Research article - (2016)15, 562 - 568
Effects of the Drop-set and Reverse Drop-set Methods on the Muscle Activity and Intramuscular Oxygenation of the Triceps Brachii among Trained and Untrained Individuals
Masahiro Goto1,2, Shinsuke Nirengi3, Yuko Kurosawa4, Akinori Nagano1, Takafumi Hamaoka4,
1Graduate School of Sport and Health Science, Ritsumeikan University, Japan
2Department of Physical Therapy, Aino University, Japan
3Division of Preventive Medicine, Clinical Research Institute, National Hospital Organization Kyoto Medical Center, Kyoto, Japan
4Department of Sports Medicine for Health Promotion, Tokyo Medical University, Japan

Takafumi Hamaoka
✉ Department of Sports Medicine for Health Promotion, Tokyo Medical University, 6-1-1 Shinjuku, Shinjuku, Tokyo 160-8402, Japan
Email: kyp02504@nifty.com
Received: 22-02-2016 -- Accepted: 10-08-2016
Published (online): 01-12-2016
ABSTRACT

Influence of different load exercise to muscle activity during subsequent exercise with 75% of one repetition maximum (RM) load among trained and untrained individuals was verified. Resistance-trained men who were involved in resistance training (n = 16) and healthy young men who did not exercise regularly (n = 16) were recruited for this study. Each subject performed bench pressing with a narrow grip exercise using two different training set methods, the drop-set (DS) (3 sets × 2-10 repetitions with 95-75% of 1RM) and the reverse drop-set (RDS) (3 sets × 3-10 repetitions with 55-75% of 1RM). The mean concentric contraction power, root mean square (RMS) of electromyography (EMG), area under the oxygenated hemoglobin (Oxy-Hb) curve, and time constant for muscle oxygen consumption (TcVO2mus) values of the triceps brachii were measured during and after the DS and RDS. The trained group demonstrated significantly higher mean muscle power (242.9 ± 39.6 W vs. 215.8 ± 31.7 W), RMS of EMG (86.4 ± 10.4 % vs. 68.3 ± 9.6 %), and area under the Oxy-Hb curve (38.6 ± 7.4 %• sec vs. 29.3 ± 5.8 %• sec) values during the DS than during the RDS (p < 0.05). However, in the untrained group none of the parameters differed significantly for both the DS and RDS. Furthermore, a negative correlation was detected between the area under the Oxy-Hb curve and muscle thickness (r = -0.51, p < 0.01). Long-term effects of DS on muscle strengthening and hypertrophy will be explored in further research.
Key words: Drop-set, resistance exercise, hypertrophy, hypoxia, NIRS

Key Points
  • The DS induced greater motor unit activation and intramuscular hypoxia in people who have been regularly performing resistance exercises for more than one year than the RDS.
  • No mechanical or metabolic differences were detected between the DS and RDS among the subjects who had not participated in regular resistance training.
  • The thicker a person’s muscles are, the more resistant they are to the induction of acute intramuscular hypoxia during muscle contraction.








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Effects of the Drop-set and Reverse Drop-set Methods on the Muscle Activity and Intramuscular Oxygenation of the Triceps Brachii among Trained and Untrained Individuals
Masahiro Goto, Shinsuke Nirengi, Yuko Kurosawa, Akinori Nagano, Takafumi Hamaoka
2016(15), 562 - 568.
DOI: https://doi.org/