■垂直刚度(Kvert)可用于评估运动员的运动表现和受伤风险。MyJump2智能手机应用程序(App),越来越多的被研究人员使用,教练,和竞技体育领域的球员。我们旨在分析MyJump2应用程序在男性大学球员中测量Kvert的可靠性和并发有效性。
■20名男性大学球员(10名足球运动员,10名篮球运动员;年龄,20.2±1.3岁;体重,76.4±6.0kg;高度,178.3±4.7cm)自愿参加本研究。参与者在力平台上从30厘米到40厘米进行了三次下降跳跃,并在三天后进行了重新测试。所有的跳跃都是由力量平台和MyJump2应用程序记录的。从上述两种设备获得的数据使用配对t检验进行比较,类内相关系数(ICC),变异系数(CV),皮尔逊积矩相关系数(r),Bland-Altman阴谋,和单向回归。
■Kvert值的测量仪器之间几乎完全吻合(ICC>0.972,95%CI=0.954-0.992,P<0.01)。在评估者之间观察到几乎完美的一致性(ICC>0.989,95%CI=0.981-0.997,P<0.05)。此外,MyJump2应用程序在所有参与者中显示出良好的评分者内部可靠性(ICC=1.000,95%CI=1.000-1.000,P<0.001).在T130cm处测量Kvert时,MyJump2显示出良好的变异性(CV=5.4%),T140厘米(CV=6.7%),T230厘米(CV=5.0%),和T240厘米(CV=10.3%)。MyJump2的重测可靠性在30厘米处中等至良好(ICC=0.708,95%CI=0.509-0.827);但是,在40cm处为中度至中度(ICC=0.445,95%CI=0.222-0.625).在力平台和Kvert的MyJump2之间观察到非常大的相关性(r>0.9655,P<0.001)。
■MyJump2智能手机应用程序在测量男性大学球员的Kvert时显示出出色的可靠性和评分者内部的一致性。同时证明了出色的评分者内部一致性和与力平台测量的强烈一致性,在较高的跳跃高度下,可靠性略低。总的来说,MyJump2应用程序是评估大学玩家Kvert的有效工具,仔细考虑其局限性,特别是在更高的跳跃高度。
UNASSIGNED: Vertical stiffness (Kvert) can be used to evaluate sports performance and injury risk in players. The My Jump 2 smartphone application (App), is increasingly being used by researchers, coaches, and players in the competitive sports field. We aimed to analyze the reliability and concurrent validity of the My Jump 2 app for measuring Kvert in male college players.
UNASSIGNED: Twenty male college players (10 soccer players, 10 basketball players; age, 20.2 ± 1.3 years old; weight, 76.4 ± 6.0 kg; height, 178.3 ± 4.7 cm) volunteered to take part in this study. Three drop jumps were performed by participants from 30 cm to 40 cm on a force platform and retested after three days. All the jumps were recorded by both the Force platform and the My Jump 2 app. Data obtained from the above two devices were compared using the paired t tests, intraclass correlation coefficient (ICC), coefficient of variation (CV), Pearson product moment correlation coefficient (r), Bland-Altman plots, and one-way regression.
UNASSIGNED: There was almost perfect agreement between measurement instruments for the Kvert value (ICC > 0.972, 95% CI = 0.954-0.992, P < 0.01). Almost perfect agreement was observed between evaluators (ICC > 0.989, 95% CI = 0.981-0.997, P < 0.05). Also, the My Jump 2 app showed excellent intra-rater reliability in all participants (ICC = 1.000, 95% CI = 1.000-1.000, P < 0.001). The My Jump 2 showed good variability when measuring Kvert at T1 30 cm (CV = 5.4%), T1 40 cm (CV = 6.7%), T2 30 cm (CV = 5.0%), and T2 40 cm (CV = 10.3%). The test-retest reliability of My Jump 2 was moderate to good at 30 cm (ICC = 0.708, 95% CI = 0.509-0.827); however, it was lower to moderate at 40 cm (ICC = 0.445, 95% CI = 0.222-0.625). Very large correlations were observed between the force platform and the My Jump 2 for Kvert (r > 0.9655, P < 0.001).
UNASSIGNED: The My Jump 2 smartphone application showed excellent reliability and intra-rater consistency in measuring Kvert in male college players. While demonstrating excellent intra-rater consistency and strong agreement with force platform measurements, it showed slightly lower reliability at higher jump heights. Overall, the My Jump 2 app is a valid tool for evaluating Kvert in college players with careful consideration of its limitations, particularly at higher jump heights.