The torque-frequency relationship is impaired similarly following two bouts of eccentric exercise: No evidence of a protective repeated bout effect

Hinks, Avery; Hess, Adam; Debenham, Mathew I.B.; Chen, Jackey; Mazara, Nicole; Inkol, Keaton A.; Cervone, Daniel T.; Spriet, Lawrence L.; Dalton, Brian H.; Power, Geoffrey A.

doi:10.1016/j.jbiomech.2021.110448

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…The non-dominant left arm was securely attached in a supinated position with the arm at 110° of elbow flexion (terminal elbow extension being 180°) for all static contractions. The range of motion of the arm was 50° to 140° excursion [16]. Electrical stimulation was delivered with two custom stimulatory pads which were constructed by multiple layers of aluminum foil secured in a paper towel.…”

Section: Experimental Set-upmentioning

confidence: 99%

No effect of menstrual cycle phase on eccentric exercise-induced neuromuscular impairments and the magnitude of the repeated bout effect

Rilling,

Power

2024

Preprint

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Neuromuscular function is impaired following an unaccustomed bout of eccentric exercise, however, through the repeated bout effect (RBE) the muscle is protected from damage following a subsequent bout of eccentric exercise. As a result of unaccustomed eccentric contractions, structural muscle damage occurs in both sexes. However, the inflammatory response may be mitigated in females due to estradiol, thereby attenuating the secondary effects of muscle damage and potentially limiting the magnitude of the RBE. We investigated the relationship between menstrual cycle phase and oral contraceptive use on neuromuscular impairments following the first bout of exercise, and the magnitude of the RBE. Thirteen female participants performed two bouts of 150 maximal eccentric voluntary contractions of the elbow flexors four weeks apart. Normally menstruating females participated during the late follicular phase (day 10-14) of their menstrual cycle, as determined through cycle tracking, when estradiol is near peak, and progesterone is lower. Oral contraceptive users were tested on their placebo pill days (lower estradiol). Neuromuscular function was assessed for Bout 1 before the eccentric protocol and then again 48 hours following, and this was repeated 4 weeks later for Bout 2. Eccentric exercise-induced muscle weakness and soreness did not differ between groups following Bout 1 (p=0.885), and the magnitude of the RBE (p<0.05) was similar between groups (p=0.995). Females in the late follicular phase (classified as high estradiol) and females on combined oral contraceptives (low estradiol) had similar impairments in neuromuscular function following the first bout of eccentric exercise, and a similar RBE.

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Section: Experimental Set-upmentioning

confidence: 99%

No effect of menstrual cycle phase on eccentric exercise-induced neuromuscular impairments and the magnitude of the repeated bout effect

Rilling,

Power

2024

Preprint

Self Cite

View full text Add to dashboard Cite

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Eccentric exercise-induced muscle weakness amplifies the history dependence of force

Contento

Power

2022

Eur J Appl Physiol

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Extreme Ultra-Trail Race Induces Muscular Damage, Risk for Acute Kidney Injury and Hyponatremia: A Case Report

Lecina

López

Otín

et al. 2021

IJERPH

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A case study involving a healthy trained male athlete who completed a 786 km multi-stage ultra-trail race. Several markers were analyzed in blood and urine samples: creatinine (SCR) for kidney damage, sodium ([Na+]) for hyponatremia, creatine kinase (CK) for exertional rhabdomyolysis, as well as other hematological values. Samples were taken before and after the race and during the recovery period (days 2 and 9 after the race). Results showed: SCR = 1.13 mg/dl, [Na+] =139 mmol/l and CK = 1.099 UI/l. Criteria for the determination of acute kidney damage were not met, and [Na+] concentration was above 135 mEq/L, indicating the absence of hyponatremia. Exertional rhabdomyolysis was suffered by the athlete (baseline CK increased fivefold), though this situation was reverted after 9 days of recovery. Ultra-trail races cause biochemical changes in athletes, which should be known about by healthcare professionals.

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The torque-frequency relationship is impaired similarly following two bouts of eccentric exercise: No evidence of a protective repeated bout effect

Cited by 3 publications

References 14 publications

No effect of menstrual cycle phase on eccentric exercise-induced neuromuscular impairments and the magnitude of the repeated bout effect

No effect of menstrual cycle phase on eccentric exercise-induced neuromuscular impairments and the magnitude of the repeated bout effect

Eccentric exercise-induced muscle weakness amplifies the history dependence of force

Extreme Ultra-Trail Race Induces Muscular Damage, Risk for Acute Kidney Injury and Hyponatremia: A Case Report

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