## 1 Introduction
In the GBPT, peak oxygen uptake (VO\({}_{2}\)-peak), blood lactate concentration (BLC), heart rate (HR), sprinting time, time of offensive and defensive actions as well as running intensities time (in offence, defence, fast break and fast retreat), throwing velocity and jump height were measured [10]. The playing intensities during the GBPT were for the same players similar to the intensities during a team handball test game, and identical to the playing intensities found while analysing match performance in Danish elite team handball [1]. Furthermore, when comparing the physical and physiological variables, high correlations were found between the GBPT and the team handball test game. Rating of motivation, exertion and specificity of the GBPT showed that the players were highlymotivated to perform their personals best. Moreover, exertion during the test was very high and close to the exertion of a typical team handball game. Thus, the GBPT was proved to be very well-suited to measure team handball performance and closely reflects the physical performance during real team handball match-play. In another study, [PERSON] et al. [14] found that specific anaerobic and aerobic performance factors are pivotal for high-level performance in team handball, and to gain knowledge of these aspects for individual players, it is essential to measure the on-court performance of the players under conditions similar to competition match-play. The GBPT was proved to be appropriate to measure this. The well-known Yo-Yo tests were developed at the University of Copenhagen in Denmark in the mid-1990s for testing the physical, and more specifically, the locomotive performance of athletes while running back and forth on an indoor or outdoor court. These high recognized tests are applied world-wide and are used both in practical and research contexts. There has been special interest in the Yo-Yo intermittent recovery tests (the Yo-Yo IR tests), since they evaluate the athletes' ability to perform prolonged, intermittent and repeated intense exercise and with that, their potential to recover from intensive exercise. In many sports, for example team ball games like soccer and team handball, the exercise is namely intermittent, and the physical performance is related to the players' ability to repeatedly perform intense exercise throughout the entire game. The reproducibility and the validity of the Yo-Yo IR tests and the physiological response to the tests have been examined intensely [15; 16; 17; 18] and especially when related to elite soccer [19; 20; 21]. The Yo-Yo IR test may be performed at two different levels with different speed profiles (level 1 and 2). Level 1 (Yo-Yo IR1) starts at lower speed and with the increases in speed being more moderate than for the level 2 test (Yo-Yo IR2). For a trained person, the Yo-Yo IR1 lasts 10-20 min and is mainly focusing on an individual's ability to repeatedly perform intermittent exercise with a high aerobic component towards the end of the test, whereas the Yo-Yo IR2 lasts 5-15 min and aims at evaluating a trained person's ability to perform a repeated intense exercise bout with a high anaerobic energy contribution [15; 16]. Both tests evaluate the individual's ability to recover from intense exercise. Thus, the major difference between the two tests is the degree of activating the anaerobic system. However, the Yo-Yo IR1 test fully stimulates both systems for less trained persons and is therefore normally used to test male non-elite athletes, beginners and female athletes. Level 2 are mostly used to test male elite or sub-elite athletes. In general, the increases in speed in the level 2 version of the test are happening so fast that female athletes with a lower maximum speed compared to male athletes in most cases will reach near their maximum speed level very rapidly and thus experiencing fatigue before achieving their actual potential for performing repeated intense exercise.