I would actually argue that the sensation from experiencing asphyxiation is not really an emotion but instead one of the most fundamental sensations any life form will experience. Just saying as I already argued that ratio is a layer above emotions. Having said that, Jujutsu (as well as all forms of martial arts and sports) are intertwined with emotional experience and needs. Jujutsu for example is probably one of the best physical therapies for adults to overcome fear of non-sexual physical contact. Also the whole idea around fighting other people in your spare time draws its inspiration from a desire to externalize negative emotions which are either too abstract or too challenging to address in a mental reflection process.