The influence of subjective intensity control on perceived fatigue and capillary lactate in two types of resistance training

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Cauê Vazquez La Scala Teixeira, Sionaldo Eduardo Ferreira, Ricardo José Gomes. Revista Brasileira de Cineantropometria e Desempenho Humano, v. 17, n. 3, p. 309-317, 2015.

Abstract: Rating of perceived exertion (RPE) is a method used to control intensity in
resistance training (RT). However, few studies have compared acute physiological and
perceptual responses between different types of RT. The objective of this study was to
compare the acute responses of lactate and perceived fatigue (PF) between manual resistance
training (MRT) and free weight RT (FWRT) with intensity control by RPE, and to
evaluate the correlation between lactate and PF in both interventions. Fourteen previously
untrained men (40.29 ± 8.63 years, BMI = 26.53 ± 5.24 kg/m²) underwent single sessions
of MRT and FWRT with intensity control by RPE (5-7 OMNI-RES). Lactate and PF were
analyzed pre and post-test. Repeated measures ANOVA and the post hoc Bonferroni test
were used for data analysis, adopting a significance level of 5% (P ≤ 0.05). The effect size
was calculated to determine the magnitude of the response and Pearson’s correlation
coefficient was used to assess the association between lactate and PF. Both interventions
increased post-test lactate compared to pre-test levels. However, the increase was greater
for MRT. Post-test PF was increased when compared to pre-test levels in both protocols,
with no difference between interventions. However, a greater effect size was observed for
MRT. The correlation between PF and lactate was moderate in three of the four assessments.
In conclusion, the same intensity zone in RPE may elicit different physiological
responses in the two types of RT. Thus, the use of RPE for intensity control under these
conditions should be viewed with caution.

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