A tennis lesson: sharp practice in the science behind the Sharapova case

Maria Sharapova (and hundreds of other elite athletes) took meldonium, a drug developed at the time of the USSR for the treatment of heart attack and stroke, though it has never been approved for use anywhere outside of the former Soviet Union. Meldonium is an inhibitor of -butyrobetaine hydroxylase, an enzyme involved in the carnitine biosynthetic pathway.1 Intake results in a reduction of tissue carnitine content, including the heart and skeletal muscles. Carnitine plays a critical role in transferring long-chain fatty acids across mitochondrial inner membrane into the mitochondrial matrix, to enable entry of the fatty acid moiety into the oxidation pathway, to synthesise ATP aerobically.2 In cases when intracellular carnitine availability is compromised, such as in neonatal primary carnitine deficiency,3 those affected experience hypoglycaemia, fatigue, seizures and cardiomyopathy.3 Carnitine-deficient individuals are sensitive to prodrugs containing the pivaloyl moiety, as pivalic acid...

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Evaluation of low-level laser therapy on skeletal muscle ischemia–reperfusion in streptozotocin-induced diabetic rats by assaying biochemical markers and histological changes

Abstract

The purpose of the present study was to assess the effects of low-level laser therapy (LLLT) on skeletal muscle ischemia–reperfusion (IR) injuries in streptozotocin-induced diabetic rats. Twenty male Wistar rats were randomly assigned into two experimental groups, as follows: the diabetic IR group (G1, n = 10) and the diabetic IR + LLLT group (G2, n = 10). Ischemia was induced in anesthetized rats from the right femoral artery clipping for 2 h, followed by a reperfusion for 24 h. Then, the laser irradiation (K30 handheld probe, AZOR, Technica, Russia, 650 nm, 30 mW, surface area = 1 cm², energy density = 1.8 J/cm²) was carried out by irradiating the rats over a unique point on the skin over the middle region of the right gastrocnemius muscle belly three times (every 8 h), starting after initiating the reperfusion for 3 min. At the end of the reperfusion period, rats were anaesthetized and blood samples were collected and used for the estimation of pO₂, pCO₂, pH, HCO₃, serum creatine phosphokinase (CPK), and lactate dehydrogenase (LDH). Subsequently, the right gastrocnemius muscle samples were taken for wet/dry weight ratio assessment and histological/biochemical examination. The pO₂, pCO₂, HCO₃, and pH levels were similar for both groups (P > 0.05). The serum LDH and CPK levels were significantly lower (P < 0.05) for G2 compared to G1. In comparison to G1, tissue malondialdehyde level in G2 was significantly decreased (P < 0.05). In G2, superoxide dismutase activity was significantly increased compared to G1 (P < 0.05). Unlike G2, a significant decrease in the activity of catalase was observed in G1 (P < 0.05). The wet/dry ratio in G1 was significantly higher than that of G2 (P < 0.05). Histological examination confirmed that the extent of muscle changes in G1 was higher than G2 (P < 0.05). Finally, according to this study, LLLT has a beneficial effect on the IR muscle injury treatment in the diabetic rats. Therefore, we suggest that further research needs to be conducted using different laser parameters and examining response over a longer period of tissue recovery.

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Acute effects of low-level laser therapy irradiation on blood lactate and muscle fatigue perception in hospitalized patients with heart failure—a pilot study

Abstract

The objective of the present study is to evaluate the acute effects of low-level laser therapy (LLLT) on functional capacity, perceived exertion, and blood lactate in hospitalized patients with heart failure (HF). Patients diagnosed with systolic HF (left ventricular ejection fraction <45 %) were randomized and allocated prospectively into two groups: placebo LLLT group (n = 10)—subjects who were submitted to placebo laser and active LLLT group (n = 10)—subjects who were submitted to active laser. The 6-min walk test (6MWT) was performed, and blood lactate was determined at rest (before LLLT application and 6MWT), immediately after the exercise test (time 0) and recovery (3, 6, and 30 min). A multi-diode LLLT cluster probe (DMC, São Carlos, Brazil) was used. Both groups increased 6MWT distance after active or placebo LLLT application compared to baseline values (p = 0.03 and p = 0.01, respectively); however, no difference was observed during intergroup comparison. The active LLLT group showed a significant reduction in the perceived exertion Borg (PEB) scale compared to the placebo LLLT group (p = 0.006). In addition, the group that received active LLLT showed no statistically significant difference for the blood lactate level through the times analyzed. The placebo LLLT group demonstrated a significant increase in blood lactate between the rest and recovery phase (p < 0.05). Acute effects of LLLT irradiation on skeletal musculature were not able to improve the functional capacity of hospitalized patients with HF, although it may favorably modulate blood lactate metabolism and reduce perceived muscle fatigue.

