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Titolo:
DIFFERENCES IN MECHANICAL EFFICIENCY BETWEEN POWER-TRAINED AND ENDURANCE-TRAINED ATHLETES WHILE JUMPING
Autore:
KYROLAINEN H; KOMI PV;
Indirizzi:
UNIV JYVASKYLA,DEPT BIOL PHYS ACTIV SF-40100 JYVASKYLA FINLAND
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 1, volume: 70, anno: 1995,
pagine: 36 - 44
SICI:
0301-5548(1995)70:1<36:DIMEBP>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN MOTOR UNITS; LOCOMOTION; MUSCLES; EXERCISE; RECRUITMENT; ENERGY; SIZE;
Keywords:
MECHANICAL EFFICIENCY; STRETCH-SHORTENING CYCLE; ELECTROMYOGRAPHY; JUMPING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
H. Kyrolainen e P.V. Komi, "DIFFERENCES IN MECHANICAL EFFICIENCY BETWEEN POWER-TRAINED AND ENDURANCE-TRAINED ATHLETES WHILE JUMPING", European journal of applied physiology and occupational physiology, 70(1), 1995, pp. 36-44

Abstract

Mechanical efficiency (ME) of jumping exercises was compared between power-trained (n=11) and endurance-trained athletes (n=10) using both a biomechanical and a physiological approach. In drop jumps and in stretch-shortening cycle exercise on a special sledge (sledge jumps), thesubjects performed 60 muscle actions from a dropping height of optimum minus 40 cm (0-40), as well as from dropping heights of optimum (0) and optimum plus 40 cm (0+40). Thus, they were tested in six differenttests which lasted for a total of 3 min for each. The mean ME values in the drop jumps from the lowest dropping height upwards were as follows: 23.8 (SD 5.3)%, 35.5 (SD 10.8)% and 39.2 (SD 6.6)% for the power group, and 30.8 (SD 6.5)%, 37.5 (SD 8.7)% and 41.4 (SD 7.0)% for the endurance group. In the sledge jumps the ME values were 37.0 (SD 5.6)%,48.4 (SD 4.0)% and 54.9 (SD 8.5)% for the power group, and 40.2 (SD 5.9)%, 46.9 (SD 5.7)% and 58.5 (SD 5.5)% for the endurance group. As can be seen, the ME values increased with increasing stretch load. However, the groups did not differ from each other except in the drop jump condition of 0-40 (P<0.05). The higher power (P<0.001) among the powerathletes in every measured condition was associated with a faster rate of electromyogram development during the pre-activity, and smoother muscle activity patterns in the ground contact. On the other hand, theendurance athletes had a lower blood lactate concentration after every test, and in addition a lower heart rate and ventilation during the sledge jumps than their power counterparts. Therefore, it would seem that the similar mean ME values between the subject groups could be explained by improved function of the neuromuscular system among the power group and improved metabolism among the endurance group.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 17:23:17