Acute neuromuscular responses to resistance training performed at 100% of 10 RM and 90% of 10 RM
Date
2002
Authors
Benson, R. Chad
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Abstract
The purpose of the investigation was to determine the acute neuromuscular responses and total exercise volume of thirteen male subjects, experienced in resistance training, (RT) in response to two different RT protocols. Protocol A consisted of a single-arm flex ion exercise for 3 sets of a 10 RM load to failure on each set using approximately 100% of a IO RM. Protocol B involved 3 sets at 90% of a 10 RM load. Failure was determined by having subjects during protocol A perform each of the 3 sets at a 10 RM load until no fm1her contractions could be completed. The subjects in protocol B preformed 10 repetitions for the first 2 sets at a 90% of 10 RM load. In the third set repetitions were performed until temporary muscle failure. regardless of the number of repetitions the subjects were able to complete. Both protocols incorporated a 3 min rest interval between sets. Blood lactate, MVIC, and EMG were measured prior to and upon completion of each loading protocol. When performing protocol B the subjects were able to complete a greater total volume (reps x sets x load) of exercise, but both protocols elicited similar significant increases in blood lactate and decreases in MVIC and iEMGrnax (p=<.05). Although, volitional fatigue was postponed while using 90% of IO RM. the acute changes in neuromuscular fatigue were comparable. despite the 10% difference in loading intensity. Additionally. traditional strength training protocols involving repetitions to failure in each set may not optimize the total volume of resistance exercise. which may have implications for chronic adaptation.