Neuromuscular fatigue during dynamic maximal strength and hypertrophic resistance loadings

Walker, Simon; Davis, Lisa; Avela, Janne; Häkkinen, Keijo

doi:10.1016/j.jelekin.2011.12.009

Cited by 75 publications

(79 citation statements)

References 33 publications

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“…For hypertrophy-type sessions (H) were studied using 3 to 5 sets, ~10 repetitions maximal or 70 to 80% 1RM, and rest intervals of 90 seconds to 3 minutes [1][2][3][4]24] . The reduction of ~24% on peak force after a H session is in accordance with previous studies (~16 to 48%) [5,6,22,23] . In addition, the S and H session presented high values for total volume load when compared to the P session.…”

Section: Discussionsupporting

confidence: 92%

“…The S session allows a high amount of load to be lifted, and, it also induces a drop in the peak force (~25%) [5,6,22,23] . Despite all differences in our procedures, it was observed 7 to 30% in the reduction of peck force that corroborates with previously studies [5,6,22,23] . On the other hand, the effects observed in force and total volume load of the present study cannot be only attributed to neural adjustments, as shown by IEMG and median frequency.…”

Section: Discussionmentioning

confidence: 99%

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Acute neuromuscular and metabolic responses to upper body strength, power, and hypertrophy protocols in resistance trained men

Corrêa¹,

Lopes²,

Paulodetto³

et al. 2017

Int. J. Sport Exc. Health Res.

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Aim: The purpose of this study was to compare the acute neuromuscular and metabolic responses between strength (S), hypertrophy (H), and power (P) resistance training protocols in the elbow flexors. Methods: Fourteen resistance trained men (age: 25 ± 4 years, body mass: 79.5 ± 9 kg, height: 177 ± 4cm) volunteered to participate. They attended four sessions separated by at least one week. On the first session, they performed a one repetition maximum (1RM) test for the standing barbell curl exercise. On the following three sessions, the training protocols were randomized to either a S (11 sets of 3 repetitions, 90% 1RM, 5-minute rest), H (4 sets of 10 repetitions, 75% 1RM, 90-second rest), or P (8 sets of 6 repetitions, 30% 1RM, 3-minute rest). Peak force (PF) and biceps brachii muscle activity (EMG) were quantified before and after each session via maximal voluntary isometric contraction of the elbow flexors. Blood samples were taken before and at 0, 3, 5, 10, 15 and 30 minutes after each session to measure the concentration of blood lactate (BL). Results: Higher total volume load (VL) in the S protocol compared to H (577.5±142.2 vs 568.5±133.3, P=0.03, respectively), and S compared to P (577.5±142.2 vs 294.8±67.5, P=0.001, respectively). Additionally, H showed higher VL compared to P (P=0.001). Conclusion: This study showed that the equated load between muscular strength and hypertrophy protocols compromised the neuromuscular and metabolic performance after single-joint exercise for upper limbs.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Acute neuromuscular and metabolic responses to upper body strength, power, and hypertrophy protocols in resistance trained men

Corrêa¹,

Lopes²,

Paulodetto³

et al. 2017

Int. J. Sport Exc. Health Res.

View full text Add to dashboard Cite

show abstract

“…20 However, the incremental increases in EMG found in this study could indicate increased central drive to overcome fatigue. 18,19 Although the placement of the looped band considerably influenced EMG amplitudes during the repetitions to failure 60% of estimated 1RM test, it did not statistically influence the number of repetitions completed. However, on average, the number of repetitions completed by participants increased by 1 in the loopedband condition.…”

Section: Discussionmentioning

confidence: 90%

“…The increase in EMG amplitudes with increasing repetition number is typical during submaximal fatiguing contractions. 18,19 It may be that EMG amplitudes increased to sustain the required efforts: with each completed repetition, muscle fatigue develops for various central and peripheral nervous system reasons. EMG is a crude measure of central drive, as it is also influenced by peripheral factors.…”

