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The Interference Effects of Training for Strength and Endurance Simultaneously

Hennessy Liam C.; Watson, Anthony W.S.
Journal of Strength and Conditioning Research: February 1994
Article: PDF Only

ABSTRACTThis study compared the effects of three preseason training programs on endurance, strength, power, and speed. Subjects were divided into four groups: the endurance (E) group completed a running endurance program 4 days · week−1; the strength (S) group trained 3 days · week−1; the S+E group combined S and E training programs 5 days · week−1; the control (C) group did not train. After 8 weeks, the E and S+E groups had similar gains in endurance running performance, the S group had no change, while the C group showed a decline. No strength gains were noted in the C or E groups, but strength gains were made in the S+E and S groups. Power (vertical jump performance) and speed (20-m sprint time) gains were noted only for the S group. These findings show that training for strength alone results in gains in strength, power, and speed while maintaining endurance. S+E training, while producing gains in endurance and upper body strength, compromises gains in lower body strength and does not improve power or speed.

This study compared the effects of three preseason training programs on endurance, strength, power, and speed. Subjects were divided into four groups: the endurance (E) group completed a running endurance program 4 days · week−1; the strength (S) group trained 3 days · week−1; the S+E group combined S and E training programs 5 days · week−1; the control (C) group did not train. After 8 weeks, the E and S+E groups had similar gains in endurance running performance, the S group had no change, while the C group showed a decline. No strength gains were noted in the C or E groups, but strength gains were made in the S+E and S groups. Power (vertical jump performance) and speed (20-m sprint time) gains were noted only for the S group. These findings show that training for strength alone results in gains in strength, power, and speed while maintaining endurance. S+E training, while producing gains in endurance and upper body strength, compromises gains in lower body strength and does not improve power or speed.

© 1994 National Strength and Conditioning Association