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Titolo:
PERFORMANCE AND FIBER CHARACTERISTICS OF HUMAN SKELETAL-MUSCLE DURINGSHORT SPRINT TRAINING AND DETRAINING ON A CYCLE ERGOMETER
Autore:
LINOSSIER MT; DORMOIS D; GEYSSANT A; DENIS C;
Indirizzi:
CHU ST ETIENNE,PAVILLON 12 HOP ST JEAN BONNEFONDS F-42055 ST ETIENNE 02 FRANCE FAC MED ST ETIENNE,GIP EXERCISE,PHYSIOL LAB F-42023 ST ETIENNE 02 FRANCE
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 6, volume: 75, anno: 1997,
pagine: 491 - 498
SICI:
0301-5548(1997)75:6<491:PAFCOH>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
POWER OUTPUT; STRENGTH; FIBERS; ADAPTATIONS; INCREASE; MALES; WOMEN; WORK;
Keywords:
FORCE-VELOCITY TEST; MAXIMAL POWER; HUMAN MUSCLE FIBER; CYCLE ERGOMETER SPRINT TRAINING; DETRAINING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
M.T. Linossier et al., "PERFORMANCE AND FIBER CHARACTERISTICS OF HUMAN SKELETAL-MUSCLE DURINGSHORT SPRINT TRAINING AND DETRAINING ON A CYCLE ERGOMETER", European journal of applied physiology and occupational physiology, 75(6), 1997, pp. 491-498

Abstract

The ergometric effect of sprint training and detraining was studied in relation to muscle fibre changes in seven students trained during 9 weeks on a cycle ergometer. Before and after training and after 7-weekdetraining, they performed a force-velocity test on a friction-loadedcycle ergometer. On these three occasions, muscle samples were taken from vastus lateralis muscle at rest for histochemical analysis. The training-induced shift of the force-velocity relationship was such thatthe increase in maximal velocity (v(max)) was greatest against high braking forces (FB) With unchanged v(max) with no load. This was associated with higher maximal power output (28%) and peak force (16%). The increased maximal mean power output to reach a maximal velocity duringa short sprint was obtained against a 23% higher optimal F-B(F-B,(W) over bar max) At the same time, a considerable hypertrophy in fast twitch b (FTb) fibres was observed. All these changes were maintained after detraining. The training-induced changes in v(max) reached against F-B.(W over bar max)(v(m,(W) over bar max)) allowed us to produce evidence for two particular sub-groups in which inverse fibre conversions were observed. In subgroup A? the lowered post-training v(m (W) over bar max) was associated with a decrease in both FTa and FTb fibres. Conversely, the v(m,(W) over bar max) increase in subgroup B was associated with a higher percentage of FT fibres as the result of increased FTa fibres and decreased FTb fibres. Thus, the fibre hypertrophy associated with a unidirectional fibre translation [FTb --> FT2 --> slow twitch (ST)] toward fibres with a high thermodynamic efficiency would result mainly in increased force qualities, whereas the bidirectional fibre translation (ST --> FTa <-- FTb) would allow enhancement of both force and velocity properties.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 14:45:43