There is no bilateral deficit of torque and rate of torque development of knee extensors during isometric exertion when measured by two independent isokinetic machines
- 25.06.2023
- Research
Erschienen in:
- Verfasst von
- Rugero Anderson Vaz Bulzing
- Stuart Charles Miller
- Carlos Gomes Oliveira
- Erschienen in
- Sport Sciences for Health | Ausgabe 1/2024
Abstract
Purpose
This study measured bilateral deficit (BD) of torque and rate of torque development (RTD) of knee extensors during isometric and concentric tests performed on two isokinetic machines, one for each leg.
Methods
36 volunteers performed concentric (60°/s) and isometric repetitions, unilaterally and bilaterally. The BD was measured as BD index (BDI), calculated from the peak torque of concentric, and from the mean torque of the 0.5–2.0 s window of isometric. For isometric, RTD was measured over 50, 100, 150, 200, and 250 ms, and for concentric, as the maximal value of the derivate function of torque signal (mRTD).
Results
The isometric BDI values were evenly distributed about zero and not significantly different from zero (p = 0.751). The comparisons of all RTDs between unilateral and bilateral showed no difference between these conditions (the lower p value was 0.240). From concentric tests, the mean (SD) BDI was −4.5% (6.6), significantly less than zero (p < 0.001), and mRTD was lower during bilateral than unilateral left (p = 0.002) and right (p = 0.002) conditions. No correlation between BDI of isometric and concentric tests was found (r = 0.114, p = 0.506).
Conclusion
As isometric BDI was zero for torque and RTDs of bilateral showed not to be significantly different of unilateral, it is suggested that there is no BD during isometric test. As isometric and concentric BDI did not correlates, it is carefully suggested that isometric BDI may be accounted for intrinsic random error of measurement, while different mechanism may impact the BDI during non-stationary actions, and further studies with appropriate design should test such hypotheses.
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- Titel
- There is no bilateral deficit of torque and rate of torque development of knee extensors during isometric exertion when measured by two independent isokinetic machines
- Verfasst von
-
Rugero Anderson Vaz Bulzing
Stuart Charles Miller
Carlos Gomes Oliveira
- Publikationsdatum
- 25.06.2023
- Verlag
- Springer Milan
- Erschienen in
-
Sport Sciences for Health / Ausgabe 1/2024
Print ISSN: 1824-7490
Elektronische ISSN: 1825-1234 - DOI
- https://doi.org/10.1007/s11332-023-01088-2
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