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Evaluation of Muscle Mechanical Capacities Through the Two-Load Method: Optimization of the Load Selection.
J Strength Cond Res. 2018 May; 32(5):1245-1253.JS

Abstract

Pérez-Castilla, A, Jaric, S, Feriche, B, Padial, P, and García-Ramos, A. Evaluation of muscle mechanical capacities through the 2-load method: Optimization of the load selection. J Strength Cond Res 32(5): 1245-1253, 2018-Recent research has revealed that the force-velocity relationship obtained from the "2-load method" (i.e., functional movements tested against just 2 external loads) could be a feasible method for the selective assessment of muscle force, velocity, and power-producing capacities. The study investigated the reliability and concurrent validity of the outcomes of the 2-load method observed from (a) farther vs. closer data points (20-70% 1 repetition maximum [1RM], 30-60% 1RM, and 40-50% 1RM) and (b) force-biased (50-70% 1RM) vs. velocity-biased (20-40% 1RM) data points. Twenty-two men were tested on a ballistic bench press throw performed against 6 incremental loads ranging from 20 to 70% of the bench press 1RM. The 2-load methods were constructed based on pairs of individually selected external loads and compared with the outcome of the force-velocity regression method applied to all 6 loads. The reliability and validity of the force-velocity relationship parameters decreased with the proximity of the data points (40-50% 1RM < 30-60% 1RM < 20-70% 1RM). The velocity-biased and force-biased loads (i.e., lighter and heavier loads, respectively) revealed a similar but relatively moderate reliability and validity. Overall, the farthest pair of loads (i.e., 20% 1RM and 70% 1RM) revealed the highest reliability (CV = 5.5%, ICC = 0.89) and validity (r = 0.98) among all the 2-load methods evaluated. These results demonstrate that the 20-70% 1RM 2-load method could be a feasible approach for testing individual muscle mechanical capacities, whereas the observed outcomes could be most reliable and valid when obtained from the farthest pairs of applied loads.

Authors+Show Affiliations

Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.Department of Kinesiology and Applied Physiology and Biomechanics and Movement Science Graduate Program, University of Delaware, Newark, Delaware.Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.Department of Physical Education and Sport, Faculty of Sport Sciences, University of Granada, Granada, Spain.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28475551

Citation

Pérez-Castilla, Alejandro, et al. "Evaluation of Muscle Mechanical Capacities Through the Two-Load Method: Optimization of the Load Selection." Journal of Strength and Conditioning Research, vol. 32, no. 5, 2018, pp. 1245-1253.
Pérez-Castilla A, Jaric S, Feriche B, et al. Evaluation of Muscle Mechanical Capacities Through the Two-Load Method: Optimization of the Load Selection. J Strength Cond Res. 2018;32(5):1245-1253.
Pérez-Castilla, A., Jaric, S., Feriche, B., Padial, P., & García-Ramos, A. (2018). Evaluation of Muscle Mechanical Capacities Through the Two-Load Method: Optimization of the Load Selection. Journal of Strength and Conditioning Research, 32(5), 1245-1253. https://doi.org/10.1519/JSC.0000000000001969
Pérez-Castilla A, et al. Evaluation of Muscle Mechanical Capacities Through the Two-Load Method: Optimization of the Load Selection. J Strength Cond Res. 2018;32(5):1245-1253. PubMed PMID: 28475551.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of Muscle Mechanical Capacities Through the Two-Load Method: Optimization of the Load Selection. AU - Pérez-Castilla,Alejandro, AU - Jaric,Slobodan, AU - Feriche,Belén, AU - Padial,Paulino, AU - García-Ramos,Amador, PY - 2017/5/6/pubmed PY - 2018/9/5/medline PY - 2017/5/6/entrez SP - 1245 EP - 1253 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 32 IS - 5 N2 - Pérez-Castilla, A, Jaric, S, Feriche, B, Padial, P, and García-Ramos, A. Evaluation of muscle mechanical capacities through the 2-load method: Optimization of the load selection. J Strength Cond Res 32(5): 1245-1253, 2018-Recent research has revealed that the force-velocity relationship obtained from the "2-load method" (i.e., functional movements tested against just 2 external loads) could be a feasible method for the selective assessment of muscle force, velocity, and power-producing capacities. The study investigated the reliability and concurrent validity of the outcomes of the 2-load method observed from (a) farther vs. closer data points (20-70% 1 repetition maximum [1RM], 30-60% 1RM, and 40-50% 1RM) and (b) force-biased (50-70% 1RM) vs. velocity-biased (20-40% 1RM) data points. Twenty-two men were tested on a ballistic bench press throw performed against 6 incremental loads ranging from 20 to 70% of the bench press 1RM. The 2-load methods were constructed based on pairs of individually selected external loads and compared with the outcome of the force-velocity regression method applied to all 6 loads. The reliability and validity of the force-velocity relationship parameters decreased with the proximity of the data points (40-50% 1RM < 30-60% 1RM < 20-70% 1RM). The velocity-biased and force-biased loads (i.e., lighter and heavier loads, respectively) revealed a similar but relatively moderate reliability and validity. Overall, the farthest pair of loads (i.e., 20% 1RM and 70% 1RM) revealed the highest reliability (CV = 5.5%, ICC = 0.89) and validity (r = 0.98) among all the 2-load methods evaluated. These results demonstrate that the 20-70% 1RM 2-load method could be a feasible approach for testing individual muscle mechanical capacities, whereas the observed outcomes could be most reliable and valid when obtained from the farthest pairs of applied loads. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/28475551/Evaluation_of_Muscle_Mechanical_Capacities_Through_the_Two_Load_Method:_Optimization_of_the_Load_Selection_ L2 - https://doi.org/10.1519/JSC.0000000000001969 DB - PRIME DP - Unbound Medicine ER -