BullWorker Training - advanced isometric muscle
building and fitness.
The original Bullworker designed by Gert F
Kölbel in 1963 was a 2 sleeved telescopic metal cylinder device which was spring
loaded in the centre, with 2 plastic or rubber hand grips at the ends. In
addition 2 opposing cables are attached to the hand grips which was the
distinguishing feature of this as opposed to earlier devices. Exercises are
performed by pushing inwards on the handles or by pulling outwards on the
cables. The compression of the internal spring created the resistance giving
resistance levels often in excess of 200 pounds from a device which weighs
around 4 pounds.
Isometric Exercise for Rehabilitation
Isometric rehabilitation has become one of the
key tools used during modern stroke patients rehabilitation programs with great
effect. Additionally isometric or static exercises are often used in the early
part of injury rehabilitation as during isometric exercises, you contract your
muscles without movement. This maintains and builds muscle strength without
risking joint damage as you heal. Isometric rotator cuff exercises are common
rehabilitation exercises used for shoulder injuries.
How to Do Isometric Rotator Cuff Exercises
1.Stand sideways along a wall with your elbow at a 90-degree angle.
2.Place the outside of your forearm against the wall.
3.Press into the wall, contracting your muscles for 5 seconds, but don't move
your shoulder. Repeat five times.
4.Turn around and place the inside of your forearm against the wall; repeat the
Several studies have taken place regarding the
effectiveness of isometrics for rehabilitation:
Arch Phys Med Rehabil. 1994 Apr;75(4):465-9.
Clinical use of neck isometric strength measurement in rehabilitation.
Ylinen J, Ruuska J.
SourcePeurunka-Medical Rehabilitation and Physical Exercise Centre, Laukaa,
The purpose of this study was to evaluate for diagnostic purposes the isometric
strength of the neck flexor and extensor muscles in 56 patients with neck and
shoulder pain and to quantify the effect of a specific rehabilitation program.
An isometric measurement protocol was performed at the beginning and at the end
of a 3-week rehabilitation program that included physiotherapy, stretching,
aerobic exercises, and circuit training to improve arm, shoulder, and neck
muscle strength. In the beginning, mean neck flexor muscle isometric strength
was 83N (+/- 48 SD) and extensor muscle strength 158N (+/- 76 SD), whereas after
rehabilitation the strength measurements were 117N (+/- 43 SD) and 207N (+/- 84
SD) respectively. There was a significant increase in the ability to push
forward and backward, which correlated with the lessening of neck pain and
disability found at the end of the program (p < .05). Isometric strength
measurement is a useful and practical method of objectively showing a functional
improvement in response to rehabilitation
ISOMETRIC EXERCISE AND THE REHABILITATION OF THE MUSCLES OF THE LOWER LIMB
University of Western Australia K B Start
Petrofsky, J. S. (2001). Blood pressure and heart rate response to isometric
exercise: The effect of spinal cord injury in humans. European Journal of
Applied Physiology, 85, 592-595.
Injuries to the spinal cord can result in a variety of effects, including
decreased or lack of motor coordination and/or sensation below the level of
injury and a decreased or absent heart rate and blood pressure response to
exercise. The purpose of this study was to determine the effects of isometric
strength exercise on heart rate and blood pressure in paraplegics.
Participants - The study involved 164 subjects. Twenty-five controls with no
spinal cord injury were recruited, as well as 139 paraplegics, who were divided
into five groups based upon their level of injury: 24 subjects with complete
lesions at the T4 level, 29 with complete injuries at the T11-T12 level, 35
participants with complete L1-L3 injuries, 42 with incomplete lesions at the T4
level and 9 subjects with T4 Brown-Sequard paralysis.
Method - Strength was tested in all subjects via an isometric handgrip
dynamometer (tested in the dominant hand with three maximal efforts) and
isometric leg extension transducer (used on the right leg for three maximal
efforts). Here, the controls initiated their own right leg contractions, while
the paraplegics were subjected to electrically stimulated contractions. In
addition, hand and leg contractions were maintained at 40% intensity for 10
minutes after the initial maximal fatiguing effort. With the duration of every
fatiguing isometric contraction measured, heart rates were recorded at rest and
approximately every 15 seconds through electrocardiographic techniques. Blood
pressure was recorded through traditional manual auscultation at rest, about
every 20 seconds during the contraction and at 30 and 60 seconds
post-contraction. Finally, statistics were calculated using analysis of variance
and t-test analyses, with a level of significance of P < 0.05.
Results- For subjects with lumbar injuries, leg contractions could not be
generated due to denervation of the quadriceps muscle. During isometric
exercise, heart rate was shown to increase linearly during handgrip and leg
exercises in all subjects (except for complete L2 participants), with controls
exhibiting significantly higher heart rates toward the end of maximal leg
extension efforts as compared to the small increases in the electrically
stimulated subjects. Blood pressure also rose linearly in all groups during
handgrip exercises. However, blood pressure responses differed with regards to
leg exercises. Controls continued to exhibit linear increases with exercise, as
did subjects with any form of T4 injury. The lumbar and T12 subjects did not
show signs of any significant blood pressure changes from rest to exercise.
The Bullworker is perhaps the most advanced for
of isometric training device. With being expensive the Bullworker can enable
people with various injuries, ailments and medical conditions to enhance muscle
strength which in turns helps with the healing process. We are not aware of any
specific studies involving Bullworker training and rehabilitation however we
would be keen to assist with anyone who is engaged in this sort of research.
Please email us if we can assist.
The appliance of science to muscle growth and
fat loss - The BullWorker.
The Bullworker is the best selling isometric
home gym exerciser in the world. Originally called the Tensolator this German
designed device was manufactured and marketed from the UK. Over the last few
years considerable research into isometric based technology and specifically
Bull Worker or similar training devices has taken place in the UK where the
latest training protocols have been used to produce some incredible results in
terms of muscular growth and development.