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Related Experiment Video

Updated: Jan 30, 2026

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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Cluster Set Loading in the Back Squat: Kinetic and Kinematic Implications.

Alexander B Wetmore1, John P Wagle1, Matt L Sams2

  • 1Department of Sport, Exercise, Recreation, and Kinesiology, Center of Excellence for Sport Science and Coach Education, East Tennessee State University, Johnson City, Tennessee.

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Summary

Cluster loading, a resistance training method, enhances power output and velocity during back squats compared to traditional loading. This variation may offer superior benefits for athletes seeking to maximize force adaptation and performance.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Strength and Conditioning

Background:

  • Well-trained athletes require advanced training stimuli for continued adaptation.
  • Cluster loading, incorporating inter-repetition rest, is a potential method to increase training intensity and variation.

Purpose of the Study:

  • To investigate the kinetic and kinematic effects of cluster loading versus traditional loading in the back squat exercise.
  • To compare power output, velocity, and force production between the two loading strategies.

Main Methods:

  • Eleven resistance-trained men performed back squats at 80% of their one-repetition maximum under two conditions: traditional loading and cluster loading.
  • Kinetic and kinematic data were collected using force plates and linear position transducers at 1,000 Hz.
  • Cluster loading involved 30-second inter-repetition rests, while traditional loading had no inter-repetition rest.

Main Results:

  • Both loading methods yielded similar peak force, concentric average force, and eccentric average force.
  • Cluster loading demonstrated significantly higher peak power, peak velocity, and average velocity.
  • Cluster loading resulted in lower times to peak power and velocity, with better maintenance of these variables.

Conclusions:

  • Cluster loading may be a more effective strategy than traditional loading for enhancing power output and maintaining velocity during resistance training.
  • This method could provide a greater stimulus for adaptation in well-trained athletes.