No data exist on the electromyography (EMG) responses in children exposed to dynamic impacts. The objective of the current study was to measure the EMG responses of the neck, torso and lower extremity in children and adults during a low speed frontal impact. Low speed frontal impact tests were performed on seated and restrained pediatric (n=11, ages 8-14 years) and adult (n=9, ages 18-30 years) male subjects, utilizing a pneumatically actuated – hydraulically controlled sled. The safety envelope was defined as 4.9 g in 55.7 msec, and the actual pulse delivered to the subjects was 3.62 g in 62.6 msec for children and 3.82 g in 58.6 msec for adults. Subjects participated in six trials with 10 minute intervals between trials. Motion capture data and bilateral electromyography signals were measured during each trial. EMG data was processed by applying a bandpass (20-500 Hz) finite impulse response filter with a Kaiser windowing method. Additionally a root-mean-square method with a 25 msec averaging window was used and the mean of the prestimulus (trigger to event onset) noise was subtracted from the entire signal duration. Maximum voluntary isometric contractions (MVICs) were measured for each subject as they exerted their maximum force for 10 seconds in neck flexion, neck extension, torso extension and leg extension. Mean MVIC was found by averaging with a 25 msec window for the middle six seconds of the isometric contraction. Each signal obtained during the dynamic loading was normalized by that subject ’s mean MVIC for the corresponding muscle. The timing and magnitude of the EMG responses were compared between the pediatric and adult groups. These data could be used to model active musculature in computational models used in impact biomechanics studies.