One Repetition Maximum Test Reliability In The Lat Pulldown
Sandro Sperandei, Marcos André Pereira de Barros, Paulo C S Silveira-Júnior, Carlos Gomes de Oliveira · Medicine & Science in Sports & Exercise · 2005
The one repetition test (1RM) is used in many researches about resistance training effects and variables. However, the test reliability was little assessed and presents great importance to research planning and results analysis. PURPOSE To asses the test reliability at the lat pull down exercise in men and women. METHODS Healthful and active men (n = 26, 25 ± 3 years, 177 ± 5.3 cm, 76.8 ± 9.86 kg, 12,5 ± 4,25 % body fat) and women (n = 17, 27 ± 5 years, 160 ± 5.7 cm, 54.6 ± 6.76 kg, 21.1 ± 4.08 % body fat) volunteered to the study, signing an informed consent prior to the realization of the testes. The data were collected in two visits, separated by 48–72 hours. In the first visit, anthropometric data were collected and a progressive 1RM test was realized. After each successful attempt, five kilos were added to the load, until a fail occurs. Them, load was decreased by three kilos and a new attempt was done. It was respected a five minutes rest between the attempts. In the second visit, the 1RM procedure was repeated. Since there was no statistical difference between men and women between-days error, both values were combined. The limits of agreement technique was used to asses random errors and paired t test to asses systematic errors. RESULTS The maximum loads were 97.5 ± 14.1 kg and 100.6 ± 14.46 kg to men and 42.5 ± 5.83 kg and 44.8 ± 6.9 kg to women, first and second day (P = 0.228). The loads combined were 75.7 ± 29.48 kg and 78.5 ± 30.08 kg, first and second day. There was between-days statistical difference (P<0.0001), with a 95% confidence interval to random errors varying between −2.4 to 7.9 kg. CONCLUSIONS It was observed a systematic between-days bias, with a tendency to increased loads in the second day. The results presented here must be considered when planning and analyzing resistance training results where 1RM tests were used to asses effects in strength.