Research and News
Exercise Balls
Exercise Ball Core Muscle Activation: Which exercises are best?
Jul 15th
Thera-Band® exercise balls are used by therapists and trainers around the world for therapy and fitness training. Despite its widespread use, the exercise ball has lacked in research to support its clinical application. Some studies have shown that abdominal exercises performed on exercise balls produce more muscle activation than the same exercise performed on a stable surface (Vera Garcia et al. 2000). In addition to traditional abdominal crunches, the exercise ball offers a variety of exercises aimed at activating the core muscles. With the variety of exercises being performed on exercise balls, more research is needed to prove or disprove the efficacy of specific exercises.
Roll Out
Physical therapy researchers quantified the electromyographic (EMG) activity of the abdominals, latissimus dorsi, lower back, and quadriceps muscles during eight “core” exercises on the exercise ball in 18 healthy subjects. They reported their findings in the Journal of Orthopedic and Sports Physical Therapy.
They found that the upper and lower rectus abdominus muscle were most activated during the roll-out (63% and 53% of maximum, respectively), and pike exercises (47% and 55%), while the internal and external obliques were most active during the pike (84% and 56% respectively) and skier exercises (73% and 47%). Not surprisingly, the lumbar paravertebral More >
Does the exercise ball enhance EMG activity during resistance training?
Jun 24th
When exercise balls became popular in the United States in the 1980s, it was thought that their instability promoted higher activation of the back and abdominal muscles for core stabilization. Several studies have shown that the exercise ball does increase muscle activation of the abdominal muscles compared to a stable surface.
As the exercise ball increased in popularity, trainers and therapists began performing traditional resistance training exercises such as the bench press with dumbbells on an exercise ball. Theoretically, the unstable surface would increase activation of both trunk and shoulder muscles. In addition to the increased risk of injuries associated with traditional resistance training on an exercise ball, researchers began to show that using an exercise ball for extremity exercises was not as effective as once thought.
Canadian researchers (Andersen & Behm 2002) were among the first to show that performing a chest press on an exercise ball significantly decreased force output by 60%. Interestingly, the muscle activation levels remained the same between surface types despite a decrease in force output, suggesting resistance training on an unstable surface may produce less efficient muscle contractions. Subsequently, other researchers (Marshall & Murphy 2006) reported an increase in EMG levels of the deltoid and abdominals More >
Why is force output decreased while sitting on an exercise ball? The core stability debate continues.
Jun 3rd
“Core Stability” has become a very popular term when discussing topics ranging from functional performance in athletes to rehabilitation for patients with low back pain. The exercise ball has long been used to promote core stability through specific exercises aimed at activating core muscles including the abdominals, low back, and pelvic stabilizers. The use of unstable surfaces such as a Thera-Band® exercise ball has been shown to increase muscle activity compared to a stable surface by providing additional challenge to postural stability. Researchers have shown, however, that exercises on an unstable surface reduce force output, suggesting that traditional resistance training exercises should not be performed on an unstable surface when the goal is to increase core activation. This lack of force output on unstable surfaces is thought to be related to a lack of core stability.
Researchers in New Zealand set out to determine if the loss in force output while performing an overhead press exercise on an exercise ball was related to core muscle endurance. They were interested in the ‘specificity vs. generality” of core stability; in other words, is core stability related to overall physical performance, or simply a measure of core muscle endurance?
30 resistance-trained, healthy young males participated in the study. More >
USA Bowling Partners with Thera-Band Academy
May 25th
The new home of USA Bowling, the Bowling International Training and Research Center located in Arlington, Texas, is now open and featuring Thera-Band® products. As a partner with the Thera-Band Academy, the United States Bowling Congress (USBC) will use Thera-Band products in many exercises designed to correct poor movement patterns and decrease the risk of repetitive stress injuries. Exercises will focus on scapular and core stabilization and mobilization of the ankles, hips, and thoracic spine. Nicholas Bohanan, MEd, ATC, CSCS, NSCA-CPT, an Exercise and Conditioning Specialist with the USBC, has developed an elastic-resisted shoulder exercise strength training program for bowlers using Thera-Band resistance bands.
The Bowling International Training and Research Center is in association with the United States Bowling Congress and is the only bowling training center recognized by the United States Olympic Committee. The 930 sq. ft. Athlete Performance Enhancement Center is located within the facility and will be the focal point of training for USA Bowling’s adult and junior national teams. Other bowling athletes who will utilize the facility include many collegiate and International teams.
Is resistance training on unstable surfaces effective?
May 6th
Instability training, or exercising while on unstable surfaces, has become both popular and controversial. Performing resistance training on unstable surfaces such as exercise balls, balance boards, stability disks, and foam pads has been shown to reduce force output, but increase activation of “core” muscles of the trunk (Behm and Anderson 2006). No studies, however, have directly compared training outcomes on stable and unstable surfaces.
In a paper published in the Journal of Strength and Conditioning Research, researchers performed a 7 week study of resistance training exercises in 2 groups: one using unstable surfaces and the other on stable surfaces. The researchers hypothesized that the instability resistance training group would demonstrate significantly greater gains in functional testing after the program.
Forty, college-aged, healthy untrained subjects volunteered for the study. Subjects performed squats and vertical jumps, as well as 3 machine-resisted upper body exercises: lat pull down, butterfly, and bench press. Both groups performed upper body exercises at 70% of 1RM. The stable surface training group performed squats at 75% 1RM, and the instability group performed squats at 50% 1RM while balancing on wobble boards, stability discs, or a BOSU ball. The instability group also performed 4 trunk stabilization exercises on an exercise ball. Subjects More >
