Submaximal Yo-Yo Tests

In addition to the six official yo-yo test versions as created by Jens Bangsbo, there are a few modified versions of the yo-yo test that have made changes to the original protocols for a specific purpose, such as this submaximal version.

The standard versions of the yo-yo test are maximal tests, meaning that the tests progress until volitional exhaustion. However, it is not always appropriate to conduct a maximal test on athletes, particularly during the competitive season or during the rehabilitation of an injured player. In these cases, you may want to conduct a submaximal test as a non-exhaustive alternative to monitor their fitness.

The yo-yo test has been used as a submaximal test, running only for a set number of sprints or time. In this way, all athletes who perform this test will do the same workload. Heart rate measurements during these sub-maximal versions of the yo–yo test can provide useful information about the fitness level of the athletes.

Bradley et al. (2011) used sub-maximal versions of the Yo–Yo IE2 test, lasting either 4 minutes (600 m) or 6 minutes (920 m). The Yo–Yo IR1 has also been used as the basis of the submaximal test used by Owen et al. (2017), running the first six minutes of the test, covering 720 meters.

Diagram of the Intermittent Recovery Level 1 Children's test, or YYIR1C

As all athletes in the submaximal test stop at the same point, they will not have a final test score to get a fitness rating or convert to VO2max. However, performance in these sub-maximal tests can be assessed by measuring the heart rate during and following the completion of the test. Owen et al. (2017) found that in elite youth soccer players the final heart rate at the end of the 6 minute test was the most reliable metric, while the heart rate after 2 minutes, expressed as a percentage of maximum value, was the most reliable recovery metric.

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