A number of methods for determining upper body maximal strength arepresent. The 1-RM is defined as the maximum amount of resistance thatcan be performed for only 1 repetition and it has been shown to be reliablein various populations. Further, setting an intensity of resistancetraining based on a percentage of the 1-RM has been found to be effectivefor improving outcomes such as muscle strength, muscle power,and muscle hypertrophy. Little is known about the metabolic cost of1RM evaluation and which is the optimal recovery time between sessions.We analyzed the physiological response during a standardizedprotocol of 1RM-Bench Press Test (1RM-BP). Fourteen healthy subjects(25,6±7,4 yrs; 166,3±0,9 cm; 65,6±13,2 kg) performed a 1RM-BPfollowing standardized procedures. VO2 and Heart Rate ware measuredbefore, during and after the BP performance while Systolic (Sys) andDiastolic (Dys) pressure were measured only before and after the test. Atthe e! nd of the 1RM-BP , Blood Lactate (BL)was assessed and participantswere asked for perceived exertion according with the Borg Scale(RPE). The protocol consisted of five steps; 15 repetitions with � of thesubjects body weight were performed in the first step, subsequentlyweight was added up to ½ of bodyweight and a maximal number of repetitionswere performed. In the third step the participants executed thetheoretical 1RM-BP according to the Mayhew’s formula that considersthe number of repetitions completed with ½ bodyweight of each subject.The other steps ware performed only if the third one was completed, ifnot 2-5% more weight was added on the barbell until 1RM was obtained,this was repeated if necessary for a maximum of other 2 times.The results show that there are no significant differences in VO2 valuesbetween male and female, only in the second step (½ Bodyweight) malesachieve higher results (p=0,0032). BL was significantly! higher inmale(p=0,042) even if %Lean mass was not quite significantly higherthan female(p=0,0532). The most interesting result is shown by Pearson’scorrelation between %Lean mass vs 1RM-BP; male were positively correlated(r=0,61) while female were negatively (r=-0,65).Unexpected results need to be confirmed by a larger number of participants,but at this stage this study shows that in any case there are genderdifferences. Furthermore, this study confirms the reliability, feasibilityand safety of the 1RM-BP.
|Numero di pagine||1|
|Stato di pubblicazione||Published - 2012|