The FlowDyn™, developed by ACI Medical, LLC, is engineered for athletes looking to gain a competitive edge by training harder and more frequently. The FlowDyn accelerates an athlete’s recovery process by using rapid mechanical pulses to improve local circulation and create vascular shear stress. Use FlowDyn and get back to intense training or competition more quickly.

FlowDyn™ enhances muscular repair and vascular growth.

Mike Arkans

Mike Arkans, Director of the Sport Division at ACI Medical, on how the use of FlowDyn during recovery takes training and competition to a new level.

FlowDyn Benefits

  • Creates vascular shear stress
  • Promotes accelerated, more efficient recovery
  • Improves local circulation
  • Reduces post-exercise pain and swelling
  • Enhanced muscle repair and vascular growth means more effective training

FlowDyn Features

  • Pre-programmed/timed for optimal effects
  • Free knee joint in order to keep from restricting blood flow to the legs (encourages complete joint mobility and range-of-motion)
  • Applies rapid stimulating, mechanical pulses to the muscles. Shear stress caused by these rapid mechanical pulses has been shown to cause vasodilation at the microcirculatory level. That increases tissue blood flow and brings metabolic nutrients, removes waste products, and mobilizes growth factors and cells
  • Easy to use, one switch operation with no programming necessary
  • Automatically adapts to athlete’s limb size
  • Technology is patented and patent pending

Compare FlowDyn

  • Compared to pneumatic tube devices, which focus on reducing swelling with low pressure, slowly applied for long durations: FlowDyn creates shear stress with rapid mechanical stimuli (vasodilation, growth factors, etc.); targets muscle groups; does not restrict joint motion or blood flow.
  • Compared to electrical stimulation devices: FlowDyn is easier to apply and provides pleasant stimulation that more closely simulates manual sport massage techniques.
  • Compared to vibratory devices: FlowDyn is automated and operation is hands-free.


Tube Compression Devices

Originally a medical device designed to reverse ischemia and promote growth. Originally a medical device designed for Lymphedema.
Applies 120mmHg in 0.3 seconds or less. Applies 70mmHg max over the course of 1 minute.
Greatly improves local circulation similar of that to a light jog and mechanical vigorous massage. Does not increase over all blood flow; moves extra cellular fluid into the cardiovascular system.
Creates shear stress. Does not create shear stress.

What is Shear Stress?

The body senses shear stress in the endothelium (inner lining) of the blood vessels. Shear stress is the friction created by accelerated blood between the blood and endothelium. Unlike tube compression devices, use of the FlowDyn device generates shear stress. When your body senses this shear stress, or friction, beneficial biochemicals are released into the blood. With normal circulation of the blood throughout your body, the biochemical benefits become systemic. The following table describes some of the benefits of these biochemicals.


Biomarker Function

PGC1-a Induces mitochondrial biogenesis in cells. Mitochondrial Biogenesis is the process by which cells increase the number and mass of the mitochondria in the cell.
IL-6 Anti-inflammatory that is increased with duration of exercise and the amount of muscle mass being used.* The longer the FlowDyn is used, the more IL-6 is released.

Produces Nitric Oxide, which is used for vasodilation, which in turn, aids in the increase of overall blood flow.*

"Nitric oxide (N-O) is essential for efficient functioning of skeletal muscle. Acutely, it increases muscle blood flow thereby improving the delivery of oxygen and nutrients to the muscles while also effectively removing metabolic waste products. It increases the efficiency of ATP production and its utilization, thus improving exercise performance under different modes of exercise including resistance exercise. Moreover, it activates satellite cells that are involved in muscle tissue repair and growth, and can initiate protein synthesis via the mTOR signaling pathway. Chronically boosting N-O production has been found to increase mitochondrial biogenesis and muscle capillary density.”

– John L. Ivy, PhD, FACSM, FNAK. Nathan Bryan, PhD.

MCP-1 Recruits monocytes (stem cells/progenitor cells) to the sites of injury/muscular damage. Accelerates the repair of damaged tissues.*
VEGF VEGF creates new blood vessels after injury and muscle following exercise, improves capillary density and aids in the formation of new vessels (collateral circulation) to bypass blocked vessels.
* Byproduct of shear stress.

For more information on shear stress:
View Blood Shear Stress Calculation pdf
View Bernoulli Principle Calculation pdf

I'm ready to take my training to a new level!