Research and News
Research Updates
Evidence-based Recommendations for Core Training with Unstable Surfaces
Sep 2nd
Core training has maintained its popularity in fitness and rehabilitation despite controversies over optimal training methods for “core stability.” Training with unstable surfaces such as Thera-Band® exercise balls, stability trainers, and balance boards have been recommended for core training, suggesting that such surfaces promote activation of core muscles. The “core” can be defined as the axial skeletal and its muscular and fascial attachments, including the pelvic and shoulder girdle.
Recently, resistance training while balancing on unstable surfaces such as exercise balls has become popular. Canadian researchers David Behm PhD and colleagues published a comprehensive review and position stand on the use of instability to train the core. Research has shown that exercises performed on unstable surfaces produce higher levels of muscle activation in both the core and extremity muscles compared to stable surfaces. However, force and power outputs are decreased while exercising on unstable surfaces, sometimes up to 70%. Interestingly, increasing levels of core muscle activation can also be achieved with free weight exercises such as squats and Olympic lifts without added instability.
In their article, the authors made several recommendations for both athletes and non-athletic conditioning based on their review of the literature. Dr. Behm et al. noted that athletes should emphasize “higher-intensity ground-based lifts” (such More >
Balance exercises for chronic ankle sprains effective
Aug 31st
Chronic ankle sprains have been attributed to poor sensorimotor control, resulting in “functional ankle instability.” First described in the 1960’s by Freeman and Wyke, functional ankle instability has been postulated to result from a lack of proprioceptive information from the ankle due to “deafferentation.” Functional ankle instability is associated with chronic ankle sprains; patients with functional ankle instability may have normal strength and ligament structure, yet continue to suffer ankles sprains. Progressive balance exercise programs have been shown effective at reducing functional instability and recurring ankle sprains. Sensorimotor training programs for ankle instability often include balance exercises that use foam pads such as Thera-Band® Stability Trainers.
Researchers at the University of Kentucky developed a progressive balance training program for patients with chronic ankle instability. The program lasted 4 weeks and focused on dynamic balance stabilization in single-leg stance. Exercises included progressions in hops and single-leg balance using foam pads and 6-pound medicine balls. The results of their first study, published in Medicine and Science in Sports and Exercise in 2008, found that their program significantly improved function and postural control in chronic ankle sprain patients. In their more recent study, 29 subjects with chronic ankle instability were randomly assigned to either an exercise group or More >
FlexBar® study on Tennis Elbow published in JSES
Aug 26th
Tim Tyler’s study on the novel FlexBar® exercise for tennis elbow has been published in this month’s Journal of Shoulder and Elbow Surgery. Congratulations to Tim and his co-authors!
Their study using the “Tyler Twist” exercise for patients with tennis elbow showed significant improvements over tradition treatment. The study has been featured in the New York Times, Readers Digest and Consumer Health. Many patients have shared their success stories with us and interest continues to grow around the world!
Abduction exercise after hip replacement: is there an optimal progression?
Aug 23rd
Patients undergoing total hip replacement often have weak hip abductor muscles before and after surgery. One of the most common hip exercises is sidelying hip abduction using an ankle weight. While this may be an effective exercise to activate the gluteus medius muscle, open-chain, non-weight bearing hip abduction is not specific to the function of the gluteus medius as a pelvic stabilizer in single-leg stance. Resisted lateral walking with a Thera-Band® Band Loop or Tubing with Cuffs is an example of such a closed-chain exercise as the patient steps away from the involved leg.
Researchers at the University of Kentucky evaluated electromyographic (EMG) levels of 4 exercises in total hip patients between 7 and 32 weeks post-operative. Dr. Cale Jacobs and colleagues were interested to see if there was a progression of muscle activation to guide clinical decisions about hip abduction exercise prescription. They published their findings in the Journal of Arthroplasty. The 4 exercises included 2 non-weight bearing and 2 weight-bearing exercises:
- Standing hip abduction with cuff weight at 1% of bodyweight, lifted to 30 degrees
- Sidelying hip abduction with cuff weight at 0.5% of bodyweight, lifted to 50% of leg length
- Standing hip abduction with uninvolved leg to 30 degrees
- Lateral walk with Thera-Band resistance band attached with More >
Young women can gain as much strength using the Thera-Band® Exercise Station as training with free weights
Aug 18th
Dr. Juan Carlos Colado of the University of Valencia in Spain has published several excellent research papers on the effectiveness of Thera-Band® elastic resistance for fitness. In particular, he and his colleagues have shown that elastic resistance is as effective as isotonic machines for increasing strength in middle-aged women (Colado & Triplett 2008). In addition, they showed that elastic resistance exercise intensity can be regulated using “perceived exertion.”
Dr. Colado has continued his scientific investigations on the efficacy of elastic resistance, this time comparing free weight exercise training to elastic tubing exercises using the Thera-Band Exercise Station. His results are published in the International Journal of Sports Medicine. 42 women were randomly assigned to either a free weight exercise group, a Thera-Band exercise group, or a non-exercising control group. The two exercise groups performed the same 15 upper and lower body exercises using the OMNI perceived exertion scale to standardize intensity between the groups. The intervention lasted eight weeks for two to four sessions per week. Subjects were tested for muscular strength before and after the training program.
After the eight week program, both exercise groups reported up to 29% improvement in upper and lower body strength, while the control group did not. There was no More >
