The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals

Barakat, Christopher; Barroso, Renato; Alvarez, Michael R.; Rauch, Jacob; Miller, Nicholas; Bou-Sliman, Anton; Souza, Eduardo Oliveira de

doi:10.3390/sports7090204

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…To ensure that swelling in the muscles from training did not obscure MT results, images were obtained at least 48 h after exercise/training sessions both in the pre- and post-study assessment. This is consistent with research showing that acute increases in MT return to baseline within 48 h following a RT session ( Barakat et al, 2019 ; Ogasawara et al, 2012 ) and that muscle damage is minimal after repeated exposure to the same exercise stimulus over time ( Damas et al, 2016 ; Biazon et al, 2019 ). To further ensure accuracy of measurements, 3 successive images were obtained for each site and then averaged to obtain a final value.…”

Section: Methodssupporting

confidence: 90%

Gaining more from doing less? The effects of a one-week deload period during supervised resistance training on muscular adaptations

Coleman,

Burke,

Augustin

et al. 2024

PeerJ

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Background Based on emerging evidence that brief periods of cessation from resistance training (RT) may re-sensitize muscle to anabolic stimuli, we aimed to investigate the effects of a 1-week deload interval at the midpoint of a 9-week RT program on muscular adaptations in resistance-trained individuals. Methods Thirty-nine young men (n = 29) and women (n = 10) were randomly assigned to 1 of 2 experimental, parallel groups: An experimental group that abstained from RT for 1 week at the midpoint of a 9-week, high-volume RT program (DELOAD) or a traditional training group that performed the same RT program continuously over the study period (TRAD). The lower body routines were directly supervised by the research staff while upper body training was carried out in an unsupervised fashion. Muscle growth outcomes included assessments of muscle thickness along proximal, mid and distal regions of the middle and lateral quadriceps femoris as well as the mid-region of the triceps surae. Adaptions in lower body isometric and dynamic strength, local muscular endurance of the quadriceps, and lower body muscle power were also assessed. Results Results indicated no appreciable differences in increases of lower body muscle size, local endurance, and power between groups. Alternatively, TRAD showed greater improvements in both isometric and dynamic lower body strength compared to DELOAD. Additionally, TRAD showed some slight psychological benefits as assessed by the readiness to train questionnaire over DELOAD. Conclusion In conclusion, our findings suggest that a 1-week deload period at the midpoint of a 9-week RT program appears to negatively influence measures of lower body muscle strength but has no effect on lower body hypertrophy, power or local muscular endurance.

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Section: Methodssupporting

confidence: 90%

Gaining more from doing less? The effects of a one-week deload period during supervised resistance training on muscular adaptations

Coleman,

Burke,

Augustin

et al. 2024

PeerJ

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“…Unlike the N-VAR group, the VAR group showed significant MT increases of the proximal elbow flexors and the middle lateral thigh sites. These findings may be explained by the sum of some factors, including muscle morphology, the position of the joints involved in performing the exercises, and range of motion [8,14,22].…”

Section: Discussionmentioning

confidence: 99%

“…From a theoretical point of view, three possible reasons are proposed for explaining the non-homogeneous hypertrophy of a muscle: a) a difference in muscular activation the across muscle length [12], b) a variation in relative intensity on the muscle tissue during dynamic movement due to change in velocity and mechanical advantage [13], and c) a passive tension and active insufficiency of biarticular muscles [14]. Besides, given that different exercises lead to distinct stimuli along the muscle length [7][8][9][10], alternating or varying the choice of the exercises seems a good alternative to stimulate various muscle sites.…”

Section: Introductionmentioning

confidence: 99%

Does Performing Different Resistance Exercises for the Same Muscle Group Induce Non-homogeneous Hypertrophy?

et al. 2021

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The study aimed to compare the effect of performing the same or different exercises for a muscle group on resistance training (RT) sessions on muscle hypertrophy at different sites along muscle length. Twenty-two detrained men (23.3±4.1 years) were randomly allocated to the following groups: a group that performed the same exercises in all training sessions (N-VAR=11) or one that varied the exercises for the same muscle groups (VAR=11). All were submitted to 3 weekly sessions for nine weeks. Muscle thickness was assessed at the proximal, middle, and distal sites of the lateral and anterior thigh, elbow flexors, and extensors by B-mode ultrasound. The VAR group significantly increased all the sites analyzed (P<0.05). Furthermore, the proximal site of the lateral thigh showed a larger relative increase when compared to the middle site (P<0.05). In contrast, the N-VAR group were not revealed significant improvements only for the middle site of the lateral thigh and the proximal site of the elbow flexors (P>0.05). Our results suggest that to perform different resistance exercises can induce hypertrophy of all sites assessed in detrained young men.

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“…These include electromyography (EMG) [27] to assess muscle activation levels, muscle biopsies [28] to analyze changes in muscle fiber size and composition, ultrasound imaging [29] to measure muscle thickness and cross-sectional area, and strength testing [30] to evaluate changes in muscular strength and endurance. Additionally, some studies have utilized different variations of the dumbbell curl exercise, such as altering the resistance [31], range of motion [32], and grip type [33], to investigate the effects of these factors on BB muscle activation and hypertrophy. In general, these diverse methods provide a comprehensive understanding of the physiological [34] and biomechanical [35] responses of the BB muscle to dumbbell curls exercise.…”

Section: Introductionmentioning

confidence: 99%

Investigating the biomechanics of the biceps brachii muscle during dumbbell curl exercise: A comprehensive approach

ASADİ DERESHGİ

2023

European Mechanical Science

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Investigation of the mechanical behavior of the biceps brachii (BB) muscle at different dynamic forces is essential to improve training techniques, prevent sports injuries and optimize rehabilitation results. In previous studies, researchers studied mechanical changes during muscle contraction using various mathematical methods and simulation models. The models adopted by the majority of these studies assumed a constant value for muscle force. However, variable muscle force has different effects on muscle mechanics. In this study, an inverse dynamic simulation model was initially utilized to determine the dynamic muscle forces generated in the BB while performing the dumbbell curl exercise with 5 kg and 10 kg weights. Subsequently, the finite element method (FEM) was used to calculate the stress and strain changes experienced by BB as a consequence of the applied forces. Moreover, simultaneous analysis through electromyography (EMG) was carried out to investigate muscle contraction during the dumbbell curl exercise. Consequently, it was concluded that the average BB force during the dumbbell curl exercise with 5 kg and 10 kg weights was 433.9 N and 695.0 N, respectively. The maximum stresses in the BB during exercise were calculated to be 960.5 Pa and 1484.9 Pa, respectively. Additionally, the maximum displacements were determined to be 102.30 μm and 158.28 μm, respectively. According to the findings of muscle force 100% increase in dumbbell weight increases the maximum muscle force by 83.13% and the average muscle force by 60.17%. Therefore, it is understood that there was no linear correlation between weight gain and muscle force.

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The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals

Cited by 5 publications

References 36 publications

Gaining more from doing less? The effects of a one-week deload period during supervised resistance training on muscular adaptations

Gaining more from doing less? The effects of a one-week deload period during supervised resistance training on muscular adaptations

Does Performing Different Resistance Exercises for the Same Muscle Group Induce Non-homogeneous Hypertrophy?

Investigating the biomechanics of the biceps brachii muscle during dumbbell curl exercise: A comprehensive approach

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