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Combining interconnected wearables provides fascinating opportunities likeaugmenting exergaming with virtual coaches, feedback on the execution of sportsactivities, or how to improve on them. Breathing rhythm is a particularlyinteresting physiological dimension since it is easy and unobtrusive to measureand gained data provide valuable insights regarding the correct execution ofmovements, especially when analyzed together with additional movement data inreal-time. In this work, we focus on indoor rowing since it is a popular sportthat's often done alone without extensive instructions. We compare a visualbreathing indication with haptic guidance in order for athletes to maintain acorrect, efficient, and healthy breathing-movement-synchronicity (BMS) whileworking out. Also, user experience and acceptance of the different modalitieswere measured. The results show a positive and statistically significant impactof purely verbal instructions and purely tactile feedback on BMS and nosignificant impact of visual feedback. Interestingly, the subjective ratingsindicate a strong preference for the visual modality and even an aversion forthe haptic feedback, although objectively the performance benefited most fromusing the latter.

Impact of Tactile and Visual Feedback on Breathing Rhythm and User Experience in VR Exergaming