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Titolo:
GAS-EXCHANGE AND NEUROHUMORAL RESPONSE TO EXERCISE - INFLUENCE OF THEEXERCISE PROTOCOL
Autore:
GULLESTAD L; MYERS J; BJORNERHEIM R; BERG KJ; DJOSELAND O; HALL C; LUND K; KJEKSHUS J; SIMONSEN S;
Indirizzi:
VA HLTH CARE SYST,CARDIOL SECT,3801 MIRANDA AVE,111-C PALO ALTO CA 94304 UNIV HOSP,RIGSHOSP,DEPT MED B OSLO NORWAY UNIV HOSP,RIGSHOSP,INST SURG RES OSLO NORWAY STANFORD UNIV,DEPT VET AFFAIRS MED CTR STANFORD CA 94304
Titolo Testata:
Medicine and science in sports and exercise
fascicolo: 4, volume: 29, anno: 1997,
pagine: 496 - 502
SICI:
0195-9131(1997)29:4<496:GANRTE>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATRIAL-NATRIURETIC-FACTOR; CONGESTIVE HEART-FAILURE; ESSENTIAL-HYPERTENSION; PLASMA-CATECHOLAMINE; GROWTH-HORMONE; POLYPEPTIDE; SECRETION; FRAGMENT; PEPTIDE; HUMANS;
Keywords:
EXERCISE TESTING; MAXIMAL OXYGEN UPTAKE; CATECHOLAMINES; ATRIAL NATRIURETIC FACTOR; ENDOTHELIN; LACTATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
L. Gullestad et al., "GAS-EXCHANGE AND NEUROHUMORAL RESPONSE TO EXERCISE - INFLUENCE OF THEEXERCISE PROTOCOL", Medicine and science in sports and exercise, 29(4), 1997, pp. 496-502

Abstract

Maximal oxygen uptake varies with the exercise protocol, but the extent to which hormonal and metabolic responses to exercise are influenced by the exercise protocol has not been precisely defined. Twelve healthy subjects underwent maximal exercise testing using two incremental bicycle tests with individualized, identical work rate increments between 40 and 70 W. One protocol employed a 1-min and the other a 3-min duration per stage. Expiratory gas and venous blood were sampled at regular intervals for metabolic and hormonal analysis. Exercise duration for the 1-min and 3-min protocols was 6.0 +/- 0.1 and 14.3 +/- 0.3 min, respectively (P < 0.001). Significantly higher values were observed for peak VO2 and maximal ventilation during the 3-min protocol compared with the 1-min protocol (41.1 +/- 1.8 vs 38.3 +/- 1.6 ml.kg(-1).kg(-1).min(-1), P < 0.001; and 104.9 +/- 8.0 vs 97.2 + 5.7 l.min(-1), P < 0.05, for peak VO2 and peak ventilation, respectively). However, the maximal workload achieved was higher during the 1-min versus the 3-min protocol (300 + 24 vs 280 + 21 W, P < 0.01). No differences were observed for maximal heart rate or blood pressure, whereas maximal plasma lactate was roughly twice as high during the 3-min compared with the 1-min protocol (7.5 +/- 0.8 vs 3.8 +/- 0.5 mmol.l(-1), P < 0.001). Norepinephrine, epinephrine, dopamine, and growth hormone levels were generally higher throughout exercise during the 3-min compared with the 1-min protocol. When expressed as a percentage of peak VO2, however, differences in catecholamine levels were not observed. Endothelin levels did not change. We conclude that the exercise protocol profoundly influences exercise capacity as well as the metabolic and hormonal responseto exercise and should be considered when using these variables to evaluate an intervention.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 16:47:01