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Title: Isoinertial and isokinetic sprints: Muscle signalling
Authors: Fuentes, Teresa 
Ponce-González, J. G.
Morales Alamo, David 
de Torres-Peralta, R. 
Santana Rodríguez, Alfredo 
De Pablos Velasco, Pedro Luis 
Olmedillas, Hugo
Guadalupe-Grau, A. 
Rodríguez-García, Lorena
Serrano-Sanchez, J. A. 
Guerra, B. 
Calbet, J. A. L. 
UNESCO Clasification: 241106 Fisiología del ejercicio
Keywords: Leptin, Muscle signalling, Sprint exercise, Wingate
Issue Date: 2013
Publisher: 0172-4622
Project: Influencia Del Ejercicio Físico en Los Mecanismos de Señalización de Leptina en El Músculo Esquelético Humano. 
Oxygenación Cerebral y Fatiga Durante El Ejercicio en Hipoxia Aguda 
Influencia Del Ejercicio Fisico, la Fio2 y El Estres Oxidativo en la Señalización Por Ampk en El Músculo Esquelético Humano. 
Integracion de Los Grupos de la Obesidad y El Síndrome Metabólico .... 
Influencia Del Ejercicio Físico Regular en la Expresión Proteica y Nivel de Fosforilación (Activación) de la Isoforma Larga Del Receptor de Leptina en Músculo Esquelético Humano. 
Journal: International Journal of Sports Medicine 
Abstract: To determine if the muscle signalling response to a 30 s all-out sprint exercise is modulated by the exercise mode and the endocrine response, 27 healthy volunteers were divided in 2 groups that performed isokinetic (10 men and 5 women) and isoinertial (7 men and 5 women) Wingate tests. Blood samples and vastus lateralis muscle biopsies were taken before, immediately after, 30 and 120 min after the sprints. Groups were comparable in age, height, body weight, percentage of body fat, peak power per kg of lower extremities lean mass (Pmax) and muscle fibre types. However, the isoinertial group achieved a 25% greater mean power (Pmean). Sprint exercise elicited marked increases in the musculus vastus lateralis AMPKα, ACCβ, STAT3, STAT5 and ERK1/2 phosphorylation (all P<0.05). The AMPKα, STAT3, and ERK1/2 phosphorylation responses were more marked after the isoinertial than isokinetic test (interaction: P<0.01). The differences in muscle signalling could not be accounted for by differences in Pmax, although Pmean could explain part of the difference in AMPKα phosphorylation. The leptin, insulin, glucose, GH, IL-6, and lactate response were similar in both groups. In conclusion, the muscle signalling response to sprint exercise differs between isoinertial and isokinetic sprints.
ISSN: 0172-4622
DOI: 10.1055/s-0032-1312583
Source: International Journal Of Sports Medicine[ISSN 0172-4622],v. 34 (4), p. 285-292
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