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Physiology International
Authors:
Mouadh Hiraoui
,
Nabil Gmada
,
Badria Al-Hadabi
,
Amel Mezlini
,
Majid Al Busafi
,
Pierre Louis Doutrellot
,
Ezdine Bouhlel
, and
Said Ahmaidi

, inducing in particular muscle fatigue and respiratory disorders [ 7 ]. Moreover, the lack of physical activity during cancer treatment, prolonged bed rest and treatment with high-dose corticoids can aggravate the decline of muscular function by a

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Low-intensity resistance exercise with blood flow restriction (BFR) has been shown to induce a prominent increase in muscle activation in response to muscle fatigue. However, the magnitude of muscle fatigue between continuous (Con-BFR) and intermittent BFR (Int-BFR, BFR only during exercise) is currently unknown. We examined the effect of Con-BFR or Int-BFR on muscle activation during exercise. Unilateral arm curl exercise (20% of one-repetition maximum, four sets, 30 sec rest period between sets) was performed without (CON) or with Con-BFR or Int-BFR. During BFR conditions, the cuff was inflated to 160 mmHg on the proximal region of testing arm. Surface electromyography (EMG) was recorded from the biceps brachii muscle, and integrated EMG (iEMG) was analyzed. During the exercise, iEMG increased progressively in Con-BFR and Int-BFR and both conditions were greater (p < 0.05) than CON at the 3rd and 4th set. However, there were no differences (p > 0.05) in iEMG between Con-BFR and Int-BFR during exercise (∼2.45 and ∼2.40 times, respectively). Thus, the magnitude of increase in muscle activation may be similar between Con-BFR and Int-BFR when BFR exercise was performed at a high level of cuff pressure intensity.

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, 10 , 19 ). This aspect of muscle fatigue is termed as non-local muscle fatigue (NLMF). Although it is unclear what exactly leads to NLMF, some investigators have proposed that feedback by group III/IV muscle afferents originating in the exercised

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The main target of this study was to measure the influence of sumac juice drink on muscle indices and pain during an acute, intense exercise for 30 days. Forty healthy volunteers (15–25 years) were involved in aerobic exercise program for 4 weeks. Participants ingested sumac juice or placebo drink twice daily for 30 days. All participants were subjected for the evaluation of pain and estimation of serum: creatine kinase (CK), lactic acid dehydrogenase (LDH), troponin I, hydroxyproline (hyp), total antioxidant capacity (TAC), and in vitro antioxidant activity of sumac juice using pre-validated visual analog scale, colorimetric and immunoassays. The participants of both groups, placebo and sumac, showed an increment in pain scores both during exercise and post-exercise intervals. However, the sumac juice group showed a significant smaller increase in the pain scores compared to the placebo group. Participants in the sumac juice group were more willing to use the drink in the future. They achieved a higher satisfaction of sumac juice in ameliorating and the reduction of pain. Also, the sumac group showed a significant enhancement in the level of CK, LDH, troponin I, hyp, along with significant increase in serum (TAC) compared to the placebo group. The protective activity of muscle may relate to the antioxidant activity of phenolic component(s) in sumac juice as measured by 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging (87.9%) and β-carotene–linoleic acid (68.7%) assays. These data suggest that oral administration of sumac juice may have a beneficial effect on muscle performance among athletes.

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1989 Mechanical influences on long-lasting human muscle fatigue and delayed-onset pain J Physiol 412 415 427 . 4

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Scapuladyskinesis: a vállelváltozások origója?

Scapular dyskinesis: the origo of shoulder lesions?

Orvosi Hetilap
Authors:
Dominik Norbert Kovács
,
Márton Moldoványi
,
Veronika Varga
,
Márta Hock
, and
Eleonóra Leidecker

subjects with and without shoulder impingement. J Orthop Sports Phys Ther. 1999; 29: 574–586. 20 Tsai NT, McClure PW, Karduna AR. Effects of muscle

Open access

. This denoted the same relative, but different absolute intensities for the participants. It was assumed that larger exercise loads would increase muscle fatiguability and accordingly would result in larger changes in force or velocity (or both). We

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. S. , Jeon , H. W. , & Lee , C. R. ( 2012 ). Effects of the use of smartphones on pain and muscle fatigue in the upper extremity . Journal of Physical Therapy Science, 24 ( 12 ), 1255 – 1258 . doi

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. Mador MJ , Acevedo FA : Effect of inspiratory muscle fatigue on breathing pattern during inspiratory resistive loading . J. Appl

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explained to each participant by trained practitioners (Table  I ). Thereby, during exercise testing, overall perception of muscle fatigue (RPE) and physical stress was assessed. RPE is considered as a valid method to quantify training in response to high

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