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The modern structures are being built using high-strength and light-weight construction materials, resulting in decreased structural mass and damping properties. Rhythmic activities such as jumping, dancing and clapping during lively concerts can produce excessive vibration of structures. Generally the design process of rhythmic activities follows NBC or AISC, but each standards have some restrictions. Dynamic load factors for jumping were not suited in case that many participants stand densely and dynamic load factors for lively concerts were not sufficient on current tendency. Therefore, the tests were made to use force platform to consider the change of dynamic load factor according to the number of participants and the density of participant. The dynamic loads were measured directly from the dynamic force transducer and dynamic load factors were analyzed by Fast Fourier Transform. The tests were made 474 times and used the regression analysis. As a result, the dynamic load factor reduction formula was leaded according to the sort of rhythmic activities and the density of participants.