Fatigability of the knee extensors following high- and low-load resistance exercise sessions in trained men

Marshall, P.W.; Forward, Thomas; Enoka, Roger M.

doi:10.1007/s00421-021-04832-z

Cited by 2 publications

(2 citation statements)

References 51 publications

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“…The significant statistical interactions for the performance fatigability analysis indicated that the lower relative load (30% 1RM) performed to task failure resulted in a greater reduction in force (%Δ 5 41.56 6 18.61%) than the higher relative load (%Δ 5 19.65 6 8.47%). Contrary to our findings, in a sample of resistance trained men, Marshall et al (32) reported parallel declines in maximal torque of 76 and 67% after high (80% 1RM) and low (50% 1RM) load DCER leg extensions, respectively. More recently, Neltner et al (35) demonstrated parallel decreases in intraset forearm flexion torque development ranging from 32 to 38% during 50 maximal, reciprocal, isokinetic forearm flexion, and extension muscle actions at 2 distinct velocities.…”

Section: Discussioncontrasting

confidence: 99%

“…More recently, Neltner et al (35) demonstrated parallel decreases in intraset forearm flexion torque development ranging from 32 to 38% during 50 maximal, reciprocal, isokinetic forearm flexion, and extension muscle actions at 2 distinct velocities. Thus, despite performance fatigability being greater in the low- vs. high-load condition, the fatigue-induced reductions in force in this study were less than those previously reported for DCER leg extensions in men (32). The force reductions at the low-load, but not the high-load, in this study were, however, similar to those previously reported for isokinetic forearm flexion in women (35).…”

Section: Discussioncontrasting

confidence: 82%

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Load-Specific Performance Fatigability, Coactivation, and Neuromuscular Responses to Fatiguing Forearm Flexion Muscle Actions in Women

Benitez¹,

Dinyer-McNeely²,

McCallum³

et al. 2022

Journal of Strength and Conditioning Research

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Benitez, B, Dinyer-McNeeley, TK, McCallum, L, Kwak, M, Succi, PJ, and Bergstrom, HC. Load-specific performance fatigability, coactivation, and neuromuscular responses to fatiguing forearm flexion muscle actions in women. J Strength Cond Res 37(4): 769–779, 2023—This study examined the effects of fatiguing, bilateral, dynamic constant external resistance (DCER) forearm flexion on performance fatigability, coactivation, and neuromuscular responses of the biceps brachii (BB) and triceps brachii (TB) at high (80% 1 repetition maximum [1RM]) and low (30% 1RM) relative loads in women. Ten women completed 1RM testing and repetitions to failure (RTF) at 30 and 80% 1RM. Maximal voluntary isometric force was measured before and after RTF. Electromyographic (EMG) and mechanomyographic (MMG) amplitude (AMP) and mean power frequency (MPF) signals were measured from the BB and TB. Performance fatigability was greater (p < 0.05) after RTF at 30% (%∆ = 41.56 ± 18.61%) than 80% (%∆ = 19.65 ± 8.47%) 1RM. There was an increase in the coactivation ratio (less coactivation) between the initial and final repetitions at 30%, which may reflect greater increases in agonist muscle excitation (EMG AMP) relative to the antagonist for RTF at 30% than 80% 1RM. The initial repetitions EMG AMP was greater for 80% than 30% 1RM, but there was no difference between loads for the final repetitions. For both loads, there were increases in EMG MPF and MMG AMP and decreases in MMG MPF that may suggest fatigue-dependent recruitment of higher-threshold motor units. Thus, RTF at 30 and 80% 1RM during DCER forearm flexion may not necessitate additional muscle excitation to the antagonist muscle despite greater fatigability after RTF at 30% 1RM. These specific acute performance and neuromuscular responses may provide insight into the unique mechanism underlying adaptations to training performed at varying relative loads.

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Section: Discussioncontrasting

confidence: 99%

Section: Discussioncontrasting

confidence: 82%

Load-Specific Performance Fatigability, Coactivation, and Neuromuscular Responses to Fatiguing Forearm Flexion Muscle Actions in Women

Benitez¹,

Dinyer-McNeely²,

McCallum³

et al. 2022

Journal of Strength and Conditioning Research

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Higher- and lower-load resistance exercise training induce load-specific local muscle endurance changes in young women: a randomised trial

Fliss

Stevenson

Mardan-Dezfouli

et al. 2022

Appl. Physiol. Nutr. Metab.

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The effect of resistance training with higher- and lower-loads on muscle mass and strength has been extensively studied while changes in muscle endurance have received less attention. This trial aimed to assess the effect of training load on absolute (AME) and relative muscle endurance (RME). Sixteen untrained women (22.7±3.3 yr: mean ± SD) had one arm and leg randomly assigned to train with higher-loads (HL; 80-90% 1RM), and the contralateral limbs trained with lower-loads (LL; 30-50% 1RM) thrice weekly to volitional fatigue for 10 weeks. Heavy and light load AME and RME, strength, and muscle mass were assessed pre- and post-training. Strength increased more in the HL compared to LL leg (P = <0.01), but similar increases in strength were observed between upper body conditions (P = 0.46). Lower body heavy and light load AME improved in both conditions, but HL training induced a larger improvement in heavy load AME (HL, 9.3±4.3, vs. LL, 7.5±7.1 repetitions, Time × Limb P < 0.01) and LL training induced a larger improvement in light load AME (LL, 24.7±22.2, vs. HL, 15.2±16.7 repetitions, Time × Limb P = 0.04). In the upper body, HL and LL training induced similar increases in both heavy (Time × Limb P = 0.99), and light load (Time × Limb P = 0.16) AME. Dual-energy x-ray absorptiometry showed no change in leg fat-and-bone-free mass (FBFM) for either condition, and an increase in only LL arm FBFM. AME improved in a manner specific to the training loads used. ClinicalTrials.gov (NCT04547972).

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Fatigability of the knee extensors following high- and low-load resistance exercise sessions in trained men

Cited by 2 publications

References 51 publications

Load-Specific Performance Fatigability, Coactivation, and Neuromuscular Responses to Fatiguing Forearm Flexion Muscle Actions in Women

Load-Specific Performance Fatigability, Coactivation, and Neuromuscular Responses to Fatiguing Forearm Flexion Muscle Actions in Women

Higher- and lower-load resistance exercise training induce load-specific local muscle endurance changes in young women: a randomised trial

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