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Titolo:
Target dyspnea ratings predict expected oxygen consumption as well as target heart rate values
Autore:
Mejia, R; Ward, J; Lentine, T; Mahler, DA;
Indirizzi:
Dartmouth Med Sch, Dept Med, Pulm & Crit Care Med Sect, Lebanon, NH USA Dartmouth Med Sch Lebanon NH USA m & Crit Care Med Sect, Lebanon, NH USA Natl Inst Resp Dis, Mexico City, DF, Mexico Natl Inst Resp Dis Mexico City DF Mexico sp Dis, Mexico City, DF, Mexico
Titolo Testata:
AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE
fascicolo: 5, volume: 159, anno: 1999,
pagine: 1485 - 1489
SICI:
1073-449X(199905)159:5<1485:TDRPEO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRESCRIBING EXERCISE INTENSITY; PERCEIVED EXERTION; COPD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Mahler, DA Dartmouth Hitchcock Med Ctr, 3-D,1 Med Ctr Dr, Lebanon, NH 03756 USA Dartmouth Hitchcock Med Ctr 3-D,1 Med Ctr Dr Lebanon NH USA 03756
Citazione:
R. Mejia et al., "Target dyspnea ratings predict expected oxygen consumption as well as target heart rate values", AM J R CRIT, 159(5), 1999, pp. 1485-1489

Abstract

A target heart rate (THR) is the traditional method to prescribe and monitor exercise training intensity in healthy individuals. However, patients with chronic obstructive pulmonary disease (COPD) are limited by ventilatory impairment and dyspnea rather than cardiovascular factors. An alternative approach is to use dyspnea ratings as a target for exercise training in patients with respiratory disease just as ratings of perceived exertion have been used in healthy individuals. The study was a randomized, parallel group trial comparing the ability of patients with COPD to accurately and reliably produce an exercise intensity using a target dyspnea rating (TDR) versus a THR, At Visit 1 patients performed an incremental exercise test on the cycle ergometer, and target values were calculated at similar to 75% of maximal oxygen consumption ((V) over dot o(2)) At Visits 2 (3 to 5 d later) and 3 (2 wk later) each patient was instructed to produce a TDR or a THR for 10min of submaximal exertion. Anthropometric characteristics, lung function,and exercise performance were similar for the 22 patients in each group atVisit 1, For the TDR group the dyspnea target was 2.5 +/- 1.5 at an expected (V) over dot o(2) of 0.88 +/- 0.28 L/min; for the THR group the heart rate (HR) target was 114 +/- 15 beats/min at an expected (V) over dot o(2), of 0.76 +/- 0.29 L/min (p = 0.18 for (V) over dot o(2) between groups). Compared with the expected (V) over dot o(2) from Visit 1, the individual percent differences in (V) over dot o(2) at Visit 2 were -3.9 +/- 18.1% (TDR) and -0.5 +/- 23.2% (THR) (p = 0.58); at Visit 3 the individual percent differences in (V) over dot o(2) were -2.3 +/- 17.0% (TDR) and 2.6 +/- 30.6% (THR) (p = 0.52). The number of patients < 10% and greater than or equal to 10%of the expected (V) over dot o(2) were similar for the two groups at Visits 2 (p = 0.38) and 3 (p = 0.27). There were no significant differences for (V) over dot o(2), values (absolute or individual percent) at Visits 2 and 3 for each group and between the groups (p = 0.79). In conclusion, patientswith symptomatic COPD demonstrated a comparable ability to use dyspnea ratings and HR as a target to accurately and reliably produce an expected exercise intensity (similar to 75% Of (V) over dot o(2)max) for 10 min of submaximal exertion.

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Documento generato il 05/07/20 alle ore 23:04:56