Objective:　This　study　was　to　quantitatively　investigate　the　effects　of　force　load,　muscle　fatigue　and　extremely　low　frequency　(ELF)　magnetic　stimulation　on　electroencephalography　(EEG)　signal　features　during　side　arm　lateral　raise　task.　Approach:　EEG　signals　were　recorded　by　a　BIOSEMI　Active　Two　system　with　Pin-Type　active-electrodes　from　18　healthy　subjects　when　they　performed　the　right　arm　side　lateral　raise　task　(90　degrees　away　from　the　body)　with　three　different　loads　(0　kg,　1　kg　and　3　kg;　their　order　was　randomized　among　the　subjects)　on　the　forearm.　The　arm　maintained　the　loads　until　the　subject　felt　exhausted.　The　first　10　s　recording　for　each　load　was　regarded　as　non-fatigue　status　and　the　last　10　s　before　the　subject　was　exhausted　as　fatigue　status.　The　subject　was　then　given　a　5　min　resting　between　different　loads.　Two　days　later,　the　same　experiment　was　performed　on　each　subject　except　that　ELF　magnetic　stimulation　was　applied　to　the　subject＇s　deltoid　muscle　during　the　5　min　resting　period.　EEG　features　from　C3　and　C4　electrodes