10/31/2022 0 Comments Incline dumbbell curl![]() ![]() These different protocols for dumbbell curl may impose different demands to the neuromuscular system, resulting in different solutions for the load sharing between elbow flexors. Incline Dumbbell Curl (IDC) and Dumbbell Preacher Curl (DPC) are two variations of the standard DBC, generally applied to optimize biceps brachii contribution for elbow flexion by fixing shoulder angle at a specific value. Although such relationship holds for isometric contractions, it can still be used to predict muscle force from joint angle during low velocity contractions. Moreover, the classic length-tension relationship is critical for muscle force production, especially during low velocity/high intensity exercises (Lieber, 2002). According to a biomechanical model for simulating Dumbbell Biceps Curl (DBC) exercise (Biscarini et al., 2005), the force produced by elbow flexors in quasi-static exercises increases with the load moment arm, which highly affects the direction and magnitude of joint internal forces. The weight of dumbbells or barbells is constantly oriented in a vertical direction, so that the load torque changes with joint angle and the peak of the load torque changes for different body positions (i.e. Incline dumbbell curl free#Many people are addicted to the benefits provided by training programs based on the use of free loads, from experienced athletes to children and elderly (Faigenbaum et al., 2003 Falk and Tenenbaum, 1996 Fleck and Kraemer, 1997). Furthermore, free load-based exercises mimics body movements in natural situations and elicits joint and segments stabilization (Cotterman et al., 2005). However, the use of free loads may be preferred in some occasions, since it does not constrain the movement and different exercises can be performed, eliciting the contribution of specific muscles (Cotterman et al., 2005). Equipments like dumbbells, barbells and cable machines are often used in conditioning and strengthening programs (Biscarini et al., 2005). Resistance training exercises are mostly applied to overload the musculoskeletal system, leading to the accelerated enhancement of muscle strength (Fleck and Kraemer, 1997). ![]() The Incline Dumbbell Curl and the classical Dumbbell Biceps Curl resulted in similar patterns of biceps brachii activation for the whole range of motion, whereas Dumbbell Preacher Curl elicited high muscle activation only for a short range of elbow joint angle. ![]() All exercises showed significant less muscle activity for the elbow extension (eccentric). The submaximal elbow flexion (concentric) elicited neuro muscular activity up to 95% of the maximum RMS value during the final phase of IDC and DBC and 80% for DPC at the beginning of the movement. Although all protocols elicited a considerable level of activation of the biceps brachii muscle (at least 50% of maximum RMS), the contribution of this muscle for elbow flexion/extension varied among exercises. The neuromuscular activity of biceps brachii long head was compared by further partitioning each contraction into three phases, according to individual elbow joint range of motion. A single cycle (concentric-eccentric) of DBC, IDC and DPC, was applied to 22 subjects using a submaximal load of 40% estimated from an isometric MVC test. The aim of this study is to identify changes in the neuromuscular activity of biceps brachii long head for IDC, DPC and DBC exercises, by taking into account the changes in load moment arm and muscle length elicited by each dumbbell curl protocol. Incline Dumbbell Curl (IDC) and Dumbbell Preacher Curl (DPC) are two variations of the standard Dumbbell Biceps Curl (DBC), generally applied to optimize biceps brachii contribution for elbow flexion by fixing shoulder at a specific angle. ![]()
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