A device that records muscular force and fatigue during physical work or exercise.
From 'ergon' (work) and '-graph' (writing instrument), this apparatus was developed in the 1880s by Italian physiologist Angelo Mosso to study muscle fatigue.
The ergograph was one of the first objective fitness trackers—instead of just saying 'I'm tired,' people could see their muscle's actual performance decline plotted on a drum, proving fatigue was measurable science.
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