This is the term for one of the rather strange and weird symptoms of Multiple Sclerosis which can be classed as one of the many invisible symptoms but also as a spasm-type symptom.
There are tiny muscles between each rib, called intercostal muscles which basically hold the ribs together, but also give the ribcage some flexibility; it's when these muscles go into spasm that we get the MS hug
Respiratory muscle function and exercise capacity in multiple sclerosis
K Foglio, E Clini, D Facchetti, M Vitacca, S Marangoni, M Bonomelli, and N Ambrosino
Patients with multiple sclerosis (MS) show a poor exercise tolerance. A reduction in respiratory muscle strength has also been reported. ... Respiratory muscle strength as assessed both by maximal inspiratory pressure (MIP) and maximal expiratory pressure (MEP) was significantly reduced (MIP 18-76 cmH2O; MEP 16-82 cmH2O) compared to predicted values...
RESPIRATORY INVOLVEMENT IN MULTIPLE SCLEROSIS
R. S. HOWARD1,2, C. M. WILES1,*, N. P. HIRSCH1, L. LOH1,*,*, G. T. SPENCER2 and J. NEWSOM-DAVIS1,*,*
Respiratory complications occur in advanced multiple sclerosis (MS) but may also complicate acute relapses earlier in the disease. ... Respiratory muscle weakness was a major factor in 14 patients (predominantly diaphragm involvement in six), bulbar weakness in seven patients, impaired voluntary control in three and impaired automatic control in three.
The effect of magnesium oral therapy on spasticity in a patient with multiple sclerosis
The effects of magnesium glycerophosphate oral therapy on spasticity was studied in a 35-year-old woman with severe spastic paraplegia resulting from multiple sclerosis (MS). We found a significant improvement in the spasticity after only 1 week from the onset of the treatment on the modified Ashworth scale, an improvement in the range of motion and in the measures of angles at resting position in lower limbs. No side-effects were reported and there was no weakness in the arms during the treatment.
and finally, unrelated to MS but very specific in terms of the muscle groups involved in spasm, and magnesium as a treatment option:
Tetanic convulsions--violent, painful paroxysms of muscle contractions superimposed on underlying rigidity--can occur spontaneously or in response to minor stimulation, such as nursing care or noise. These spasms can involve the laryngeal, intercostal, and diaphragmatic muscles, resulting in apnea.
Magnesium sulfate has emerged as an effective alternative to traditional sedatives in tetanus. Attygalle and Rodrigo, in two separate studies [25**, 26**, Class III], demonstrated the ability of intravenous (IV) magnesium sulfate to control spasms in severe tetanus with less sedation, minimized ventilatory support, and tolerance of enteral feeds.
oh yea and i just have to include this beauty again yikes
...The range of pathologies associated with Mg deficiency is staggering: hypertension (cardiovascular disease, kidney and liver damage, etc.), peroxynitrite damage (migraine, multiple sclerosis, glaucoma, Alzheimers disease, etc.), recurrent bacterial infection due to low levels of nitric oxide in the cavities (sinuses, vagina, middle ear, lungs, throat, etc.), fungal infections due to a depressed immune system, thiamine deactivation (low gastric acid, behavioral disorders, etc.), premenstrual syndrome, Ca deficiency (osteoporosis, hypertension, mood swings, etc.), tooth cavities, hearing loss, diabetes type II, cramps, muscle weakness, impotence (lack of NO), aggression (lack of NO), fibromas, K deficiency (arrhythmia, hypertension, some forms of cancer), Fe accumulation, etc. Finally, because there are so many variables involved in the Mg metabolism, evaluating the effect of Mg in many diseases has frustrated many researchers who have simply tried supplementation with Mg, without undertaking the task of ensuring its absorption and preventing excessive elimination, rendering the study of Mg deficiency much more difficult than for most other nutrients.