The Role of Contraction and Relaxation in Facial Sculpting
About the Authors
Bertica M. Rubio, M.D.
Medical Director, Antiaging Regenerative Medicine Clinic | Board-Certified Physician | Dartmouth Medical School
Dr. Bertica M. Rubio is a board-certified physician and Medical Director of the Antiaging Regenerative Medicine Clinic in Redlands, California. She earned her Bachelor of Science degree from Loyola Marymount University and her Doctor of Medicine from Dartmouth Medical School (Geisel School of Medicine). She completed her pediatrics residency at UC Irvine Medical Center.
With decades of clinical experience, Dr. Rubio specializes in age management medicine, regenerative medicine, wound healing, and growth factor therapies. Her practice integrates evidence-based medical science with advanced aesthetic and regenerative treatments, helping patients achieve optimal health and youthful vitality.
Dr. Rubio is passionate about educating patients on the science behind skincare, facial rejuvenation, and non-invasive technologies like EMS (Electrical Muscle Stimulation) for facial toning. Her articles for PureLift LAB combine rigorous medical knowledge with practical guidance for achieving real, lasting results.
Andrew Conrad Barile, PT, DPT
Doctorate of Physical Therapy (DPT), Licensed Physical Therapist (PT)
Dr. Andrew Conrad Barile is a Doctor of Physical Therapy and the CEO and Founder of Xtreem Pulse LLC. He earned his Doctorate in Physical Therapy from Daemen College and brings over two decades of clinical and entrepreneurial experience in pediatric physical therapy, craniosacral therapy, and medical device innovation. His deep understanding of human anatomy, muscle physiology, and therapeutic technology provides invaluable science-backed approach to facial rejuvenation and anti-aging solutions.
Daniel Grinberg, MD, FACS
Board-Certified Otolaryngologist & Head and Neck Surgeon | Fellow, American College of Surgeons | Assistant Clinical Professor, Mount Sinai School of Medicine
Daniel Grinberg, MD, FACS is a Board-Certified Otolaryngologist and Head & Neck Surgeon at ENT and Allergy Associates in West Nyack, NY. He earned his medical degree from Columbia University College of Physicians and Surgeons, completed his Otolaryngology residency at New York University Medical Center, and serves as Assistant Clinical Professor at Mount Sinai School of Medicine. He is a Fellow of both the American College of Surgeons and the American Academy of Otolaryngology.
Dr. Grinberg's head-and-neck surgical perspective brings PureLift LAB readers a wider clinical lens — connecting at-home EMS practice to the underlying medical anatomy with the same scientific rigor we apply to every device specification.
Prof. Dr. med. Ivo Buschmann
Chair of Angiology, Medizinische Hochschule Brandenburg | Clinic Director, University Clinic for Angiology, Brandenburg University Hospital | Former Senior Consultant, Charité Universitätsmedizin Berlin
Prof. Dr. med. Ivo Buschmann is Chair of Angiology at the Medizinische Hochschule Brandenburg Theodor Fontane (MHB) and Clinic Director of the University Clinic for Angiology at the Brandenburg University Hospital. He completed his medical training at the University of Hamburg, served as a Max-Planck Society Fellow at the Max-Planck-Institute for Heart and Lung Research, and held senior consultant positions at the Charité Universitätsmedizin Berlin Campus Virchow before being appointed Chair at MHB in 2016.
Prof. Buschmann is one of Europe's leading authorities on arteriogenesis — the flow-driven growth and remodeling of blood vessels — with more than 150 peer-reviewed publications and several US and EU patents on devices that stimulate collateral blood vessel growth through controlled shear-rate therapy. His research connects mechanical and electrical stimulation to vascular adaptation, microcirculation, and tissue perfusion.
Prof. Buschmann's contributions bring PureLift LAB readers a vascular-biology perspective that complements our existing clinical, physical-therapy, and surgical-anatomy authorship — explaining how EMS stimulation engages not only facial muscles but also the microcirculation that supplies them, and why smart delivery matters at the level of blood flow as much as muscle contraction.
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"Sculpting" describes a visual outcome — defined contours, lifted cheek apples, clear jawline angles. The mechanism underneath that visible outcome is what muscles do across time: contract, relax, repeat. Both phases matter. Both contribute to the sculpting result.
The short version
- Sculpting comes from cumulative contraction-relaxation cycling, not from constant contraction or constant relaxation.
- The contraction phase produces the immediate work; the relaxation phase enables fluid clearance and prepares the muscle for the next contraction.
- The cycling pattern itself supports microcirculation and lymphatic flow alongside the muscle activation.
- PureLift's randomized PDM delivers this cycling for the full 10-minute session.
What the contraction phase does
When a facial muscle contracts:
- It performs work — the actual physiological event that drives adaptation
- It compresses surrounding tissue, supporting fluid movement
- It engages the motor units recruited by the stimulus
- It consumes metabolic substrate (glucose, fatty acids) and produces metabolic byproducts (lactate, CO2)
Across weeks of consistent contractions, this work translates into the cumulative muscle adaptation that builds resting tone — the foundation of sculpted appearance.
What the relaxation phase does
If contraction is the work, relaxation is the reset that makes more work possible. During the relaxation phase:
- Muscle fibers return to their resting state, allowing the next contraction to be productive
- Surrounding tissue decompresses, supporting venous and lymphatic return
- Metabolic byproducts can be cleared from the muscle
- Calcium handling resets for the next activation
Without adequate relaxation between contractions, the muscle can't keep producing useful contractions. The cycling structure isn't optional — it's the only way to make repeated contractions sustainable across a session.
Why constant stimulation underperforms cycled stimulation
Older EMS protocols sometimes used constant or near-constant stimulation, which forced the muscle into prolonged contraction without adequate relaxation. The consequences were rapid fatigue, reduced effective work, and a less productive session.
Modern EMS — including PureLift's randomized PDM — explicitly builds the cycling structure in. Contractions are followed by relaxations; the pattern is randomized to prevent the neuromuscular adaptation that flat-pattern stimulation accelerates; the result is a session that keeps working effectively across the full duration.
What the published evidence supports
Downey et al. (2011) documented that varied-frequency stimulation produces longer effective muscle performance than constant-frequency stimulation — direct evidence for the cycling-structure benefit. Binder-Macleod and colleagues across multiple papers documented the role of pattern variation in fatigue resistance during stimulated contractions.
For the facial application specifically, Kavanagh et al. (2012) and Omatsu et al. (2024) demonstrated that consistent cycled facial NMES produces the cosmetic-outcome improvements (muscle thickness, cheek volume, jawline angle, skin elasticity) that map to the sculpted-look outcome.
The honest framing
Sculpting takes weeks. The contraction-relaxation cycling that supports it is what PureLift delivers in each 10-minute session, but the visible sculpting effect develops cumulatively rather than overnight. Each session is one cycle of the longer process.
The bottom line
Sculpting depends on cycling — contraction and relaxation in rhythmic alternation. PureLift's randomized PDM provides that cycling for the full session, supporting both the immediate fluid-movement effect and the cumulative tone-building effect that produces visible sculpted contours over weeks.
For the full cycling mechanism, see The Contraction-Relaxation Cycle.
References: Downey RJ et al. (2011), Muscle & Nerve 44(3):382-387, PMID 21996798. Kavanagh S et al. (2012), J Cosmet Dermatol 11(4):261-266, PMID 23174048. Omatsu J et al. (2024), J Cosmet Dermatol 23(10):3222-3233, PMID 38992992.