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Titolo:
THE EFFECTS OF DETRAINING ON POWER ATHLETES
Autore:
HORTOBAGYI T; HOUMARD JA; STEVENSON JR; FRASER DD; JOHNS RA; ISRAEL RG;
Indirizzi:
E CAROLINA UNIV,HUMAN PERFORMANCE LAB GREENVILLE NC 27858 EASTERN CAROLINA INTERNAL MED POLLOCKSVILLE NC 28573 NE MISSOURI STATE UNIV KIRKSVILLE MO 63501 E CAROLINA UNIV,BIOMECH LABS GREENVILLE NC 27858
Titolo Testata:
Medicine and science in sports and exercise
fascicolo: 8, volume: 25, anno: 1993,
pagine: 929 - 935
SICI:
0195-9131(1993)25:8<929:TEODOP>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
SKELETAL-MUSCLE ADAPTATIONS; STRENGTH; EXERCISE;
Keywords:
EXERCISE; SKELETAL MUSCLE; NEUROMUSCULAR; HORMONES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
T. Hortobagyi et al., "THE EFFECTS OF DETRAINING ON POWER ATHLETES", Medicine and science in sports and exercise, 25(8), 1993, pp. 929-935

Abstract

We investigated the effects of 14 d of resistive exercise detraining on 12 power athletes. In comparing performances pre- to post-detraining, there were no significant (P > 0.05) changes in free weight bench press (-1.7%), parallel squat (-0.9%), isometric (-7 %) and isokinetic concentric knee extension force (-2.3%), and vertical jumping (1.2%). In contrast, isokinetic eccentric knee extension force decreased in every subject (-12%, P < 0.05). Post-detraining, the changes in surface EMG activity of the vastus lateralis during isometric, and isokinetic eccentric and concentric knee extension were -8.4%, -10.1%, and -12.7 %, respectively (all P > 0.05). No significant changes occurred in knee flexion forces or EMGs (P > 0.05). Percentages of muscle fiber typesand the Type I fiber area remained unchanged, but Type II fiber area decreased significantly by -6.4% (P < 0.05). Levels of plasma growth hormone (58.3%), testosterone (19.2%), and the testosterone to cortisolratio (67.6%) increased, whereas plasma cortisol (-21.5%) and creatine kinase enzyme levels (-82.3%) decreased (all P < 0.05). Short-term resistive exercise detraining may thus specifically affect eccentric strength or the size of the Type II muscle fibers, leaving other aspectsof neuromuscular performance uninfluenced. Changes in the hormonal milieu during detraining may be conducive to an enhanced anabolic process, but such changes may not materialize at the tissue level in the absence of the overload training stimulus.

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Documento generato il 27/11/20 alle ore 01:55:47