Section: Discussionmentioning

confidence: 99%

Looped Band Placed Around Thighs Increases EMG of Gluteal Muscles Without Hindering Performance During Squatting

Spracklin

Button

Halperin

2017

JPHR

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Background: There is little information about the effects of placing a resistance band around the outer thighs on the amplitude of performance and electromyography (EMG) of lower body muscles during a free barbell back squat (FBBS) activity. This study quantified EMG amplitudes of the gluteus medius, gluteus maximus, vastus lateralis, and biceps femoris during an FBBS with and without the use of a looped resistance band. In addition, the effects of the looped band on the number of repetitions completed on failure in performing FBBS were measured at 2 intensities. Methods: In this study, 15 resistance-trained males (age, 23.6 6 3.5 years) completed an FBBS 3 repetition maximum (RM) test on the first testing day to estimate their 1RM. On days 2 and 3, participants completed 5 repetitions equal to 80% of their estimated 1RM followed by a repetition to failure test using 60% of estimated 1RM with and without a band placed around their thighs in a counter-balanced fashion while EMG amplitudes were collected. Results: No differences were found at 60% intensity test between conditions (band: 21.4 6 6, control: 20.4 6 4.7; P = .171). Similarly, no differences were found between conditions in EMG of the vastus lateralis or biceps femoris at both intensities (effect size [ES] range = 0.01-0.4, P ≥ .05). In contrast, other than a few exceptions, gluteus medius and maximus showed greater EMG activity in the looped-band condition during tests (ES range = 0.28-1.15, P < .05) at both 60% and 80% intensities. Conclusion: Placing a looped resistance band around the thighs can be used as a training strategy to increase the activation of the hip muscles during FBBS using medium to heavy loads without negatively affecting performance.

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“…Furthermore, Walker et al (2012) showed that hypertrophic loading (5 sets of 10RM) produces neuromuscular fatigue dominated by peripheral factors, whereas fatigue induced by maximal loading (15 sets of 1RM) seems to be caused by a reduction in neural drive to the muscle.…”

Section: Introductionmentioning

confidence: 99%

Changes in corticospinal excitability during an acute bout of resistance exercise in the elbow flexors

et al. 2014

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Methods: Eleven volunteers participated in the upper arm HRE which included one repetition maximum (1 RM) control contractions and three sets of 13 RM (SET1-3). Transcranial magnetic stimulation (TMS) was applied during maximal isometric voluntary contraction (MVC) at the end of each set and during control contractions to study changes in corticospinal excitability. Electrical stimulation was used in order to measure peripheral changes.Results: MVC decreased after each set when compared to control contractions. Motor evoked potential (MEP) were 138.7 ± 52.7 % (p < 0.05), 130.4 ± 44.7 % and 113.1 ± 31.4% after SET1, SET2 and SET3, respectively, when compared to pre-exercise value. A significant reduction in MEP area between SET1 and SET3 (p < 0.05) was observed while silent period (SP) duration increased (~151-165ms, p<0.05) simultaneously between these sets. TMS evoked twitch force during MVC increased significantly following each set when compared to pre-exercise value. Simultaneously a significant reduction was observed in resting twitch force over the sets. Conclusions:The results of this study clearly support the existence of both central and peripheral fatigue during HRE of elbow flexors. However, changes in the MEP area and SP suggest that during HRE of the elbow flexors, the corticospinal excitability increases first, until at some point, supraspinal fatigue takes over.

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Neuromuscular fatigue during dynamic maximal strength and hypertrophic resistance loadings

Cited by 75 publications

References 33 publications

Acute neuromuscular and metabolic responses to upper body strength, power, and hypertrophy protocols in resistance trained men

Acute neuromuscular and metabolic responses to upper body strength, power, and hypertrophy protocols in resistance trained men

Looped Band Placed Around Thighs Increases EMG of Gluteal Muscles Without Hindering Performance During Squatting

Changes in corticospinal excitability during an acute bout of resistance exercise in the elbow flexors

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