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Low level laser therapy associated with a strength training program on muscle performance in elderly women: a randomized double blind control study

Abstract

The aging process leads to a gradual loss of muscle mass and muscle performance, leading to a higher functional dependence. Within this context, many studies have demonstrated the benefits of a combination of physical exercise and low level laser therapy (LLLT) as an intervention that enhances muscle performance in young people and athletes. The aim of this study was to evaluate the effects of combination of LLLT and strength training on muscle performance in elderly women. For this, a hundred elderly women were screened, and 48 met all inclusion criteria to participate in this double-blind placebo-controlled trial. Volunteers were divided in three groups: control (CG = 15), strength training associated with placebo LLLT (TG = 17), and strength training associated with active LLLT (808 nm, 100 mW, 7 J) (TLG = 16). The strength training consisted of knee flexion-extension performed with 80 % of 1-repetition maximum (1-RM) during 8 weeks. Several outcomes related to muscle performance were analyzed through the 6-min walk test (6-MWT), isokinetic dynamometry, surface electromyography (SEMG), lactate concentration, and 1-RM. The results revealed that a higher work (p = 0.0162), peak torque (p = 0.0309), and power (p = 0.0223) were observed in TLG compared to CG. Furthermore, both trained groups increased the 1-RM load (TG vs CG: p = 0.0067 and TLG vs CG: p < 0.0001) and decreased the lactate concentration in the third minute after isokinetic protocol (CG vs TLG: p = 0.0289 and CG vs TG: p = 0.0085). No difference in 6-MWT and in fatigue levels were observed among the groups. The present findings suggested that LLLT in combination with strength training was able to improve muscle performance in elderly people.

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Improved Butanol–Methanol (BUME) Method by Replacing Acetic Acid for Lipid Extraction of Biological Samples

Abstract

Extraction of lipids from biological samples is a critical step in lipidomics, especially for shotgun lipidomics where lipid extracts are directly infused into a mass spectrometer. The butanol–methanol (BUME) extraction method was originally developed to extract lipids from plasma samples with 1 % acetic acid. Considering some lipids are sensitive to acidic environments, we modified this protocol by replacing acetic acid with lithium chloride solution and extended the modified extraction to tissue samples. Although no significant reduction of plasmalogen levels in the acidic BUME extracts of rat heart samples was found, the modified method was established to extract various tissue samples, including rat liver, heart, and plasma. Essentially identical profiles of the majority of lipid classes were obtained from the extracts of the modified BUME and traditional Bligh–Dyer methods. However, it was found that neither the original, nor the modified BUME method was suitable for 4-hydroxyalkenal species measurement in biological samples.

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Role of Environmental Factors on Resuming Valued Activities Poststroke: A Systematic Review of Qualitative and Quantitative Findings

Publication date: June 2016
Source:Archives of Physical Medicine and Rehabilitation, Volume 97, Issue 6
Author(s): Sandra Jellema, Rob van der Sande, Suzanne van Hees, Jana Zajec, Esther M. Steultjens, Maria W. Nijhuis-van der Sanden
ObjectiveTo investigate how reengagement in valued activities poststroke is influenced by environmental factors.Data SourcesPubMed, CINAHL, and PsycINFO were searched to June 2015 using multiple search terms for stroke, activities, disability, and home and community environments, with the following constraints: English, humans, and adults.Study SelectionStudies were included that contained data on how reengagement in valued activities of community-dwelling stroke survivors was influenced by the environment. Two reviewers independently selected the studies. The search yielded 3726 records; 39 studies were eventually included.Data ExtractionFindings were extracted from qualitative, quantitative, and mixed-design studies. Two reviewers independently assessed study quality using the Oxford Critical Appraisal Skills Programme lists and independently extracted results.Data SynthesisThematic analysis was conducted on qualitative data, revealing 9 themes related to the iterative nature of the process of reengagement and the associated environmental factors. During the process of reengagement, environmental factors interact with personal and disease-related factors in a gradual process of shaping or abandoning valued activities. The sociocultural context in this case determines what activities are valued and can be resumed by stroke survivors. Social support; activity opportunities and obligations; familiar and accessible environments; resources and reminders; and a step-by-step return facilitate stroke survivors to explore, adapt, resume, and maintain their activities. Social support is helpful at all stages of the process and particularly is important in case stroke survivors are fearful to explore their activity possibilities. The quantitative data identified largely endorsed these findings. No quantitative data were found in respect to the iterative nature of the process, familiar environments, or accessibility.ConclusionsReengagement in valued activities is a gradual process. In each stage of the process, several environmental factors play a role. During rehabilitation, professionals should pay attention to the role physical and social environmental factors have in reengagement poststroke and find ways to optimize stroke survivors' environments.



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Molecular Imaging of Small Animals

This article reviews Molecular Imaging of Small Animals by H. Zaidi

 

Instrumentation and Applications. Editor: . , Heidelberg, NY, 2014. 760 pp. Price: $239.00. ISBN: 978-1-4939-0893-6 (hardcover).

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