title: Effects of muscle strength and aerobic training on basal serum levels of IGF-1 and cortisol in elderly women.
abstract: The aim of this study was to compare the effects of muscle strength and aerobic training on the basal serum levels of IGF-1 and cortisol in elderly women. The subjects were divided in three groups as follows. 1. Strength training group (SG) submitted to the weight training called 1-repetition maximum test (1-RM, 75-85%). This group contained 12 subjects of mean age=66.08+/-3.37 years; and body mass index (BMI)=26.0+/-3.72kg/m(2). (2) Aerobic training group (AG) submitted to aquatic exercise; they were 13 subjects of the mean age=68.69+/-4.70 years; and BMI=29.19+/-2.96kg/m(2). (3) A control group (CG) of 10 subjects, of mean age=68.80+/-5.41 years; BMI=29.70+/-2.82kg/m2. The training periods were 12 weeks, Fasting blood was analyzed to measure IGF-1 and basal cortisol levels (by chemiluminescence method), both at the beginning and the end of the intervention. Student's t-test revealed increased IGF-1 in the SG (p<0.05) compared to the other two groups. Repeated-measure ANOVA showed also elevated IGF-1 (p<0.05) in the SG compared to the other groups (AG and CG). There were no differences in cortisol levels. In conclusion, high-intensity training caused changes in IGF-1. This suggests that strength training may provoke anabolic effects in elderly individuals.
authors.affiliation: Postgraduate Program in Health Sciences (PPGCSa), Federal University of Rio Grande do Norte (UFRN), Rua General Gustavo Cordeiro de Farias, s/n., Petrópolis, Natal 59010-180, Brazil.
authors.forename: Rodrigo Gomes de Souza
authors.initials: RG
authors.lastname: Vale
authors.forename: Rosana Dias
authors.initials: RD
authors.lastname: de Oliveira
authors.forename: Carlos Soares
authors.initials: CS
authors.lastname: Pernambuco
authors.forename: Yúla Pires da Silveira Fontenele
authors.initials: YP
authors.lastname: de Meneses
authors.forename: Jefferson da Silva
authors.initials: Jda S
authors.lastname: Novaes
authors.forename: Armèle de Fátima Dornelas
authors.initials: Ade F
authors.lastname: de Andrade
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D053580:Muscle Strength / Q000502:physiology*
chemical_list: D007334:Insulin-Like Growth Factor I; D006854:Hydrocortisone