (all P < .05).


Training programs need to be adapted to the specific requirements of kickboxers’ weight categories and gender to develop the technical-tactical abilities that improve athletes’ chances of winning.