Effects of muscle strength and aerobic training on basal serum levels of IGF-1 and cortisol in elderly women.
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.
Vale
Rodrigo Gomes de Souza
RG
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.
de Oliveira
Rosana Dias
RD
Pernambuco
Carlos Soares
CS
de Meneses
Yúla Pires da Silveira Fontenele
YP
Novaes
Jefferson da Silva
Jda S
de Andrade
Armèle de Fátima Dornelas
Ade F
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*
D007334:Insulin-Like Growth Factor I; D006854:Hydrocortisone