Abstract
BackgroundThe purpose of this study was to evaluate the coherence between three different methods assessing the power driven from a counter movement jump (CMJ); the Powertimer 300-series contact mat (C-mat), the MuscleLab 4010 infrared mat (IR-mat) and the MuscleLab 4010 linear encoder (M-encoder), and to evaluate the test-retest reliability of the M-encoder.MethodsTwenty-two males and 29 female, elite athletes performed two test sessions with three days in between. Each test session included counter movement jumps (CMJ) performed on a Smith-machine with external loads of 40 kg. Jump height and flight time were assessed with C-mat and IR-mat, and power was additionally assessed with C-mat. Variables analyzed from the M-encoder were average power (AP), average force (AV), average velocity (AV), and distance (D).ResultsThe results from the C-mat were systematically higher than the ones obtained from the M-encoder and IR-mat. The correlation between the C-mat, M-encoder and the IR-mat was strong (rp = 0.95-0.98). The results showed a high test-retest reliability for all indices assessed with the M-encoder, AP (rp = 0.97, p < 0.001; TE% = 3.9%), AF (rp = 0.99, p < 0.001; TE% = 1.4%). Furthermore, the AV had high values (rp = 0.94, p < 0.001; TE% = 2.9%) as well as D (rp = 0.87, p < 0.001; TE% = 5.4%).ConclusionIt is important to use the same equipment in both pre- and post-testing, since all three methods were reliable, coherent but not interchangeable to each other.
Highlights
The purpose of this study was to evaluate the coherence between three different methods assessing the power driven from a counter movement jump (CMJ); the Powertimer 300-series contact mat (C-mat), the MuscleLab 4010 infrared mat (IR-mat) and the MuscleLab 4010 linear encoder (M-encoder), and to evaluate the test-retest reliability of the M-encoder
Since no main effect was seen by session between the men and women (Table 1), the groups were analyzed as one group to increase the statistical power of the calculations
Assessments of flight time and jump height gave higher values assessed with the C-mat compared to the IR-mat in ms and cm respectively
Summary
The purpose of this study was to evaluate the coherence between three different methods assessing the power driven from a counter movement jump (CMJ); the Powertimer 300-series contact mat (C-mat), the MuscleLab 4010 infrared mat (IR-mat) and the MuscleLab 4010 linear encoder (M-encoder), and to evaluate the test-retest reliability of the M-encoder. Generating high power is important for many elite athletes and the use of loaded vertical jumps as an exercise-training method has been shown to be effective to increase muscular strength and power [3,4]. Vertical jumps are commonly used to assess an individual’s muscular strength and power [3,5,6]. Countermovement jump (CMJ) is one of the most commonly used vertical jump techniques to evaluate muscle strength, power, and jump height in athletes [3,7,8], and have been shown to be reliable during assessments of vertical jump power [9,10]
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