Front-Loading Fatigue: Does the Pre-exhaustion Method influence Resistance Training-induced Muscular Adaptations?

Area of Science:

• Exercise Physiology
• Sports Science
• Human Movement

Background:

• Optimizing resistance training (RT) protocols is crucial for maximizing adaptations in muscle hypertrophy, strength, and body composition.
• Pre-exhaust resistance training (PreEx) pairs single-joint exercises with multi-joint exercises, potentially altering training stimulus compared to traditional RT (TRAD).

Purpose of the Study:

• To compare the effects of PreEx versus TRAD on muscular hypertrophy, strength, body composition, and muscular endurance over an 8-week period.
• To determine which training method, PreEx or TRAD, is more effective for specific fitness outcomes in resistance-trained individuals.

Main Methods:

• Forty-eight resistance-trained participants were randomized into either a PreEx or TRAD group.
• Both groups followed a lower body RT program twice weekly for 8 weeks, performing 4 sets of 8-12 RM.
• Training protocols differed in exercise order: TRAD performed all sets of one exercise before moving to the next, while PreEx performed a single-joint exercise immediately before its corresponding multi-joint exercise.

Main Results:

• The TRAD group exhibited slightly greater improvements in muscle thickness and body composition, though statistical significance was uncertain.
• No significant differences were observed between groups in 1RM squat strength, local muscular endurance, or countermovement jump height.
• Both training methods yielded comparable results for strength, power, and muscular endurance.

Conclusions:

• Traditional resistance training (TRAD) may offer a slight advantage over pre-exhaust resistance training (PreEx) for optimizing muscle hypertrophy.
• Pre-exhaust resistance training (PreEx) is a viable alternative to traditional resistance training (TRAD) for enhancing strength, power, and muscular endurance.