PubMed · 11059469
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
D R Ankrum. 2000. On the confusion between static load level and static task.. https://doi.org/10.1016/s0003-6870(00)00021-1
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
We report the case of a 65-year-old man with a 15-year history of oculopharyngeal muscular dystrophy (OPMD) harboring a (GCG)11 mutation of the poly(A)-binding protein 2 (PABP2) gene. He developed, early in the course of the disease, a severe chronic axonal neuropathy. Although the primary myopathic origin of the disease appears to be established, a small number of cases of OPMD with neuropathic features have been described. This case raises the question of a possible neurogenic component to this disease and the role of the length of the mutation in phenotype severity.
BACKGROUND: A reduction in expiratory muscle (ExM) endurance in patients with chronic obstructive pulmonary disease (COPD) may have clinically relevant implications. This study was carried out to evaluate ExM endurance in patients with COPD. METHODS: Twenty three patients with COPD (FEV(1) 35 (14)% predicted) and 14 matched controls were studied. ExM endurance was assessed using a method based on the use of an expiratory threshold valve which includes two steps. In step 1 the load is progressively increased (50 g every 2 minutes) until task failure is reached, and the pressure generated against the highest tolerated load is defined as the maximal expiratory sustainable pressure (Pthmax). In step 2 subjects breathe against a submaximal constant load (80% of Pthmax) and the time elapsed until task failure is termed the expiratory endurance time (Tth(80)). In addition, the strength of peripheral muscles (handgrip, HGS) and respiratory muscles (maximal inspiratory and expiratory pressures, PImax and PEmax, respectively) was evaluated. RESULTS: Patients with COPD had lower ExM strength and endurance than controls: PEmax 64 (19)% predicted v 84 (14)% predicted (mean difference 20%; 95% confidence intervals (CI) 14 to 39); Pthmax 52 (27) v 151 (46) cm H(2)O (mean difference 99, 95% CI 74 to 123); and Tth(80) 9.4 (6.3) v 14.2 (7.4) min (mean difference 4.8, 95% CI 1.0 to 10.4; p<0.01 for all). Interestingly, ExM endurance directly correlated with both the severity of airways obstruction (Pthmax with FEV(1), r=0.794, p<0.01) and the reduction in strength observed in different muscle groups (Pthmax with HG, PImax or PEmax, r=0.550, p<0.05; r=0.583, p<0.001; and r=0.584, p<0.001, respectively). CONCLUSIONS: ExM endurance is decreased in patients with COPD. This impairment is proportional to the severity of the disease and is associated with lower strength in different muscle groups. This suggests that systemic effects are implicated in the impairment observed in ExM function.
Explore the source record for details and available documents.