Relationships between running economy and temporal EMG characteristics of bi-articular leg muscles
Deutscher übersetzter Titel: | Beziehungen zwischen Laufoekonomie und zeitlichen Merkmalen des EMGs zweigelenkiger Beinmuskeln |
---|---|
Autor: | Heise, G.D.; Morgan, D.W.; Hough, H.; Craib, M. |
Erschienen in: | International journal of sports medicine |
Veröffentlicht: | 17 (1996), 2, S. 128-133, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource Elektronische Ressource (online) |
Sprache: | Englisch |
ISSN: | 0172-4622, 1439-3964 |
DOI: | 10.1055/s-2007-972820 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199603106322 |
Quelle: | BISp |
Abstract des Autors
Relationships between running economy (RE; submaximal VO2 for a given running speed) and the temporal EMG characteristics of bi-articular leg muscles were quantified in a group of well-trained runners. Nine subjects completed three test sessions: a determination of maximal aerobic demand (VO2max); an accommodation session at the experimental speed of 4.13 m/s; and a session during which EMG and RE data were collected simultaneously at the experimental speed of 4.13 m/s. Measures of muscle onset, on-time duration, and on-time coactivation durations were calculated from the following muscles: rectus femoris, medial hamstrings, lateral hamstrings, and gastrocnemius. Nonparametric correlations between RE and EMG characteristics displayed both positive and negative relationships and exhibited a wide range of values. Two EMG measures were significantly correlated (r>0.67) with RE. Earlier onset of rectus femoris during swing phase and a shorter duration of hamstring-gastrocnemius coactivation during swing were associated with more economical runners. Although not statistically significant, correlation coefficients calculated for measures of coactivation during stance and RE ranged from -0.42 to -0.65. This trend indicated that individuals who exhibited a greater amount of coactivation between bi-articular muscles during the stance phase of the running cycle tended to be more economical. These relationships suggest different activation patterns in bi-articular muscles between economical and uneconomical runners. Verf.-Referat