Comparative Analysis of the Efficacy of Standard and Rollga® Myofascial Rollers in Enhancing Trunk and Hamstring Flexibility

 The Rollga foam roller improves flexibility of standard rollers by 22%

Study Design: Randomized, Controlled, Feasibility Trial (N=50)
Author: Taggart D. Downare
Affiliation: Connect Health Institute, 1705 W St Germain St, St Cloud, MN, USA
Contact: Taggart D. Downare, Phone: (320) 761-3563, Email:

Keywords: Myofascial Release, Fascial Roller, Rollga, Foam Roller, Tissue Hydration, Muscular Stiffness, Fascia, Blood Flow Dynamics

Introduction: The utilization of Self Myofascial Release (SMR) techniques, particularly foam rolling, is increasingly recognized as a beneficial intervention in various clinical and athletic settings for injury prevention and rehabilitation. This study aims to evaluate and compare the efficacy of two distinct SMR tools: a conventional foam roller and the Rollga® Roller.

Muscle diagram of muscles massaged during the flexibility test assessment

Methods: A total of 50 participants (23 male, 27 female), free from current injuries, were randomly assigned to two groups (N=25 each). The study focused on SMR interventions targeting the mediolateral axis and the Sagittal Plane, with emphasis on the superficial fascia back line (SFB). Participants were subjected to a standardized foam rolling routine, using either a Standard Roller (SR) or the Rollga® Roller (RR). Each participant underwent both interventions in a crossover design within a 7-day interval. The protocol included rolling various body regions for specified durations, maintaining a consistent cadence. Flexibility and stiffness were quantitatively assessed pre- and post-intervention using the Modified Sit and Reach Box test, and statistical analysis was conducted using paired t-tests, Wilcoxon signed-rank tests, and Cohen’s d-test.

Flexibility and stiffness were quantitatively assessed pre- and post-intervention using the Modified Sit and Reach Box test

Results: Both tools demonstrated significant reductions in SFB stiffness and enhanced overall flexibility of the trunk and hamstrings (p<0.001). The Rollga® Roller group showed a notably higher percentage improvement in SFB flexibility compared to the foam roller group. Temperature increases in the treated areas were statistically similar for both tools, suggesting alternate mechanisms of action for the enhanced efficacy of the Rollga® Roller.

Conclusions: The application of both SMR tools resulted in notable improvements in flexibility, with the Rollga® Roller exhibiting superior efficacy. This suggests that the Rollga® Roller may engage additional mechanisms, potentially related to its unique design, contributing to greater improvements in trunk and hamstring flexibility. Future research should explore these mechanisms in greater depth, particularly in clinical populations.

Disclosures and Acknowledgments: This study received partial funding from Rollga® LLC, St Cloud, MN, USA.


  1. Myers, T. (2014). Anatomy Trains – Third Edition.
  2. NCBI Article
  3. Additional NCBI Reference
  4. Further NCBI Study

Figures: Depicting the use of the Rollga Roller on various body parts as outlined in the methodology, along with the Modified Sit and Reach Box setup.

Note: This revised version of the study abstract aims to maintain the original scientific integrity while enhancing the professional presentation of the research.

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