Abstract
The aim of this study was to investigate the relationship between the number of repetition maxima to volitional failure (RM) at 60%, 75%, 90% of 1RM and fatigue index (FI), a determinant of the muscular endurance level. Thirty four resistance trained male participants attended two testing sessions. The first session was conducted to assess 1RM load and RM at 60%, 75% and 90% of 1RM in the supine biceps curl (SBC) exercise. In the second session, a FI test protocol consisting of five sets of SBC with 90 s rest between sets was performed to determine FI values. Each set was performed to volitional failure using a sub-maximal load in the range of 15-20RM. Hypothetical high FI and low FI groups (17 participants with the highest and lowest FI values, respectively) were formed for statistical analyses. ANOVA results revealed that RM at 60%, 75%, 90% of 1RM were not significantly different between FI groups when controlled for mean repetition tempo (p=0.11, p=0.38, p=0.13, respectively). Pearson’s correlation coefficients revealed that no significant relationship was present between FI values and RM at 60%, 75%, 90% of 1RM (p=0.40, p=0.46, p=0.14, respectively). In conclusion, the muscular endurance level of participants defined in terms of FI value was not an indicator of RM in SBC. Therefore, athletes with different muscular endurance levels can use similar percentages of 1RM in biceps curl exercise in their training programs when the aim is to elicit training adaptations related to specific RM zones.
Highlights
Maximal strength, hypertrophy, muscular endurance and power can be enhanced by properly periodized resistance training (RT) programs (Bird et al, 2005)
No significant relationship was found between fatigue index (FI) values and RI1.Set in each FI group and in the whole sample [r(17)=0.37, p=0.14 for low FI group; r(17)=0.03, p=0.92 for high FI group; r(34)=0.26, p=0.15 for the whole sample]
It was concluded that inter-individual differences in the RI1.Set data of participants had no significant negative effects on the outcomes of this study, as well as on the FI values
Summary
Hypertrophy, muscular endurance and power can be enhanced by properly periodized resistance training (RT) programs (Bird et al, 2005). Number of sets and repetitions, rest intervals, order and choice of exercises are commonly used variables for the prescription of exercise programs. The relationship between the number of repetitions and intensity, which is defined as the amount of resistance used, is one of the most commonly studied issues in sports science. The number of repetitions maxima to volitional failure (RM) and specified percentages of one repetition maximum (%1RM) are the most common and easiest methods to define the intensity of resistance training exercise (Fleck et al, 2004; Whyte, 2006). A variety of charts and tables are generally used to define the relationship between RM and %1RM. Various prediction equations based on RM are used to predict the one repetition maximum load (1RM) in resistance training exercises (Ratamess et al, 2011).
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