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Having bigger, well-developed arms can significantly improve your overall appearance and attractiveness, making you look stronger and more muscular. However, many individuals struggle to add inches to their arms, particularly when it comes to the biceps and triceps. Despite their hard efforts, they often hit a plateau and feel frustrated. Fortunately, there’s an advanced technique backed by scientific research that can potentially help you break through that plateau and achieve greater arm growth. It's called accentuated eccentric loading or eccentric overload.
Before we delve into the details of accentuated eccentric loading, let's first understand the two types of isotonic contractions that occur during a repetition. The first is the concentric portion, also known as the lifting phase. This is when your muscle contracts and becomes shorter. For example, when you lift a dumbbell during a bicep curl, you're performing the concentric portion. The second part is the eccentric portion, or the lowering phase. This is when the target muscle lengthens, such as when you lower the dumbbell during a bicep curl. The eccentric portion seems to be more important for muscle growth compared to the concentric portion.
Evidence indicates that eccentric training plays an important and potentially additive role in resistance training–induced hypertrophy. When compared to concentric actions, lengthening actions have been shown to elicit more rapid elevations in muscle protein synthesis, greater increases in intracellular anabolic signaling and gene expression and preferential recruitment of Type II muscle fibers, which make up about 60% of the biceps and 65% of the triceps. Research indicates that eccentric training increases the addition of sarcomeres in series. Furthermore, a meta-analysis by Schoefeld & colleagues, analysed several studies comparing concentric and eccentric actions and found that eccentric actions resulted in a higher mean percent change in muscle growth compared to concentric actions.
To maximize the benefits of eccentric training, the concept of accentuated eccentric loading was introduced. This technique involves increasing the load only during the eccentric phase. It is based on the concept that the eccentric phase allows us to handle heavier weights of up to 50% greater than the concentric phase. By stressing your muscles with heavier loads during the eccentric phase, we trigger greater muscle damage and mechanical stress, creating more micro-tears in the muscle fibers, which then repair and grow back stronger and larger, resulting in improved muscle size and definition .
Several studies have explored the effectiveness of accentuated eccentric loading. For example, Friedmann and colleagues compared one group of subjects performing the traditional one-leg extension with another group performing leg extensions on a computer driven device using the same weight during the concentric phase but higher load during the eccentric phase. After 4 weeks, the group that used heavier loads during the eccentric phase experienced an average increase of 8% in type IIA fibres and a 5% increase in maximal strength while the traditional group experienced no difference.
Another study published in 2016 compared two groups performing leg press and leg extensions with one group using a 40% greater load during the eccentric phase compared to the concentric phase. The group applying accentuated eccentric loading experienced greater increases in work capacity, muscle activation, force production and muscle growth in the middle part of the quadriceps.
Furthermore, 3 other studies that implemented eccentric overload using flywheel devices found greater growth in the quadriceps muscles.
While the research on accentuated eccentric loading remains limited, Brad Schoenfeld, renowned scientist and researcher on muscle hypertrophy, states that eccentric overload is a promising technique for enhancing muscle growth. Despite its potential, many individuals steer clear of it due to the inconvenience of having to find a spotter and the fear of potential injuries.....
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