Dowsing and applied kinesiology are completely different approaches. The former relies on the subconscious mind and other influences. The latter is based on the body's physiological response to the truth. For more information read:
http://veritaspub.com/article_info.php?cArticlePath=1&articles_id=3
http://www.icak.com/akis/AKis.html?51,12
http://www.kinesiology.net/research.asp

Peace,

Robert