Power of counter movement jumps with external load – coherence of three assessment methods

BMC Research Notes

Åsa B Tornberg¹  Ida Edvardsson²  Marie Hilmersson³ 

[1] Genetic & Molecular Epidemiology (GAME) Unit, Lund University Diabetes Center (LUDC) Clinical Research Center, Skåne University Hospital, Malmö, Sweden;Surgical and Preoperative Science, Sports Medicine, Umeå University, Umeå, Sweden;Department of Health Sciences, Physiotherapy, Lund University, Baravägen 3, Lund, 221 85, Sweden

关键词: Reliability;    Jump ability;    Neuromuscular capacity;    Power;    Muscle strength;   

Others  :  1177883
DOI  :  10.1186/s13104-015-1122-z

 received in 2013-10-31, accepted in 2015-04-10,  发布年份 2015

【 摘 要 】

Background

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.

Methods

Twenty-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).

Results

The 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 (r_p = 0.95-0.98). The results showed a high test-retest reliability for all indices assessed with the M-encoder, AP (r_p = 0.97, p < 0.001; TE% = 3.9%), AF (r_p = 0.99, p < 0.001; TE% = 1.4%). Furthermore, the AV had high values (r_p = 0.94, p < 0.001; TE% = 2.9%) as well as D (r_p = 0.87, p < 0.001; TE% = 5.4%).

Conclusion

It 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.

【 授权许可】

   
2015 Hilmersson et al.; licensee BioMed Central.

【 图 表 】

Figure 1.

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