Effects of concurrent endurance and strength training on running economy and &OV0312;O2 kinetics

TLDR

Endurance training improves running economy and accelerates VO₂ kinetics, yet the effect of adding heavy weight training to endurance training remains unclear. The study aimed to determine how concurrent heavy‑weight and endurance training influences running economy and VO₂ kinetics in endurance athletes. Participants completed a 14‑week training program, with the endurance‑strength group performing two heavy‑weight sessions per week, and were evaluated before and after training using incremental running tests, a 3000‑m run, hopping power, and strength measurements. Concurrent heavy‑weight training enhanced running economy and maximal strength, but did not significantly change VO₂ kinetics or leg stiffness compared to endurance training alone.

Abstract

It has been suggested that endurance training influences the running economy (CR) and the oxygen uptake (.VO(2)) kinetics in heavy exercise by accelerating the primary phase and attenuating the .VO(2) slow component. However, the effects of heavy weight training (HWT) in combination with endurance training remain unclear. The purpose of this study was to examine the influence of a concurrent HWT+endurance training on CR and the .VO(2) kinetics in endurance athletes.Fifteen triathletes were assigned to endurance+strength (ES) or endurance-only (E) training for 14 wk. The training program was similar, except ES performed two HWT sessions a week. Before and after the training period, the subjects performed 1) an incremental field running test for determination of .VO(2max) and the velocity associated (V(.VO2max)), the second ventilatory threshold (VT(2)); 2) a 3000-m run at constant velocity, calculated to require 25% of the difference between .VO(2max) and VT(2), to determine CR and the characteristics of the VO(2) kinetics; 3) maximal hopping tests to determine maximal mechanical power and lower-limb stiffness; 4) maximal concentric lower-limb strength measurements.After the training period, maximal strength were increased (P < 0.01) in ES but remained unchanged in E. Hopping power decreased in E (P < 0.05). After training, economy (P < 0.05) and hopping power (P < 0.001) were greater in ES than in E. .VO(2max), leg hopping stiffness and the .VO(2) kinetics were not significantly affected by training either in ES or E.Additional HWT led to improved maximal strength and running economy with no significant effects on the .VO(2) kinetics pattern in heavy exercise.