The effects of a short-term plyometrics program on the running economy and Achilles tendon properties of female distance runners

This study examined the effects of plyometrics on running economy, performance, and Achilles tendon properties in female distance runners. Seventeen University athletes matched by running economy were randomly assigned to an experimental group that received supplementary plyometrics training (n=9) or a control group that performed run-training only (n=8). Subject attrition led to a final sample of twelve runners (6 experimental, 6 controls). Measurements were made pre-post an 8-week training period. Running economy was measured as oxygen consumption at three submaximal speeds, performance as time to run 3000 meters, and Achilles tendon properties were estimated via ultrasound during ramp, quasi-isometric plantar flexion to maximum on an isokinetic dynamometer. No significant differences were found between the two groups after eight weeks because of poor subject compliance and excessive variability in ultrasound measurements. The results are inconclusive as to the effect of supplementary plyometric training on running economy, performance and Achilles tendon properties.

Investigates plyometrics' impact on running economy and Achilles tendon properties in female distance runners.