Evaluation of muscle activity during a standardized shoulder resistance training bout in novice individuals

Markus D Jakobsen, Emil Sundstrup, Christoffer H Andersen, Mette K Zebis, Peter Mortensen, Lars L Andersen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Momentary fatigue is an important variable in resistance training periodization programs. Although several studies have examined neuromuscular activity during single repetitions of resistance training, information is lacking in regard to neuromuscular fatigue indices throughout a full resistance training bout. The purpose of this study was to evaluate muscle activity during a shoulder resistance training bout with 15 repetitions maximum (RM) loadings in novice individuals. Twelve healthy sedentary women (age = 27-58 years; weight = 54-85 kg; height = 160-178 cm) were recruited for this study. Normalized electromyographic (nEMG) activity and median power frequency (MPF) of the upper, medial, and lower trapezius; the medial deltoid, infraspinatus, and serratus anterior was measured during 3 sets of 15RM during the exercises front raise, reverse flyes, shrugs, and lateral raise. For the majority of exercises, nEMG activity was high (>60% of maximal isometric contractions). From the first to the last repetition of each set nEMG-averaged for all muscles-increased 10. 0 ± 0.4% (p <0.05) and MPF decreased -7.7 ± 0.5 Hz (p <0.05). By contrast, nEMG activity and MPF were unchanged from the first to the third set (averaged for all muscles: 38.1 ± 23.6 vs. 47.6 ± 28.8% and 88.4 ± 21.3 vs. 82.1 ± 18.1 Hz, respectively). In conclusion, during a shoulder resistance training bout in novice individuals using 15RM loading muscle activity of the upper, medial, and lower trapezius, the medial deltoid, infraspinatus, and serratus anterior increased, and MPF decreased within each set-indicating momentary neuromuscular fatigue. By contrast, no such change was observed between the 3 sets. This indicates that momentary neuromuscular fatigue in shoulder resistance training is induced more efficiently within a set than between sets.
OriginalsprogEngelsk
TidsskriftJournal of Strength and Conditioning Research
Vol/bind26
Udgave nummer9
Sider (fra-til)2515-22
Antal sider8
ISSN1064-8011
DOI
StatusUdgivet - 2012

Fingeraftryk

Resistance Training
Muscles
Rotator Cuff
Superficial Back Muscles
Exercise
Isometric Contraction
Education
Weights and Measures

Citer dette

Jakobsen, Markus D ; Sundstrup, Emil ; Andersen, Christoffer H ; Zebis, Mette K ; Mortensen, Peter ; Andersen, Lars L. / Evaluation of muscle activity during a standardized shoulder resistance training bout in novice individuals. I: Journal of Strength and Conditioning Research. 2012 ; Bind 26, Nr. 9. s. 2515-22.
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title = "Evaluation of muscle activity during a standardized shoulder resistance training bout in novice individuals",
abstract = "Momentary fatigue is an important variable in resistance training periodization programs. Although several studies have examined neuromuscular activity during single repetitions of resistance training, information is lacking in regard to neuromuscular fatigue indices throughout a full resistance training bout. The purpose of this study was to evaluate muscle activity during a shoulder resistance training bout with 15 repetitions maximum (RM) loadings in novice individuals. Twelve healthy sedentary women (age = 27-58 years; weight = 54-85 kg; height = 160-178 cm) were recruited for this study. Normalized electromyographic (nEMG) activity and median power frequency (MPF) of the upper, medial, and lower trapezius; the medial deltoid, infraspinatus, and serratus anterior was measured during 3 sets of 15RM during the exercises front raise, reverse flyes, shrugs, and lateral raise. For the majority of exercises, nEMG activity was high (>60{\%} of maximal isometric contractions). From the first to the last repetition of each set nEMG-averaged for all muscles-increased 10. 0 ± 0.4{\%} (p <0.05) and MPF decreased -7.7 ± 0.5 Hz (p <0.05). By contrast, nEMG activity and MPF were unchanged from the first to the third set (averaged for all muscles: 38.1 ± 23.6 vs. 47.6 ± 28.8{\%} and 88.4 ± 21.3 vs. 82.1 ± 18.1 Hz, respectively). In conclusion, during a shoulder resistance training bout in novice individuals using 15RM loading muscle activity of the upper, medial, and lower trapezius, the medial deltoid, infraspinatus, and serratus anterior increased, and MPF decreased within each set-indicating momentary neuromuscular fatigue. By contrast, no such change was observed between the 3 sets. This indicates that momentary neuromuscular fatigue in shoulder resistance training is induced more efficiently within a set than between sets.",
author = "Jakobsen, {Markus D} and Emil Sundstrup and Andersen, {Christoffer H} and Zebis, {Mette K} and Peter Mortensen and Andersen, {Lars L}",
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Evaluation of muscle activity during a standardized shoulder resistance training bout in novice individuals. / Jakobsen, Markus D; Sundstrup, Emil; Andersen, Christoffer H; Zebis, Mette K; Mortensen, Peter; Andersen, Lars L.

