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PILOT STUDY: IMPACT OF 2.4-KG PROXIMAL EXTERNAL LOADING ON 10-KM RUN PERFORMANCE IN RECREATIONALLY COMPETITIVE RUNNERS

Abstract

Victor A. Alves, Savanna N. Knight, Tate M. Dean, Bandar A. Alghamdi, Brett A. Davis, Lauren G. Killen, Hunter S. Waldman, Eric K. O'Neal. University of North Alabama, Florence, AL.

BACKGROUND: Recreationally competitive runners typically have higher variability in body fat percentage than elite distance runners. For runners with higher body fat percentages, modest decreases in non-lean mass is achievable and could potentially improve performance. This pilot study examined the performance and metabolic effects of artificially increasing trunk mass with a 2.4 kg, gel-based weighted compression garment. METHODS: Trained runners of various skill level (M = 10, F =6, age = 40 ± 9 years) completed two outdoor 10-km runs on a familiar and challenging course without (CON, first run) and with the weighted compression garment (LOAD, second run). Runners were instructed to finish the CON with a session RPE of ~7 on a 10-point scale. LOAD took place 7-14 days later with a goal to match CON pace (announced every 2.5-km). In a third laboratory session, running economy (RE) was assessed under both conditions at CON pace (1% grade). RESULTS: Runners were able to maintain pace under LOAD (CON = 52.37 ± 6.14, LOAD = 52.86 ± 7.44 min), but experienced an increase in cardiovascular strain for the last half of the run (heart rate ~8 beats/min higher during 5.0-7.5 and 7.5-10-km splits (p < 0.05) and perceptual (session RPE = 71 ± 10 vs 84 ± 10 cm) disadvantages. Similar trends in heart rate and RPE were found during RE trials, but unlike performance, RE was impaired (p = 0.03) by LOAD (13.8 ± 2.9 vs 13.0 ± 2.6 kcal/min). CONCLUSIONS: The high variance from the mixed-sex sample and non-true time trial design may have clouded running performance statistical outcomes, but this data suggests that even modest changes in body mass may influence recreationally trained runners’ competition abilities.

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