BullWorker - World's Best Home Gym Machine


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 isometric exercise.

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, Finland.

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

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.

The Best Way to Build Muscle in your Home.

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