Low-intensity elbow flexion eccentric contractions attenuate maximal eccentric exercise-induced muscle damage of the contralateral arm

2018 ◽  
Vol 21 (10) ◽  
pp. 1068-1072 ◽  
Author(s):  
Trevor C. Chen ◽  
Ming-Ju Lin ◽  
Jian-Han Lai ◽  
Hsin-Lian Chen ◽  
Hui-I Yu ◽  
...  
Keyword(s):  
Muscle Damage ◽  
Eccentric Exercise ◽  
Elbow Flexion ◽  
Eccentric Contractions ◽  
Low Intensity ◽  
Exercise Induced

scholarly journals Physiological and Neural Adaptations to Eccentric Exercise: Mechanisms and Considerations for Training

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Nosratollah Hedayatpour ◽  
Deborah Falla
Keyword(s):  
Muscle Damage ◽  
Motor Unit ◽  
Muscle Weakness ◽  
Eccentric Exercise ◽  
Muscle Function ◽  
Muscle Hypertrophy ◽  
Eccentric Contractions ◽  
Neural Adaptations ◽  
Neuromuscular Adaptations ◽  
Exercise Induced

Eccentric exercise is characterized by initial unfavorable effects such as subcellular muscle damage, pain, reduced fiber excitability, and initial muscle weakness. However, stretch combined with overload, as in eccentric contractions, is an effective stimulus for inducing physiological and neural adaptations to training. Eccentric exercise-induced adaptations include muscle hypertrophy, increased cortical activity, and changes in motor unit behavior, all of which contribute to improved muscle function. In this brief review, neuromuscular adaptations to different forms of exercise are reviewed, the positive training effects of eccentric exercise are presented, and the implications for training are considered.

Low-intensity eccentric contractions attenuate muscle damage induced by subsequent maximal eccentric exercise of the knee extensors in the elderly

2012 ◽  
Vol 113 (4) ◽  
pp. 1005-1015 ◽  
Author(s):  
Trevor C. Chen ◽  
Wei-Chin Tseng ◽  
Guan-Ling Huang ◽  
Hsin-Lian Chen ◽  
Kou-Wei Tseng ◽  
...  
Keyword(s):  
Muscle Damage ◽  
Eccentric Exercise ◽  
The Elderly ◽  
Eccentric Contractions ◽  
Knee Extensors ◽  
Low Intensity

Ultrasound Treatment and Recovery from Eccentric-Exercise-Induced Muscle Damage

2002 ◽  
Vol 11 (4) ◽  
pp. 305-314 ◽  
Author(s):  
Peter M. Tiidus ◽  
Joel Cort ◽  
Sarah J. Woodruff ◽  
Pamela Bryden
Keyword(s):  
Muscle Damage ◽  
Outcome Measures ◽  
Eccentric Exercise ◽  
Muscle Soreness ◽  
Peak Torque ◽  
Ultrasound Treatment ◽  
Eccentric Contractions ◽  
Random Assignment ◽  
Elbow Angle ◽  
Exercise Induced

Objectives:To evaluate ultrasound’s effectiveness after eccentric-exercise-induced muscle damage.Participants:22 subjects.Intervention:Random assignment to ultrasound (UT) or placebo (PT). Ultrasound was applied immediately and 24, 48, and 72 h after 50 maximum eccentric contractions of the biceps.Outcome Measures:Concentric and eccentric peak torques, resting elbow angle, and subjective muscle soreness were measured before and 24, 48, 72, and 96 h afterward.Results:No significant differences between UT and PT for biceps concentric or eccentric peak torque were noted. Both groups exhibited significant (P< .01) depression in eccentric and concentric peak torques with a slow return toward preexercise values over 96 h. Resting elbow angles for both groups were significantly lower than preexercise values up to 96 h (P< .01). Muscle soreness increased significantly (P< .05) at 24 and 48 h and returned to preexercise levels by 96 h.Conclusions:Daily ultrasound did not influence recovery after eccentric-exercise-induced muscle damage.

