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Kinetic Response to Stride Frequency Perturbations During Treadmill Running: 2185 Board #337 June 2, 2: 00 PM - 3: 30 PM.

RESULTS: During the downhill conditions, Ve increased (61.1 to 65.6 L/min; p=.017) and HR increased (141 to 151 bpm; p=.010) from fastest cadence to slowest cadence, with no difference in energy cost or VO2 among the conditions (both p>.05). As cadence increased among the downhill conditions, step length decreased and step width increased (both p<.05). GRF values progressively increased in the downhill conditions from fastest to slowest cadence (16.7 to 17.5 Nm; p=.029). Among ankle, knee and hip powers, knee power values increased from fastest to slowest cadence (9.5 to 12.2 Watts; p=.023). CONCLUSIONS: When compared to the control condition, running downhill with a progressively faster cadence increases cardiopulmonary and biomechanical responses, but not metabolic responses. The findings suggest that runners maintain energetic cost among different cadence conditions by making adjustments to muscle activation patterns when running downhill. This muscle recruitment concept could be tested using similar cadence conditions described here during flat, uphill and downhill running.