"Three or four games after the change you notice an improvement in performances but it doesn't last," said one of the authors of the study, Alexandra Tippenhauer, whose father, Hans-Dieter Tippenhauer, was a Bundesliga coach and was sacked by Arminia Bielefeld in 1980.
Magath, the vice-president of the Association of German Football Teachers (BDFL), said sacking the coach had lasting negative effects.
"A new coach brings a new conception, which means not only coaches come and go, but also players," he said. "That makes it extremely difficult to follow a coherent transfer policy and to build a team on solid foundations."
All that suggests Hamburg SV might have been more inspired to stick with Jara. But don't tell him that, he knows it already.
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