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Article Title

THE EFFECTS OF EXTERNAL-LOADING DURING DAILY LIVING ON JUMP PERFORMANCE IN RUGBY ATHLETES

Abstract

Anaëlle Charles1, Katherine Shelton1, Kayle Long1, Hannah Freeland1, Cortni Thomas1, Garrett Tedford1, Veronika Pribyslavska1, Eric M. Scudamore1 1Arkansas State University, Jonesboro, Arkansas

PURPOSE: The effects of external-loading during daily living (ELDL) on counter-movement jump(CMJ) and four continuous jump(4CJ) performance in collegiate rugby athletes were evaluated. METHODS: Eleven male collegiate rugby athletes participated in this study. Participants completed two familiarization trials before testing to reduce a learning effect. For baseline measurements, participants performed three CMJs and three sets of 4CJ. Afterwards, participants were randomly assigned to an ELDL (n= 7) or control group (n= 4). The ELDL group wore weighted vests for 3 weeks, ≥4 days/week, and for ≥8 hours/day outside of practice. Vest loads were approximately 10%, 12%, and 15% of individual participants’ body mass for the first, second and third week, respectively. Following the 3 weeks, participants returned for post-treatment testing. A force plate was used to quantify jump height, power, and ground contact time (GCT). Difference scores between post-treatment and baseline were calculated for jump height, jump power and GCT. A one-tail t-test was used to compare performance variables between groups. RESULTS: Table 1 contains descriptive statistics for the performance variables. There were no significant differences between the ELDL and control groups for jump height, power, and GCT. Notably, power during the CMJ approached significance (p= 0.06). In addition, a large effect size was found for power (d= 1.70) and height (d= 0.86) during the CMJ and for GCT (d= 1.31) during4CJs. CONCLUSION: ELDL may result in practical improvements in CMJ power and GCT performances, which can be beneficial for anaerobic athletes in sports such as rugby. However, the sample size was small and further testing is warranted.

Charles Table 1.docx (207 kB)
Table 1

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