TY - JOUR
T1 - Validity and intra-rater reliability of MyJump app on iPhone 6s in jump performance
AU - Stanton, Robert
AU - Wintour, Sally Anne
AU - Kean, Crystal O.
N1 - Funding Information:
Sally-Anne Wintour is supported by a CQUniversity Summer Scholarship.
Publisher Copyright:
© 2016 Sports Medicine Australia
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Objectives Smartphone applications are increasingly used by researchers, coaches, athletes and clinicians. The aim of this study was to examine the concurrent validity and intra-rater reliability of the smartphone-based application, MyJump, against laboratory-based force plate measurements. Design Cross sectional study. Methods Participants completed counter-movement jumps (CMJ) (n = 29) and 30 cm drop jumps (DJ) (n = 27) on a force plate which were simultaneously recorded using MyJump. To assess concurrent validity, jump height, derived from flight time acquired from each device, was compared for each jump type. Intra-rater reliability was determined by replicating data analysis of MyJump recordings on two occasions separated by seven days. Results CMJ and DJ heights derived from MyJump showed excellent agreement with the force plate (ICC values range from 0.991 for CMJ to 0.993) However mean DJ height from the force plate was significantly higher than MyJump (mean difference: 0.87 cm, 95% CI: 0.69–1.04 cm). Intra-rater reliability of MyJump for both CMJ and DJ was almost perfect (ICC values range from 0.997 for CMJ to 0.998 for DJ); however, mean CMJ and DJ jump height for Day 1 was significantly higher than Day 2 (CMJ: 0.43 cm, 95% CI: 0.23–0.62 cm); (DJ: 0.38 cm, 95% CI: 0.23–0.53 cm). Conclusion The present study finds MyJump to be a valid and highly reliable tool for researchers, coaches, athletes and clinicians; however, systematic bias should be considered when comparing MyJump outputs to other testing devices.
AB - Objectives Smartphone applications are increasingly used by researchers, coaches, athletes and clinicians. The aim of this study was to examine the concurrent validity and intra-rater reliability of the smartphone-based application, MyJump, against laboratory-based force plate measurements. Design Cross sectional study. Methods Participants completed counter-movement jumps (CMJ) (n = 29) and 30 cm drop jumps (DJ) (n = 27) on a force plate which were simultaneously recorded using MyJump. To assess concurrent validity, jump height, derived from flight time acquired from each device, was compared for each jump type. Intra-rater reliability was determined by replicating data analysis of MyJump recordings on two occasions separated by seven days. Results CMJ and DJ heights derived from MyJump showed excellent agreement with the force plate (ICC values range from 0.991 for CMJ to 0.993) However mean DJ height from the force plate was significantly higher than MyJump (mean difference: 0.87 cm, 95% CI: 0.69–1.04 cm). Intra-rater reliability of MyJump for both CMJ and DJ was almost perfect (ICC values range from 0.997 for CMJ to 0.998 for DJ); however, mean CMJ and DJ jump height for Day 1 was significantly higher than Day 2 (CMJ: 0.43 cm, 95% CI: 0.23–0.62 cm); (DJ: 0.38 cm, 95% CI: 0.23–0.53 cm). Conclusion The present study finds MyJump to be a valid and highly reliable tool for researchers, coaches, athletes and clinicians; however, systematic bias should be considered when comparing MyJump outputs to other testing devices.
KW - Jump height
KW - Muscle power
KW - Physical performance
KW - Skill development
KW - Strength
UR - http://www.scopus.com/inward/record.url?scp=85006931054&partnerID=8YFLogxK
U2 - 10.1016/j.jsams.2016.09.016
DO - 10.1016/j.jsams.2016.09.016
M3 - Article
C2 - 27876280
AN - SCOPUS:85006931054
SN - 1440-2440
VL - 20
SP - 518
EP - 523
JO - Journal of Science and Medicine in Sport
JF - Journal of Science and Medicine in Sport
IS - 5
ER -