scholarly journals Two maximal isometric contractions attenuate the magnitude of eccentric exercise-induced muscle damage

2012 ◽  
Vol 37 (4) ◽  
pp. 680-689 ◽  
Author(s):  
Hsin-Lian Chen ◽  
Kazunori Nosaka ◽  
Alan J. Pearce ◽  
Trevor C. Chen
Keyword(s):  
Muscle Damage ◽  
Eccentric Exercise ◽  
Muscle Soreness ◽  
Muscle Length ◽  
Peak Torque ◽  
Eccentric Contractions ◽  
Control Group ◽  
Isometric Contractions ◽  
Elbow Flexors ◽  
Exercise Induced

This study investigated whether maximal voluntary isometric contractions (MVC-ISO) would attenuate the magnitude of eccentric exercise-induced muscle damage. Young untrained men were placed into one of the two experimental groups or one control group (n = 13 per group). Subjects in the experimental groups performed either two or 10 MVC-ISO of the elbow flexors at a long muscle length (20° flexion) 2 days prior to 30 maximal isokinetic eccentric contractions of the elbow flexors. Subjects in the control group performed the eccentric contractions without MVC-ISO. No significant changes in maximal voluntary concentric contraction peak torque, peak torque angle, range of motion, upper arm circumference, plasma creatine kinase (CK) activity and myoglobin concentration, muscle soreness, and ultrasound echo intensity were evident after MVC-ISO. Changes in the variables following eccentric contractions were smaller (P < 0.05) for the 2 MVC-ISO group (e.g., peak torque loss at 5 days after exercise, 23% ± 3%; peak CK activity, 1964 ± 452 IU·L–1; peak muscle soreness, 46 ± 4 mm) or the 10 MVC-ISO group (13% ± 3%, 877 ± 198 IU·L–1, 30 ± 4 mm) compared with the control (34% ± 4%, 6192 ± 1747 IU·L–1, 66 ± 5 mm). The 10 MVC-ISO group showed smaller (P < 0.05) changes in all variables following eccentric contractions compared with the 2 MVC-ISO group. Therefore, two MVC-ISO conferred potent protective effects against muscle damage, whereas greater protective effect was induced by 10 MVC-ISO, which can be used as a strategy to minimize muscle damage.

Striking muscle adaptations induced by volume-dependent repeated bouts of low-intensity eccentric exercise of the elbow flexors

2021 ◽  
Author(s):  
Trevor C. Chen ◽  
Wei-Chin Tseng ◽  
Hsin-Lian Chen ◽  
Kuo-Wei Tseng ◽  
Tai-Ying Chou ◽  
...  
Keyword(s):  
Muscle Strength ◽  
Muscle Damage ◽  
Eccentric Exercise ◽  
Voluntary Contraction ◽  
Eccentric Contractions ◽  
Control Group ◽  
Elbow Flexors ◽  
Muscle Adaptation ◽  
Low Intensity ◽  
Damage Protection

We investigated the effects of repeating 30 low-intensity eccentric contractions with a dumbbell corresponding to 10% maximal isometric strength (10%EC) on muscle strength and hypertrophy, and muscle damage after 30 maximal eccentric contractions of the elbow flexors (MaxEC). Young men were placed to one of three experimental groups that performed 10%EC either once, twice a week for four (eight bouts) or eight weeks (16 bouts) before MaxEC, or a control group that performed two bouts of MaxEC separated by two weeks (n=13/group). Repeating 16 bouts of 10%EC increased (P<0.05) maximal voluntary contraction strength (30±21%) and muscle thickness (4.2±2.3%) greater than eight bouts (16±4%, 1.9±1.3%). Changes in the muscle damage markers after MaxEC were smaller (P<0.05) for the experimental groups than the control group, and the magnitude of muscle damage protection was greater (P<0.05) after 16 (65±30%) than 8 bouts (55±33%), followed by one bout (34±27%). The protection by 16 bouts was similar (P=0.81) to that shown by the second MaxEC of the control group. These results showed that 10%EC produced potent muscle adaptation effects accumulatively and conferred muscle damage protection, but one bout of 10%EC was still effective for conferring approximately 20% of the protection of that by 16 bouts. Novelty bullets: ●Repeating low-intensity eccentric exercise induces large increases in muscle strength and hypertrophy. ●Low-intensity eccentric exercise protects muscle damage induced by maximal eccentric contractions, and the protection is reinforced by repeating it. ●These are especially beneficial for individuals who are frail and cannot tolerate high-intensity resistance training.

