Improving Core Strength in the Warfighter With a Novel Device

Trunk control enables the body to stay upright while sitting and standing. Trunk muscles also respond to shifting weight during activity in order to keep the body balanced and to prevent falling over due to shifts in center-of-gravity. Trunk control is necessary to perform activities of daily living and to stave off low back pain to ensure servicemember optimal performance. Weakened trunk muscles are a symptom of conditions such as cerebral palsy and stroke as well as causing more common conditions such as low back pain (Karthikbabu; Emami). Military pilots with weak core muscles were associated with having significant low back pain (Yang). Chinese military recruits assigned to core muscle functional strength training intervention had half as many reports of low back pain as the control group and also reported increased lumbar endurance (Wang). After 9 weeks, military police officers given trunk training had significantly lower general musculoskeletal pain than control as well as increased trunk muscle endurance (Grani). A systematic review in 2021 concluded that core stability provides therapeutic effects in patients with nonspecific low back pain by reducing pain and disability and by improving quality of life measures (Frizziero).

AllCore360° is a novel core-strengthening machine intervention designed to target trunk muscles through gravity by means of high-intensity constant velocity rotating exercise (allcore360.com). AllCore360° is systematic, consistent and designed for use over time. The core is strengthened because a patient's core muscles are used in anterior, lateral, and posterior contractions sequentially during a single rotation (Palevo). The patient must resist gravity with the rotation as well as contract and fire isometrically to keep proper posture. Using proper posture, the patient must keep their back straight and neck neutral throughout the length of the intervention without relying on their lower body muscles at all (this is assisted by straps rendering the legs useless and by securing the pelvis in the chair). AllCore360° can be individualized so that the patient is sitting at a specific degree (0° to 90°), where lowering the degree increases the difficulty of keeping muscles activated to continuecorrect posture. Once secured to the machine, the patient spends a pre-specified number of minutes with their whole body spinning in a 360° arc at the pre-specified angle programmed into the machine, rotating clockwise, counter-clockwise, or both.

AllCore360° is a relatively new machine outside of high-performance sports and intense rehab, and as such there is little published literature evaluating it. Case reports do exist. One case report showed the impact a 14-week program of AllCore360° isometric trunk training had on a child with cerebral palsy, where upon completion the patient had improved trunk stability and motor function (Park). Another case series looked at the AllCore360°'s effect on trunk function, balance, and mobility after stroke, finding improved lateral control during standing and showing that an extended program of AllCore360° sessions is feasible and repeatable (Pilkar).