This creation system provides a kind of portable electronic devices arm set, cardiac rate is measured when being moved with what, and the information of cardiac rate is transmitted to the portable electronic devices for setting what portable electronic devices arm set, so that user knows its cardiac rate, and known more inconvenient cardiac rate detecting mode is solved, the portable electronic devices arm set of this creation includes arm set ontology and a cardiac rate arrangement for detecting. The arm covers this system with an accommodation groove, to accommodate a portable electronic devices. The cardiac rate arrangement for detecting system is arranged the what arm and covers ontology, include a power-supply unit, a cardiac rate sensing unit, an acceleration sensing unit, a signal processing unit and a signal transmission unit, and by the collocation of said elements, and cardiac rate information can be learnt for user.本創作係提供一種可攜式電子裝置臂套，用於運動時量測心跳率，並將心跳率的資訊傳輸至設於該可攜式電子裝置臂套的可攜式電子裝置，以供使用者知悉其心跳率，並解決習知較為不方便的心跳率偵測方式，本創作之可攜式電子裝置臂套包括一臂套本體以及一心跳率偵測裝置。該臂套本體係具有一容置槽，用以容置一可攜式電子裝置。該心跳率偵測裝置係設置於該臂套本體，包含一電源供應單元、一心跳率感測單元、一加速度感測單元、一訊號處理單元及一訊號傳輸單元，並藉由上述元件的搭配，而可將心跳率資訊供使用者得知。