Sex differences in intracellular Ca2+ accumulation following eccentric contractions of rat skeletal muscle in vivo

2010 ◽  
Vol 299 (4) ◽  
pp. R1006-R1012 ◽  
Author(s):  
Takashi Sonobe ◽  
Tadakatsu Inagaki ◽  
Mizuki Sudo ◽  
David C. Poole ◽  
Yutaka Kano
Keyword(s):  
Skeletal Muscle ◽  
Muscle Damage ◽  
Eccentric Exercise ◽  
Muscle Length ◽  
Eccentric Contractions ◽  
Intermediate Response ◽  
The Difference ◽  
Exercise Induced ◽  
Resting Muscle

It is commonly believed that estrogen and sex influences play significant effects in skeletal muscle damage following eccentric exercise. The mechanistic bases for this sex-specific phenomenon remain to be resolved. The muscle damage has been linked to loss of Ca2+ homeostasis and resultant intramyocyte Ca2+ ([Ca2+]i) accumulation; therefore, we tested the hypothesis that the greater eccentric exercise-induced muscle damage in males would be associated with more pronounced [Ca2+]i accumulation. The intact spinotrapezius muscle of adult Wistar rats [male, female, and ovariectomized (OVX)—to investigate the effects of estrogen] was exteriorized. Tetanic eccentric contractions (100 Hz, 700-ms duration, 20 contractions/min for a total of 10 sets of 50 contractions) were elicited by electrical stimulation during synchronized muscle stretch of 10% resting muscle length. The fluorescence ratio (F340/F380 nm) was determined from images captured following each set of contractions, and fura-2 AM was used to estimate [Ca2+]i and changes thereof. Following eccentric contractions, [Ca2+]i increased significantly in male (42.8 ± 5.3%, P < 0.01) but not in female (9.4 ± 3.5%) rats. OVX evidenced an intermediate response (17.0 ± 1.2%) that remained significantly reduced compared with males. These results demonstrate that females maintain [Ca2+]i homeostasis following novel eccentric contractions, whereas males do not, which is consistent with a role for elevated [Ca2+]i in eccentric exercise-induced muscle damage. The presence of normal estrogen levels is not obligatory for the difference between the sexes.

scholarly journals Preconditioning by light-load eccentric exercise is equally effective as low-level laser therapy in attenuating exercise-induced muscle damage in collegiate men

2017 ◽  
Vol Volume 10 ◽  
pp. 2213-2221 ◽  
Author(s):  
Samar Nausheen ◽  
Jamal Ali Moiz ◽  
Shahid Raza ◽  
Mohammed Yakub Shareef ◽  
Shahnawaz Anwer ◽  
...  
Keyword(s):  
Muscle Damage ◽  
Laser Therapy ◽  
Eccentric Exercise ◽  
Low Level Laser Therapy ◽  
Low Level ◽  
Low Level Laser ◽  
Light Load ◽  
Level Laser ◽  
Exercise Induced

Eccentric exercise-induced muscle damage of pre-adolescent and adolescent boys in comparison to young men

2014 ◽  
Vol 114 (6) ◽  
pp. 1183-1195 ◽  
Author(s):  
Trevor C. Chen ◽  
Hsin-Lian Chen ◽  
Yi-Chuen Liu ◽  
Kazunori Nosaka
Keyword(s):  
Muscle Damage ◽  
Eccentric Exercise ◽  
Young Men ◽  
Adolescent Boys ◽  
Exercise Induced
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