I: Journal of Strength and Conditioning Research, Bind 26, Nr. 9, 2012, s. 2515-22.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Evaluation of muscle activity during a standardized shoulder resistance training bout in novice individuals

AU - Jakobsen, Markus D

AU - Sundstrup, Emil

AU - Andersen, Christoffer H

AU - Zebis, Mette K

AU - Mortensen, Peter

AU - Andersen, Lars L

PY - 2012

Y1 - 2012

N2 - Momentary fatigue is an important variable in resistance training periodization programs. Although several studies have examined neuromuscular activity during single repetitions of resistance training, information is lacking in regard to neuromuscular fatigue indices throughout a full resistance training bout. The purpose of this study was to evaluate muscle activity during a shoulder resistance training bout with 15 repetitions maximum (RM) loadings in novice individuals. Twelve healthy sedentary women (age = 27-58 years; weight = 54-85 kg; height = 160-178 cm) were recruited for this study. Normalized electromyographic (nEMG) activity and median power frequency (MPF) of the upper, medial, and lower trapezius; the medial deltoid, infraspinatus, and serratus anterior was measured during 3 sets of 15RM during the exercises front raise, reverse flyes, shrugs, and lateral raise. For the majority of exercises, nEMG activity was high (>60% of maximal isometric contractions). From the first to the last repetition of each set nEMG-averaged for all muscles-increased 10. 0 ± 0.4% (p <0.05) and MPF decreased -7.7 ± 0.5 Hz (p <0.05). By contrast, nEMG activity and MPF were unchanged from the first to the third set (averaged for all muscles: 38.1 ± 23.6 vs. 47.6 ± 28.8% and 88.4 ± 21.3 vs. 82.1 ± 18.1 Hz, respectively). In conclusion, during a shoulder resistance training bout in novice individuals using 15RM loading muscle activity of the upper, medial, and lower trapezius, the medial deltoid, infraspinatus, and serratus anterior increased, and MPF decreased within each set-indicating momentary neuromuscular fatigue. By contrast, no such change was observed between the 3 sets. This indicates that momentary neuromuscular fatigue in shoulder resistance training is induced more efficiently within a set than between sets.

AB - Momentary fatigue is an important variable in resistance training periodization programs. Although several studies have examined neuromuscular activity during single repetitions of resistance training, information is lacking in regard to neuromuscular fatigue indices throughout a full resistance training bout. The purpose of this study was to evaluate muscle activity during a shoulder resistance training bout with 15 repetitions maximum (RM) loadings in novice individuals. Twelve healthy sedentary women (age = 27-58 years; weight = 54-85 kg; height = 160-178 cm) were recruited for this study. Normalized electromyographic (nEMG) activity and median power frequency (MPF) of the upper, medial, and lower trapezius; the medial deltoid, infraspinatus, and serratus anterior was measured during 3 sets of 15RM during the exercises front raise, reverse flyes, shrugs, and lateral raise. For the majority of exercises, nEMG activity was high (>60% of maximal isometric contractions). From the first to the last repetition of each set nEMG-averaged for all muscles-increased 10. 0 ± 0.4% (p <0.05) and MPF decreased -7.7 ± 0.5 Hz (p <0.05). By contrast, nEMG activity and MPF were unchanged from the first to the third set (averaged for all muscles: 38.1 ± 23.6 vs. 47.6 ± 28.8% and 88.4 ± 21.3 vs. 82.1 ± 18.1 Hz, respectively). In conclusion, during a shoulder resistance training bout in novice individuals using 15RM loading muscle activity of the upper, medial, and lower trapezius, the medial deltoid, infraspinatus, and serratus anterior increased, and MPF decreased within each set-indicating momentary neuromuscular fatigue. By contrast, no such change was observed between the 3 sets. This indicates that momentary neuromuscular fatigue in shoulder resistance training is induced more efficiently within a set than between sets.

U2 - 10.1519/JSC.0b013e31823f29d9

DO - 10.1519/JSC.0b013e31823f29d9

M3 - Journal article

VL - 26

SP - 2515

EP - 2522

JO - Journal of Strength and Conditioning Research

JF - Journal of Strength and Conditioning Research

SN - 1064-8011

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