Page is fine, so long as it is given context - here it is lacking that context a bit, I think.  Perhaps instead: "\c next loads the next page of results of data related to the central node item and appends it to the model data, while \c previous loads the previous page of results related to the central node item and prepends it to the model data.  Generally, timelines of data like posts or tweets are displayed with more recent data on top, and therefore \c next refers to older data and \c previous to newer data."