Research and News
Posts tagged exercise ball
Stable vs. Unstable: Using Exercise Balls with the Overhead Press Exercise
Apr 29th
“Functional Training” has become increasingly popular in both rehabilitation and fitness. “Core training” has often been considered a component of functional training because of the transfer of force through the trunk to the extremities. Unstable surfaces such as Thera-Band® Exercise Balls and Stability Trainers are often used with traditional exercise movements to integrate training of the trunk and extremities.
Canadian researchers Anderson and Behm have shown that instability training can provide similar muscle activation levels at lower resistance levels compared to training on stable surfaces. Unfortunately, however, unstable surface training also results in a decrease force output of prime movers. California State University researchers set out to evaluate the electromyographic (EMG) activity of prime movers and core stabilizers during a seated overhead press exercise. 30 healthy, resistance-trained subjects performed an overhead press with dumbbells and barbells while sitting on a stable surface and on an exercise ball. The investigators were interested in looking for differences in EMG levels between the stable load (barbell) and unstable load (dumbbell), on both stable (bench) and unstable surfaces (exercise ball). Subjects used a 10RM resistance (maximum amount of weight lifted for 10 repetitions) for each of the 4 conditions; thus, each condition had a slightly different absolute load.
As expected, More >
Exercise ball more effective at activating abdominal muscles
Apr 8th
The exercise ball is a popular device for core training, and is often used to increase muscle activation, particularly of the abdominals. Most studies have concluded that the exercise ball increases electromyographic (EMG) activity of the abdominal muscles. In England, Dr. Michael Duncan investigated the muscle activation in 2 different parts of the rectus abdominus muscle (the upper and lower portions) during exercise both on and off an exercise ball. The 3 exercises were the abdominal curl-up, roll-out, and jack knife. Subjects also performed a curl-up on the floor.
The exercise ball consistently had significantly more rectus activation than the curl-up on the floor. The chart below provides the percent of maximal contraction (MVIC) of each portion of the abdominals during each exercise:
Floor Curl-up Ball Curl-up Jack knife Roll-out Upper Rectus 68% 84% 93% 104% Lower Rectus 64% 93% 111% 98%The study also found that the jack knife was the best exercise for lower abdominal activation compared to all other exercises. This may help clinicians choose an exercise that specifically targets one portion of the abdominals over another. However, some researchers suggest that isolating one muscle may not be beneficial for core stabilization, instead focusing on quick and strong activation of More >
Balance training effective at reducing falls and improving function
Apr 6th
Fall prevention exercise programs are becoming increasingly popular. Research has demonstrated the effectiveness of strength and balance exercises in reducing the risk of falls in older adults. National organizations such as the National Council on Aging (NCOA) and the Centers for Disease Control (CDC) recommend a multi-factoral approach to fall prevention because of the numerous risk factors. Approximately 1/3 of older adults sustain falls every year in the United States, costing over $19 billion in healthcare costs.
Physical therapist researchers at Cal State University Northridge performed a study to determine the effectiveness of a balance exercise training program on strength, balance, gait, and fall risk in 23 healthy community-dwelling older adults at risk for falls. Subjects were randomly assigned to an exercise group or non-exercising control group. The exercise group performed a small group-based balance program, “A Matter of Balance” for 12 weeks, three times a week in a class setting at the PT department.
According to the authors, the exercises included balance exercises standing on foam surfaces and balance boards, as well as squats with an exercise ball. Interestingly, there was no resistive strengthening component in their description of the exercise program, although the original “A Matter of Balance” program developed at Boston More >
Training program improves throwing accuracy in baseball players
Mar 31st
Core training is thought to be important to improve functional sport activities, particularly those involving force transfer through the abdominals and back, into the extremities. For example, much of the strength and power required to throw a baseball comes from the force transmitted through the core from the legs. This is an example of the ‘kinetic chain,” where different parts of the body are interconnected and all contribute in some way to performing a functional activity.
Few studies have investigated the effects of core training on functional performance. Athletic training researchers investigated the effects of a shoulder training program with and without core stability exercises. 19 baseball players were randomly assigned to an open and closed-chain exercise program, or the same program with additional core training. 15 healthy age-matched non athletes were used as a quasi-control group. Each subject was tested for throwing accuracy, core stability, and proprioception before and after the 6-week program.
Both groups performed a shoulder training program that included free weights, closed-chain balance board, step-up, and exercise ball exercises, as well as plyometric ball tosses. The core training group also performed stabilization exercises such as the dead bug, sit-up, bridge, wall slides, and sitting on an exercise ball.
After the training program, More >
Thera-Band® program helps improve lower extremity strength and biomechanics in female athletes
Feb 1st
Anterior cruciate ligament (ACL) tears occur in about one in every 3000 Americans; 80% of these injuries are non-contact, often requiring surgical reconstruction. Female athletes have a higher incidence of ACL injury, likely due to biomechanical differences compared to males. Research has focused on exercise programs that help improve these biomechanics in order to prevent ACL injuries. Dr. Dan Herman MD, PhD received a research award from Thera-Band Academy to investigate the effects of a strengthening program on jump-landing biomechanics of female athletes at the University of North Carolina. The protocol utilized Thera-Band® elastic bands and exercise balls.
Initially, Dr. Herman published a study concluding that while the protocol was effective at improving strength, the biomechanics of the athletes remained unchanged. He concluded that strengthening alone was not sufficient, and set out to find what needed to be combined with the training program. His subsequent study combined the Thera-Band strengthening protocol with video-assisted feedback, and he compared the combined intervention to a group receiving feedback only. Dr. Herman and his colleagues found that the group receiving both feedback and strengthening improved their biomechanics more than the feedback-only group. The paper won the 2008 O’Donoghue award from the American Orthopedic Society for Sports Medicine, given to the best More >
