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Titolo:
SKELETAL-MUSCLE ADAPTATIONS TO PROLONGED TRAINING, OVERTRAINING AND DETRAINING IN HORSES
Autore:
TYLER CM; GOLLAND LC; EVANS DL; HODGSON DR; ROSE RJ;
Indirizzi:
UNIV SYDNEY,RURAL VET CTR,EQUINE PERFORMANCE LAB,PMB 4,WEROMBI RD CAMDEN NSW 2570 AUSTRALIA UNIV SYDNEY,RURAL VET CTR,EQUINE PERFORMANCE LAB CAMDEN NSW 2570 AUSTRALIA UNIV SYDNEY,DEPT ANIM SCI,RURAL VET CTR CAMDEN NSW 2570 AUSTRALIA
Titolo Testata:
Pflugers Archiv
fascicolo: 3, volume: 436, anno: 1998,
pagine: 391 - 397
SICI:
0031-6768(1998)436:3<391:SATPTO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAXIMAL OXYGEN-UPTAKE; EXERCISE; MORPHOLOGY; CAPACITY;
Keywords:
SKELETAL MUSCLE; MITOCHONDRIA; FIBER AREA; FIBER TYPE; CAPILLARY; TRAINING; OVERTRAINING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
C.M. Tyler et al., "SKELETAL-MUSCLE ADAPTATIONS TO PROLONGED TRAINING, OVERTRAINING AND DETRAINING IN HORSES", Pflugers Archiv, 436(3), 1998, pp. 391-397

Abstract

Thirteen standard-bred horses were trained intensively for 34 weeks and detrained for 6 weeks to study skeletal muscle adaptations to prolonged training, overtraining and detraining, Training included endurance (phase 1, 7 weeks), high-intensity (phase 2, 9 weeks) and overload training (OLT) (phase 3, 18 weeks). During phase 3, horses were dividedinto two groups, OLT and control (C), with OLT horses performing greater intensities and durations of exercise than C horses. Overtraining was evident in OLT horses after week 31 and was defined as a significant reduction in treadmill run time in response to a standardised exercise test (P<0.05). Relationships between peripheral (skeletal muscle) and whole body (maximum O-2 uptake, (V) over dot O-2,O- max, treadmillrun time) adaptations to training were determined. Prolonged trainingresulted in significant adaptations in morphological characteristics of skeletal muscle but the adaptations were limited and largely completed by 16 weeks of training. Fibre area increased in all fibres while the number of capillaries per fibre increased and the diffusional index (area per capillary) decreased. Mitochondrial volume density continued to increase throughout 34 weeks of training and paralleled increases in (V) over dot O-2,O-max and treadmill run time. Significant correlations were noted between mitochondrial volume and (V) over dot O-2,O-max (R=0.71), run time and (V) over dot O-2,O- max (R=0.83) and mitochondrial volume and run time (R=0.57). We conclude that many of adaptive responses of muscle fibre area and capillarity occur in the initialtraining period but that markers of oxidative capacity of muscle indicate progressive increases in aerobic capacity with increases in training load. The lack of differences between C and OLT groups indicated that there may be an upper limit to the ability of training stimulus toevoke skeletal muscle adaptive responses. There was no effect of overtraining or detraining on any of the adaptive responses measured.

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Documento generato il 04/04/20 alle ore 11:18:20