Tags

Type your tag names separated by a space and hit enter

Effect of instructions on EMG during the bench press in trained and untrained males.
Hum Mov Sci. 2017 Oct; 55:182-188.HM

Abstract

Strength and rehabilitation professionals strive to emphasize certain muscles used during an exercise and it may be possible to alter muscle recruitment strategies with varying instructions. This study aimed to determine whether resistance trained and untrained males could selectively activate the pectoralis major or triceps brachii during the bench press according to various instructions. This study included 13 trained males (21.5±2.9years old, 178.7±7.0cm, 85.7±10.7kg) and 12 untrained males (20.3±1.6years old, 178.8±9.4cm, 74.6±17.3kg). Participants performed a bench press one-repetition maximum (1-RM) test, 3 uninstructed repetitions at 80% 1-RM and two more sets of three repetitions with instructions to isolate the chest or arm muscles. Electromyography (EMG) was obtained from the pectoralis major, anterior deltoid, and the long head and short head of the triceps brachii. Maximum EMG activity normalized to 1-RM for each muscle was averaged over the three repetitions for each set and compared between the uninstructed, chest-instructed and arm-instructed conditions among the groups. The trained participants had a greater 1-RM (126.2±30.6kg) than the untrained participants (61.6±14.8kg) (P<0.01). EMG activity was not different between the groups for any of the instructions (P>0.05). When the group data was combined, short head of the triceps activity was significantly lower in the chest instruction (80.1±19.3%) when compared to the uninstructed (85.6±23.3%; P=0.01) and arm-instructed (86.0±23.2; P=0.01) conditions. It can be concluded that instructions can affect muscle activation during the bench press, and this is not dependent on training status.

Authors+Show Affiliations

University of New Hampshire, 124 Main Street, Durham, NH, 03824, USA.University of New Hampshire, 124 Main Street, Durham, NH, 03824, USA. Electronic address: summer.cook@unh.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28841536

Citation

Daniels, Rebecca J., and Summer B. Cook. "Effect of Instructions On EMG During the Bench Press in Trained and Untrained Males." Human Movement Science, vol. 55, 2017, pp. 182-188.
Daniels RJ, Cook SB. Effect of instructions on EMG during the bench press in trained and untrained males. Hum Mov Sci. 2017;55:182-188.
Daniels, R. J., & Cook, S. B. (2017). Effect of instructions on EMG during the bench press in trained and untrained males. Human Movement Science, 55, 182-188. https://doi.org/10.1016/j.humov.2017.08.010
Daniels RJ, Cook SB. Effect of Instructions On EMG During the Bench Press in Trained and Untrained Males. Hum Mov Sci. 2017;55:182-188. PubMed PMID: 28841536.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of instructions on EMG during the bench press in trained and untrained males. AU - Daniels,Rebecca J, AU - Cook,Summer B, Y1 - 2017/08/24/ PY - 2017/01/03/received PY - 2017/08/14/revised PY - 2017/08/15/accepted PY - 2017/8/26/pubmed PY - 2018/4/25/medline PY - 2017/8/26/entrez KW - Internal focus KW - Muscle activity KW - Strength training SP - 182 EP - 188 JF - Human movement science JO - Hum Mov Sci VL - 55 N2 - Strength and rehabilitation professionals strive to emphasize certain muscles used during an exercise and it may be possible to alter muscle recruitment strategies with varying instructions. This study aimed to determine whether resistance trained and untrained males could selectively activate the pectoralis major or triceps brachii during the bench press according to various instructions. This study included 13 trained males (21.5±2.9years old, 178.7±7.0cm, 85.7±10.7kg) and 12 untrained males (20.3±1.6years old, 178.8±9.4cm, 74.6±17.3kg). Participants performed a bench press one-repetition maximum (1-RM) test, 3 uninstructed repetitions at 80% 1-RM and two more sets of three repetitions with instructions to isolate the chest or arm muscles. Electromyography (EMG) was obtained from the pectoralis major, anterior deltoid, and the long head and short head of the triceps brachii. Maximum EMG activity normalized to 1-RM for each muscle was averaged over the three repetitions for each set and compared between the uninstructed, chest-instructed and arm-instructed conditions among the groups. The trained participants had a greater 1-RM (126.2±30.6kg) than the untrained participants (61.6±14.8kg) (P<0.01). EMG activity was not different between the groups for any of the instructions (P>0.05). When the group data was combined, short head of the triceps activity was significantly lower in the chest instruction (80.1±19.3%) when compared to the uninstructed (85.6±23.3%; P=0.01) and arm-instructed (86.0±23.2; P=0.01) conditions. It can be concluded that instructions can affect muscle activation during the bench press, and this is not dependent on training status. SN - 1872-7646 UR - https://www.unboundmedicine.com/medline/citation/28841536/Effect_of_instructions_on_EMG_during_the_bench_press_in_trained_and_untrained_males_ DB - PRIME DP - Unbound Medicine ER -