Christophe A Hautier Author

Research Article Subscription

Influence of a Modified Step Frequency on Energy Cost of Running after a Downhill Run in Non-Expert Subjects

Author(s):

Pascal Balducci, Michel Clémençon, Karine Monteil, Yoann Blache, Robin Trama, Christophe A Hautier

Purpose: The purpose of this study was to examine the role of step frequency (SF) on energy cost of running (Cr) after a downhill run (DHR) of 7.5 km (-6.7% grade) run at about 80% of heart rate reserve.

Method: Pre- and post-DHR, force, stiffness and Cr at 70% of velocity at 2 V O • max were measured in twelve participants unaccustomed to mountain running. Post-DHR data were recorded at a freely chosen SF and at the pre-DHR SF.

Results: A DHR induced reductions in the knee extensors force (-15.7%, P<0.001) and leg stiffness (-3.2%, P<0.05), an increase in blood lactate concentration, a significant increase in creatine kinase activity and muscle soreness. The post-DHR freely chosen SF increased (p<0.001... view more»

Abstract HTML PDF