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Titolo:
FUNCTION OF MONOARTICULAR AND BIARTICULAR MUSCLES IN RUNNING
Autore:
JACOBS R; BOBBERT MF; SCHENAU GJV;
Indirizzi:
RS DOW NEUROL SCI INST,1120 NW 20TH AVE PORTLAND OR 97209 FREE UNIV AMSTERDAM,FAC HUMAN MOVEMENT SCI,DEPT FUNCT ANAT 1081 BT AMSTERDAM NETHERLANDS
Titolo Testata:
Medicine and science in sports and exercise
fascicolo: 10, volume: 25, anno: 1993,
pagine: 1163 - 1173
SICI:
0195-9131(1993)25:10<1163:FOMABM>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDIAL GASTROCNEMIUS-MUSCLE; LENGTHENING CONTRACTIONS; HUMAN SOLEUS; STRETCH; TENDON; WORK; ENHANCEMENT; PRESTRETCH; MECHANICS; STIFFNESS;
Keywords:
MECHANICAL OUTPUT; PLANTAR FLEXORS; MUSCLE MODELING; STRETCH-SHORTENING CYCLE; JUMP AND SPRINT PUSH-OFFS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
R. Jacobs et al., "FUNCTION OF MONOARTICULAR AND BIARTICULAR MUSCLES IN RUNNING", Medicine and science in sports and exercise, 25(10), 1993, pp. 1163-1173

Abstract

In this study the function of leg muscles during stretch-shortening cycles in fast running (6 m.s-1) was investigated. For a single stance phase, kinematics, ground reaction forces, and EMG were recorded. First, rough estimates of muscle force, obtained by shifting the EMG curves +90 ms, were correlated with origin-to-insertion velocity (V(OI)). Second, active state and internal muscle behavior were estimated by using a muscle model that was applied for soleus and gastrocnemius. High correlations were found between estimates of muscle force and V(OI) time curves for mono-articular hip, knee, and ankle extensor muscles. The correlation coefficients for biarticular muscles were low. The modelresults showed that active state of gastrocnemius was high during increase of origin-to-insertion length (L(OI)), whereas active state of soleus was low during the start of increase of L(OI) and rose to a plateau at the time lengthening ended and shortening started. It seems that the difference in stimulation between gastrocnemius and soleus is a compromise between minimizing energy dissipation and using the stretch-shortening cycle optimally. Furthermore, it was found that the net plantar flexion moment during running reached a value of 302 Nm, which was 158% and 127% higher than the peak values reached in maximal jump and sprint push-offs, respectively. It was argued that the higher mechanical output in running than in jumping could be ascribed to the utilization of the stretch-shortening cycle in running. The higher values in running compared with sprinting, however, may lie in a difference inmuscle stimulation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 21:03:13