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| Research Abstracts |
| Journal of Strength Conditioning Research |
2005 National Strength and Conditioning Association. |
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| Effects of Pelvic Stabilization on Lumbar Muscle Activivty During Dynamic Exercise. |
| JUN G. SAN JUAN, JAMES A. YAGGIE, SUSAN LEVY, VERT MOONEY, BRIAN UDERMANN, AND JOHN M. MAYER. |
Effects of pelvic stabilization on lumbar muscle activity during dynamic exercise. J. Strength Cond. Res. 19(4):000–000. 2005.—Many commonly utilized lowback exercise devices offer mechanisms to stabilize the pelvis
and to isolate the lumbar spine, but the value of these mechanisms remains unclear. The purpose of this study was to examine the effect of pelvic stabilization on the activity of the lumbar and hip extensor muscles during dynamic back extension exercise. Fifteen volunteers in good general health performed dynamic extension exercise in a seated upright position on a
lumbar extension machine with and without pelvic stabilization. During exercise, surface electromyographic activity of the lumbar multifidus and biceps femoris was recorded. The activity of the multifidus was 51% greater during the stabilized condition, whereas there was no difference in the activity of the biceps femoris between conditions. This study demonstrates that pelvic stabilization enhances lumbar muscle recruitment during dynamic exercise on machines. Exercise specialists can use these data when designing exercise programs to develop low back strength. |
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| SPECIFIC SPINAL EXERCISE Three Case Studies Using the MedX Lumbar Extension Machine. |
| Brian D. Johnson |
| The purpose of this research project was to ascertain the effects of specific exercise for the lumbar muscles, by way of the MedX Lumbar Extension Machine, and relative to previous years of exercise without such a machine. Three subjects improved lumbar strength significantly, and in one instance, became pain-free within two months although two years of previous chiropractic and physiotherapy proved ineffective. In two other instances, it became obvious that traditional exercise, including heavy deadlifts, squats and bent barbell rowing had no positive effect on maintaining or improving lumbar strength. |
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| Orthopedics |
18(10): 971-981; October 1995 |
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| BW Nelson, EJ O'Reilly, M. Miller, et. Al. |
76% of patients had good or excellent results.
Patients with either radicular or referred leg pain (over half of all patients) responded just as well as patients with isolated low back pain.
Prior to their evaluation, patients had seen on average three physicians and had failed six different treatment options including, for example, chiropractic, epidural injections, facet injections, ultrasound, traction, medication, and electrical stimulation.
Results were independent of diagnosis. Spinal fitness was crucial, regardless of underlying condition.
Patients completing the MedX program had dramatically less (68%) medical reutilization in the year after discharge than comparable control group patients treated with passive modalities. |
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| Spine |
24(9): 889-898. May 1999 |
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| Restorative Exercise for Clinical Low Back Pain |
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| S. Leggett, V. Mooney, L Matheson, BW Nelson, T Dreisinger, J VanZytveld, L Vie. |
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Separate clinics (California and Minnesota) using similar exercise-only protocols were able to achieve comparable excellent results with comparable patients.
Reutilization was dramatically reduced at both clinics to almost identical levels, thus validating the results of each. In the year after completion of treatment only 12% of patients at the clinic in Minnesota (Physicians Neck and Back Clinic) needed to re-enter the health care system for spinal problems. |
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| Medicine and Science in Sports and Exercise |
Vol. 28, No. 10, 1996 |
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| Effect of resistance training volume on strength and muscle thickness |
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| The purpose of this study was to determine the effects of different volumes of high-intensity resistance training on isometric torque and muscle thickness. Training was conducted three times per week using one set (low volume, EX-1, N = 18) or three sets (high volume, EX-3, N = 20) of dynamic variable resistance exercise. Ten subjects acted as nontraining controls (CONT). Bilateral knee extension (KEXT) and flexion (FLEX) exercise was performed to fatigue within 8-12 repetitions for 14 wk. Maximal isometric KEXT and KFLEX torque was tested at 6°, 24°, 42°, 60°, 78°, 96°, and 108° of KFLEX using a MedX (Ocala, FL) KEXT/KFLEX ergometer. |
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