Does a linear position transducer placed on a stick and belt provide sufficient validity and reliability of countermovement jump performance outcomes?
Manufacturers recommend that linear position transducers (LPTs) should be placed on the side of a barbell (or wooden dowel) to measure countermovement jump (CMJ) height, but the validity and reliability of this placement have not been compared to other attachment sites. Since this recommended attach...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Termedia Publishing House
2021-04-01
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| Series: | Biology of Sport |
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| Online Access: | https://www.termedia.pl/Does-a-linear-position-transducer-placed-on-a-stick-and-belt-r-nprovide-sufficient-validity-and-reliability-of-countermovement-r-njump-performance-outcomes-,78,43690,1,1.html |
| _version_ | 1817998715776925696 |
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| author | Vladimír Hojka Petr Šťastný James J. Tufano Dan Omcirk Martin T. Janikov Martin Komarc Radim Jebavý |
| author_facet | Vladimír Hojka Petr Šťastný James J. Tufano Dan Omcirk Martin T. Janikov Martin Komarc Radim Jebavý |
| author_sort | Vladimír Hojka |
| collection | DOAJ |
| description | Manufacturers recommend that linear position transducers (LPTs) should be placed on the side of a barbell (or wooden dowel) to measure countermovement jump (CMJ) height, but the validity and reliability of this placement have not been compared to other attachment sites. Since this recommended attachment site is far from the centre of mass, a belt attachment where the LPT is placed between the feet may increase the validity and reliability of CMJ data. Thirty-six physical education students participated in the study (24.6 ± 4.3 years; 177.0 ± 7.7 cm; 77.2 ± 9.0 kg). Parameters from the two LPT attachments (barbell and belt) were simultaneously validated to force plate data, where the nature of bias was analysed (systematic vs random). The within-session and between-session reliability of both attachment sites were compared to force plate data using a test-retest protocol of two sets of 5 CMJs separated by 7 days. The LPT provided highly reliable and valid measures of peak force, mean force, mean power, and jump height, where the bias was mostly systematic (r2 > 0.7; ICC > 0.9). Peak velocity, mean velocity, and peak power were in very good agreement with the force plate and were highly reliable (r2 > 0.5; ICC > 0.7). Therefore, both attachment sites produced similar results with a systematic bias compared to force plate data. Thus, both attachment sites seem to be valid for assessing CMJs when the measuring tool and site remain consistent across measurements. However, if LPT data are to be compared to force plate data, recalculation equations should be used. |
| first_indexed | 2024-04-14T02:57:35Z |
| format | Article |
| id | doaj.art-fbaa00eb1f9f44518b7bdd31c0165d4d |
| institution | Directory Open Access Journal |
| issn | 0860-021X 2083-1862 |
| language | English |
| last_indexed | 2024-04-14T02:57:35Z |
| publishDate | 2021-04-01 |
| publisher | Termedia Publishing House |
| record_format | Article |
| series | Biology of Sport |
| spelling | doaj.art-fbaa00eb1f9f44518b7bdd31c0165d4d2022-12-22T02:16:03ZengTermedia Publishing HouseBiology of Sport0860-021X2083-18622021-04-0139234134810.5114/biolsport.2022.10491843690Does a linear position transducer placed on a stick and belt provide sufficient validity and reliability of countermovement jump performance outcomes?Vladimír HojkaPetr ŠťastnýJames J. TufanoDan OmcirkMartin T. JanikovMartin KomarcRadim JebavýManufacturers recommend that linear position transducers (LPTs) should be placed on the side of a barbell (or wooden dowel) to measure countermovement jump (CMJ) height, but the validity and reliability of this placement have not been compared to other attachment sites. Since this recommended attachment site is far from the centre of mass, a belt attachment where the LPT is placed between the feet may increase the validity and reliability of CMJ data. Thirty-six physical education students participated in the study (24.6 ± 4.3 years; 177.0 ± 7.7 cm; 77.2 ± 9.0 kg). Parameters from the two LPT attachments (barbell and belt) were simultaneously validated to force plate data, where the nature of bias was analysed (systematic vs random). The within-session and between-session reliability of both attachment sites were compared to force plate data using a test-retest protocol of two sets of 5 CMJs separated by 7 days. The LPT provided highly reliable and valid measures of peak force, mean force, mean power, and jump height, where the bias was mostly systematic (r2 > 0.7; ICC > 0.9). Peak velocity, mean velocity, and peak power were in very good agreement with the force plate and were highly reliable (r2 > 0.5; ICC > 0.7). Therefore, both attachment sites produced similar results with a systematic bias compared to force plate data. Thus, both attachment sites seem to be valid for assessing CMJs when the measuring tool and site remain consistent across measurements. However, if LPT data are to be compared to force plate data, recalculation equations should be used.https://www.termedia.pl/Does-a-linear-position-transducer-placed-on-a-stick-and-belt-r-nprovide-sufficient-validity-and-reliability-of-countermovement-r-njump-performance-outcomes-,78,43690,1,1.htmllinear position transducer force plate explosive strength jump height power |
| spellingShingle | Vladimír Hojka Petr Šťastný James J. Tufano Dan Omcirk Martin T. Janikov Martin Komarc Radim Jebavý Does a linear position transducer placed on a stick and belt provide sufficient validity and reliability of countermovement jump performance outcomes? Biology of Sport linear position transducer force plate explosive strength jump height power |
| title | Does a linear position transducer placed on a stick and belt
provide sufficient validity and reliability of countermovement
jump performance outcomes? |
| title_full | Does a linear position transducer placed on a stick and belt
provide sufficient validity and reliability of countermovement
jump performance outcomes? |
| title_fullStr | Does a linear position transducer placed on a stick and belt
provide sufficient validity and reliability of countermovement
jump performance outcomes? |
| title_full_unstemmed | Does a linear position transducer placed on a stick and belt
provide sufficient validity and reliability of countermovement
jump performance outcomes? |
| title_short | Does a linear position transducer placed on a stick and belt
provide sufficient validity and reliability of countermovement
jump performance outcomes? |
| title_sort | does a linear position transducer placed on a stick and belt provide sufficient validity and reliability of countermovement jump performance outcomes |
| topic | linear position transducer force plate explosive strength jump height power |
| url | https://www.termedia.pl/Does-a-linear-position-transducer-placed-on-a-stick-and-belt-r-nprovide-sufficient-validity-and-reliability-of-countermovement-r-njump-performance-outcomes-,78,43690,1,1.html |
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