The Effects of Eccentric Contraction Execution Time on the Properties of the Patellar Tendon

Fernando Martínez, Pablo Abián, Fernando Jiménez and Javier Abián-Vicén
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Fernando Martínez: Performance and Sport Rehabilitation Laboratory, Faculty of Sport Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain
Pablo Abián: Faculty of Humanities and Social Sciences, Comillas Pontifical University, 28049 Madrid, Spain
Fernando Jiménez: Performance and Sport Rehabilitation Laboratory, Faculty of Sport Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain
Javier Abián-Vicén: Performance and Sport Rehabilitation Laboratory, Faculty of Sport Sciences, University of Castilla-La Mancha, 45071 Toledo, Spain

IJERPH, 2022, vol. 19, issue 15, 1-12

Abstract: The purpose of this study was to assess the effects of eccentric contraction execution time on the morphological and elastic properties of the patellar tendon (PT) in a six-week, single-leg decline squat (SLDS) exercise training program. In addition, the effects of a six-week detraining period on the same variables were evaluated. Fifty participants were randomized into the control group (CG; n = 15), experimental group 1 (EG6s; n = 17; eccentric contraction execution time = 6 s) and experimental group 2 (EG3s; n = 18; eccentric contraction execution time = 3 s). The thickness and elastographic index (EI) in different regions of interest (ROIs) in the PT were measured after 6 weeks of eccentric training using the single-leg decline squat exercise (three sessions per week, 80% of the eccentric one-repetition maximum) and after 6 weeks of detraining. There was an increase in the thickness of the PT in the different ROIs analyzed in both experimental groups at the end of the training period. Especially worth noting was the increase in the thickness of the PT at the proximal level in EG3s ( p = 0.001), and the increase at the distal level in EG6s ( p = 0.001). On the other hand, there was a reduction in EI in EG6S at the end of the intervention program ( p = 0.021), and both experimental groups increased EI in the three regions of interest analyzed after the detraining period ( p < 0.01). In conclusion, the execution time of the eccentric contraction in the SLDS exercise determines the anatomical level of the morphological adaptations in the PT. These morphological adaptations are lost after 6 weeks of detraining, producing an increase in tendon stiffness.

Keywords: eccentric training; decline squat; patellar tendon; sonoelastography; stiffness (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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