Isometric Force Production Is Not Affected By Shoulder Abduction Position During Chest Press in Recreationally Trained Men

Authors

Colin J. Stas, California State University, NorthridgeFollow
Paulo H. Marchetti, California State University, NorthridgeFollow

Abstract

PURPOSE: The purpose of this study was to evaluate the effect of two different shoulder abduction positions on maximal force production during the isometric bench press exercise in recreationally trained men. METHODS: Twenty participants (25 ± 4.2 years, 178.6 ± 8 cm, 83.9 ± 12.8 kg) performed the maximal isometric bench press exercise at 60° and 90° of shoulder abduction. Participants were seated on a vertical bench press machine with a neutral grip and 90° of elbow flexion. Grip width was standardized at 2x the biacromial distance. Each participant was randomly assigned to one of two experimental conditions: (1) maximal isometric action at 90° of shoulder abduction or (2) maximal isometric action at 60° of shoulder abduction. Participants performed three maximal isometric actions, each lasting 3 seconds, with 10 seconds of rest between trials, in the assigned shoulder position. After completion of the first experimental condition, a 30-minute recovery period was provided, followed by the second experimental condition. Force production was measured using a load cell attached to the bench press machine, and the peak force (PF) from each experimental condition was used for further analysis. A paired t-test was conducted to compare PF between experimental conditions. RESULTS: No statistically significant difference was observed in PF between the 60° and 90° shoulder abduction positions (p > 0.05). CONCLUSION: Shoulder abduction position (60° vs. 90°) does not influence maximal force production during the isometric bench press exercise in recreationally trained men.

Recommended Citation

Stas, Colin J. and Marchetti, Paulo H. (2025) "Isometric Force Production Is Not Affected By Shoulder Abduction Position During Chest Press in Recreationally Trained Men," International Journal of Exercise Science: Conference Proceedings: Vol. 14: Iss. 5, Article 52.
Available at: https://digitalcommons.wku.edu/ijesab/vol14/iss5/52