A comparison of different voluntary isometric contractions forces on increasing muscle length
Item
- Title
- A comparison of different voluntary isometric contractions forces on increasing muscle length
- Author(s)
- Regis Camilla
- Abstract
-
AbstractMuscle Energy Techniques (MET) and Proprioceptive Neuromuscular Facilitation (PNF) are used in Osteopathic treatment to:
Increase joint range of motion associated with restricted mobility
Lengthen and relax short or taut hypertonic muscles
Lower the afferent drive thus breaking the pain-spasm cycle
Strengthening of physiologically weak muscles.
However, there are few clinical trials to establish the efficiency of these treatments. It is unclear as to the effects of various contraction forces on joint range of movement. The aim of the study is to investigate the effect on the range of movement of the knee joint at different voluntary isometric contractions on the hamstring muscle group. It was hypothesised that the stronger the voluntary isometric contraction force used during the contract-relax PNF/ MET the greater range of movement would occur.
Fifty asymptomatic subjects, twenty-five males and twenty-five females aged between 20 and 35 were recruited from the students at the British College of Osteopathic Medicine. The subjects were randomly selected into five groups. Each group of students were assigned different voluntary isometric contraction forces (100%, 50%, 20%, 10% or 0% MVIC) contract-relax PNF/ MET to the left hamstring muscle group. Measuring passive knee extension by a universal goniometer pre- and post intervention determined hamstring length.
Statistical analysis using both paired and unpaired t-tests concluded that all voluntary isometric contraction forces increased range of movement irrespective of the measurement effect (p< 0.0001). A one-way ANOVA test showed that the stronger the force of voluntary isometric contraction the greater the increase in range of movement was statistically accepted, however it also demonstrated that large differences in voluntary isometric contraction must be utilized.
It was suggested that the 50% voluntary isometric contraction is as effective as the 100% voluntary isometric contraction in increasing extension in the knee. This has clinical importance since all the voluntary isometric contraction forces significantly increase range of movement the results show that 100% voluntary isometric contraction is unnecessary to enhance the hamstring muscle group. Further investigation needs to be completed to find the optimum voluntary isometric contraction force for increasing muscle length. - presented at
- British College of Osteopathic Medicine
- Date Accepted
- 0
- Date Submitted
- 1.1.1970 00:00:00
- Type
- osteo_thesis
- Language
- English
- Submitted by:
- 62
- Pub-Identifier
- 13599
- Inst-Identifier
- 1076
- Recommended
- 0
- Item sets
- Thesis
Regis Camilla, “A comparison of different voluntary isometric contractions forces on increasing muscle length”, Osteopathic Research Web, accessed April 28, 2024, https://www.osteopathic-research.com/s/orw/item/1158