iOS app using polling to retrieve newest data

Currently we have an iOS app in development which uses polling based method to retrieve latest data from the REST API only if the app is launched by the user. It will keep polling the server periodically for 3-5 seconds when the app is active. At the same time we are also using APNS service for push notification. The question is: If we submit this iOS app to the App Store, will it be rejected by Apple because of using periodically polling method? Apple has suggested the right way is to use APNS for status update in background.