The reliability and validity of repeat power ability assessments and measurement indices in loaded vertical jumps

PeerJ

article

Alex O. Natera¹  Dale W. Chapman³  Neil D. Chapman¹  Justin W.L. Keogh¹ 

[1] Faculty of Health Sciences and Medicine, Bond University;Sport Science, New South Wales Institute of Sport;Curtin School of Allied Health, Curtin University;Sports Performance Research Centre New Zealand, Auckland University of Technology;Cluster for Health Improvement, Faculty of Science, Health, Education and Engineering, University of the Sunshine Coast;Kasturba Medical College

关键词: Power output;    Vertical jump;    Repeat power ability;    Fatigue index;    Percent decrement;    Power endurance;    Ballistic;    Anaerobic capacity;    High intensity;    Loaded jumps;   

DOI  :  10.7717/peerj.15553

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundRepeat power ability (RPA) assessments are a valuable evaluation of an athlete’s ability to repeatedly perform high intensity movements. Establishing the most reliable and valid loaded jump RPA assessment and method to quantify RPA has yet to be determined. This study aimed to compare the reliability and validity of an RPA assessment performed with loaded squat jumps (SJ) or countermovement jumps (CMJ) using force-time derived mean and peak power output.Materials and MethodsRPA was quantified using calculations of average power output, a fatigue index and a percent decrement score for all repetitions and with the first and last repetitions removed. Validity was established by comparing to a 30 second Bosco repeated jump test (30BJT). Eleven well-trained male field hockey players performed one set of 20 repetitions of both SJs (20SJ) and CMJs (20CMJ) on separate occasions using a 30% one repetition maximum half squat load. These assessments were repeated 7 days apart to establish inter-test reliability. On a separate occasion, each participant performed the 30BJT.ResultsThe reliability of average peak power for 20SJ and 20CMJ was acceptable (CV 0.9), while average mean power reliability for 20CMJ (CV 0.8). Percent decrement of 20CMJ peak power, with the first and final jump removed from the percent decrement calculation (PD%CMJpeak18), was the most reliable measurement of power output decline (CV 0.8). Average mean and peak power for both RPA protocols had moderate to strong correlations with 30BJT average mean and peak power (r = 0.5–0.8; p< 0.05–0.01). No RPA measurements of power decline were significantly related to BJT measurements of power decline.ConclusionsThese findings indicate that PD%CMJpeak18 is the most reliable measure of RPA power decline. The lack of relationship between power decline in the loaded RPA and the 30BJT assessment suggest that each assessment may be measuring a different physical quality. These results provide sport science practitioners with additional methods to assess RPA and provide useful information on the reliability and validity of these outcome measures. Additional research needs to be performed to examine the reliability and validity of the novel RPA assessments in other athletic populations and to determine the sensitivity of these measurements to training and injury.

【 授权许可】

CC BY