TY  - JOUR
AU  - Kojić, Filip
AU  - Ranisavljev, Igor
AU  - Ćosić, Dušan
AU  - Popović, Dejana
AU  - Stojiljković, Stanimir
AU  - Ilić, Vladimir
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3945
AB  - The aim of the study was to compare the effects of two different training protocols, which differ in the duration of the eccentric phase, on the one-repetition maximum (1RM), thickness and contractile properties of elbow flexors. Twenty untrained college students were randomly divided into two experimental groups, based on the training tempo: FEG (Faster Eccentric Group: 1/0/1/0) and SEG (Slower Eccentric Group: 4/0/1/0). Training intervention was a biceps bending exercise, conducted twice a week for 7 weeks. The intensity (60–70% RM), sets (3–4) and rest intervals (120 s) were held constant, while repetitions were performed until it was not possible to maintain a set duration. In the initial and final measurements, 1RM, muscle thickness and tensiomyography parameters – contraction time (Tc) and radial deformation (Dm) – were evaluated. An ANCOVA model (using baseline outcomes as covariates) was applied to determine between-group differences at post-test, while Pearson’s product-moment correlation coefficient was used to investigate the relationship between absolute changes in muscle thickness and Dm. Muscle strength increase was greater for SEG than for FEG (6.0 ± 1.76 vs. 3.30 ± 2.26 kg, p < 0.01). In both groups muscle thickness increased equally (FEG: 3.24 ± 2.01 vs. SEG: 3.57 ± 1.17 mm, p < 0.01), while an overall reduction in Dm was observed (FEG: 1.99 ± 1.20 vs. SEG: 2.26 ± 1.03 mm, p < 0.01). Values of Tc remained unchanged. A significant negative relationship was observed between changes in muscle thickness and Dm (r = -0.763, Adj.R² = 0.560, p < 0.01). These results indicate that the duration of the eccentric phase has no effect on muscle hypertrophy in untrained subjects, but that slower eccentric movement significantly increases 1RM.
PB  - Institute of Sport
T2  - Biology of Sport
T1  - Effects of resistance training on hypertrophy, strength and tensiomyography parameters of elbow flexors: Role of eccentric phase duration
VL  - 38
IS  - 4
SP  - 587
EP  - 594
DO  - 10.5114/biolsport.2021.99323
ER  - 

@article{
author = "Kojić, Filip and Ranisavljev, Igor and Ćosić, Dušan and Popović, Dejana and Stojiljković, Stanimir and Ilić, Vladimir",
year = "2021",
abstract = "The aim of the study was to compare the effects of two different training protocols, which differ in the duration of the eccentric phase, on the one-repetition maximum (1RM), thickness and contractile properties of elbow flexors. Twenty untrained college students were randomly divided into two experimental groups, based on the training tempo: FEG (Faster Eccentric Group: 1/0/1/0) and SEG (Slower Eccentric Group: 4/0/1/0). Training intervention was a biceps bending exercise, conducted twice a week for 7 weeks. The intensity (60–70% RM), sets (3–4) and rest intervals (120 s) were held constant, while repetitions were performed until it was not possible to maintain a set duration. In the initial and final measurements, 1RM, muscle thickness and tensiomyography parameters – contraction time (Tc) and radial deformation (Dm) – were evaluated. An ANCOVA model (using baseline outcomes as covariates) was applied to determine between-group differences at post-test, while Pearson’s product-moment correlation coefficient was used to investigate the relationship between absolute changes in muscle thickness and Dm. Muscle strength increase was greater for SEG than for FEG (6.0 ± 1.76 vs. 3.30 ± 2.26 kg, p < 0.01). In both groups muscle thickness increased equally (FEG: 3.24 ± 2.01 vs. SEG: 3.57 ± 1.17 mm, p < 0.01), while an overall reduction in Dm was observed (FEG: 1.99 ± 1.20 vs. SEG: 2.26 ± 1.03 mm, p < 0.01). Values of Tc remained unchanged. A significant negative relationship was observed between changes in muscle thickness and Dm (r = -0.763, Adj.R² = 0.560, p < 0.01). These results indicate that the duration of the eccentric phase has no effect on muscle hypertrophy in untrained subjects, but that slower eccentric movement significantly increases 1RM.",
publisher = "Institute of Sport",
journal = "Biology of Sport",
title = "Effects of resistance training on hypertrophy, strength and tensiomyography parameters of elbow flexors: Role of eccentric phase duration",
volume = "38",
number = "4",
pages = "587-594",
doi = "10.5114/biolsport.2021.99323"
}

Kojić, F., Ranisavljev, I., Ćosić, D., Popović, D., Stojiljković, S.,& Ilić, V.. (2021). Effects of resistance training on hypertrophy, strength and tensiomyography parameters of elbow flexors: Role of eccentric phase duration. in Biology of Sport
Institute of Sport., 38(4), 587-594.
https://doi.org/10.5114/biolsport.2021.99323

Kojić F, Ranisavljev I, Ćosić D, Popović D, Stojiljković S, Ilić V. Effects of resistance training on hypertrophy, strength and tensiomyography parameters of elbow flexors: Role of eccentric phase duration. in Biology of Sport. 2021;38(4):587-594.
doi:10.5114/biolsport.2021.99323 .

Kojić, Filip, Ranisavljev, Igor, Ćosić, Dušan, Popović, Dejana, Stojiljković, Stanimir, Ilić, Vladimir, "Effects of resistance training on hypertrophy, strength and tensiomyography parameters of elbow flexors: Role of eccentric phase duration" in Biology of Sport, 38, no. 4 (2021):587-594,
https://doi.org/10.5114/biolsport.2021.99323 . .