The placement of linear transducers affects the magnitude but not the intra-session reliability of kinematic variables during the bench press exercise

IF 0.6 4区 医学 Q4 ENGINEERING, BIOMEDICAL Isokinetics and Exercise Science Pub Date : 2022-02-18 DOI:10.3233/ies-220001
Alejandro Pérez-Castilla, Sergio Miras-Moreno, Agustín J. García-Vega, Amador García-Ramos
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Abstract

BACKGROUND: While linear transducers are the most accurate velocity monitoring devices, the horizontal motion of the barbell seems to affect its measurement error. OBJECTIVE: To explore the effect of cable inclination of the GymAware and T-Force linear transducers on the intra-session reliability and magnitude of kinematic variables during the Smith machine bench press exercise. METHODS: Twenty-eight resistance-trained males performed 2 blocks of 12 repetitions (4 repetitions at 40-60-80%1RM). In half of the repetitions with each load the two measuring systems were either vertically aligned with the barbell or positioned 15-cm away from the vertical projection of the barbell. RESULTS: Displacement and mean velocity variables were recorded with a high and comparable intra-session reliability regardless of the cable position and measuring system (CV=𝑟𝑎𝑛𝑔𝑒 1.79–8.38%; ICC=𝑟𝑎𝑛𝑔𝑒 0.69–0.98). The inclined cable position provided a lower displacement and mean velocity than the vertical cable position and the differences were comparable using both the GymAware (⩽ 1.52 cm; ⩽ 0.05 m⋅s-1) and T-Force (⩽ 1.53 cm; ⩽ 0.04 m⋅s-1). CONCLUSIONS: These results indicate that repeatable findings of kinematic variables can be obtained regardless of the cable position, but for comparative purposes, the cable position should remain constant from the start to the end of the lifts.
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在卧推运动中,线性换能器的位置影响运动变量的大小,但不影响运动变量的内部可靠性
背景:虽然线性传感器是最精确的速度监测设备,杠铃的水平运动似乎影响其测量误差。目的:探讨GymAware和T-Force线性传感器的电缆倾角对Smith机器卧推运动中运动变量的可靠性和大小的影响。方法:28名受过阻力训练的男性进行了2组12次重复(4组40-60-80%1RM)。在每次负荷的一半重复中,两个测量系统要么与杠铃垂直对齐,要么放置在距离杠铃垂直投影15厘米的地方。结果:无论电缆位置和测量系统如何,记录的位移和平均速度变量具有很高的可靠性和可比性(CV=𝑟𝑎𝑛𝑔𝑒1.79-8.38%;ICC =𝑟𝑎𝑛𝑔𝑒0.69 - -0.98)。斜拉索位置提供的位移和平均速度比垂直拉索位置低,使用GymAware(≥1.52 cm;≥0.05 m·s-1)和T-Force(≥1.53 cm;±0.04 m·s-1)。结论:这些结果表明,无论电缆位置如何,都可以获得可重复的运动学变量结果,但为了比较,电缆位置应从电梯开始到结束保持不变。
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来源期刊
Isokinetics and Exercise Science
Isokinetics and Exercise Science 医学-工程:生物医学
CiteScore
1.20
自引率
14.30%
发文量
37
审稿时长
>12 weeks
期刊介绍: Isokinetics and Exercise Science (IES) is an international journal devoted to the study of theoretical and applied aspects of human muscle performance. Since isokinetic dynamometry constitutes the major tool in this area, the journal takes a particular interest in exploring the considerable potential of this technology. IES publishes studies associated with the methodology of muscle performance especially with respect to the issues of reproducibility and validity of testing, description of normal and pathological mechanical parameters which are derivable from muscle testing, applications in basic research topics such as motor learning paradigms and electromyography. The journal also publishes studies on applications in clinical settings and technical aspects of the various measurement systems employed in human muscle performance research. The journal welcomes submissions in the form of research papers, reviews, case studies and technical reports from professionals in the fields of sports medicine, orthopaedic and neurological rehabilitation and exercise physiology.
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