Research by Sen et al. presented at the 100th annual meeting of the Endocrine Society has shown that the low-calorie sweetener sucralose can have adverse health effects. Sucralose was found to promote more fat deposits within cells. It may cause this by increasing the transport of glucose into cells and overexpressing fat-producing genes. Another potential mechanism may be the promotion of oxygen radicals. These extremely reactive particles cause inflammation and facilitate the accumulation of fat within cells.
The researchers comment that these effects are “more pronounced in overweight and obese people rather than their normal weight counterparts because they have more insulin resistance and may have more glucose in their blood“.
A few months ago Terenteva et al. published their research findings on the effect of acupuncture in a group of middle-aged individuals with hypertension. Forty five adults with hypertension were randomly assigned to either an acupuncture group or a control group. The acupuncture group received 3 sessions of acupuncture per week for 8 weeks. The following points were needled bilaterally for 20 mins: St36, St37, Pc5, Pc6, Liv3, Sp4, and LI11.
The researchers found that acupuncture “resulted in beneficial reductions of aortic hemodynamics and arterial stiffness”. “Acupuncture decreased brachial systolic blood pressure (SBP) and diastolic blood pressure (DBP) by approximately 10 and 6 mmHg, respectively.” It also reduced aortic SBP by 10 mmHg. Although these effects seem small, they can decrease cardiovascular risk by over 30%.
The mechanisms behind the effects are thought to come from an increase in secretion of vasodilators (nitric oxide) and a decrease in secretion of vasoconstrictors (endothelin-1, angiotensin II). Modulation of the autonomic nervous system by decreasing sympathetic activity may also play a part.
Intermittent fasting (IF) is proven to have beneficial effects on aging, cancer, cardiovascular diseases and neurodegenerative diseases. However, it isn’t known whether the benefits of IF are due to caloric restriction (CR), as with fasting, or whether they’re due to changes in eating pattern. Recent studies have discovered that the browning of white fat can improve insulin sensitivity and energy expenditure by producing heat. Both exercise and cold exposure have been shown to transform white fat into brown fat.
A recent study by Kim et al. from the University of Toronto looked into the mechanisms underlying intermittent fasting’s effects on health. They separated mice into 2 groups: an IF group and a control group. The IF group was not fed for 1 day and then fed for 2 days in a row whereas the control group was fed daily. This went on for 4 months. By the end of the study, both groups had been fed the same amount of calories. After 4 months, the IF mice weighed significantly less and had increased insulin sensitivity and a more stable glucose metabolism. Additionally, they had a lower proportion of white fat because it had been converted into brown fat. The IF mice had higher levels of adipose vascular endothelial growth factor (VEGF). VEGF helps form new blood vessels and activates adipose macrophages (white blood cells) which are critical for the browning of white fat and heat production. Interestingly, IF led to the browning of visceral white fat while cold exposure leads to the browning of subcutaneous white fat.
The authors note that health is not solely about “what and how much” we eat but also “when and how often”.
Earlier this year Ural et al, from Yildirim Beyazit University Medical School in Ankara, studied the effects of acupuncture on patients with lateral epicondylitis/epicondylopathy (LE). Lateral epicondylitis or tennis elbow, as it’s more commonly known, is an overuse injury that leads to pain on the lateral aspect of the elbow and/or forearm. It usually affects people aged 40 or over. Treatment can include rest, NSAIDS, bracing, physiotherapy, shockwave therapy, steroid injections, platelet-rich plasma injections, Botox injections or surgery.
Diagnostic ultrasound of the common extensor tendon (CET) in people with LE can reveal oedema, bone irregularities and increased CET thickness. Common extensor tendon thickness provides information on the severity and progress of LE.
The authors randomly split 41 patients with LE into 2 groups. The control group was advised to rest and prescribed NSAIDS, exercise and bracing. The acupuncture group received the same intervention as the control group but with acupuncture in addition. The patients were offered 10 sessions (25 min each) of acupuncture over a period of 4 weeks. Six acupoints (LI4, LI10, LI11, Lu5, SJ5 and one Ah Shi point) were used and the needles were inserted into muscle and stimulated manually to achieve deqi (needling sensation). The assessments prior to and following the course of treatment consisted of a subjective pain evaluation, pressure pain threshold testing, a function questionnaire (Duruoz Hand Index) and an ultrasound evaluation of CET thickness.
Results showed that pain and function scores improved in both groups. Whereas pain pressure thresholds and CET thickness decreased in the acupuncture group only. Improvements in pain, function, pain pressure threshold and CET thickness were significantly higher in the acupuncture group.
The authors conclude that “acupuncture treatment not only reduces pain but improves the tendon morphology in LE patients.”
Helene Langevin is a professor at Harvard Medical School and at The University of Vermont College of Medicine. She is also the director for the Osher Center for Integrative Medicine. Her lab has conducted a lot of interesting research on connective tissue. I’ve summarised some of the findings that relate to the effects of stretching on connective tissue (fascia).
Studies from her lab have shown that stretching had beneficial effects on chronic inflammation in rats. They noted increases in stride length, decreased pain and decreased macrophages (inflammatory cells). Both active and passive stretching were effective and had an effect on acute and chronic phases of inflammation. Stretching decreases pro-inflammatory mediators and increases pro-resolving mediators such as Resolvin, which is synthesised from omega-3 fatty acids.
A thicker thoracolumbar fascia has been identified in some people with low back pain. And the decreased mobility of the fascial layers is thought to stem from adhesions between the layers. Stretching can decrease connective tissue adhesions (fibrosis) by decreasing collagen formation.
Additionally, links have been found between chronic inflammation, fibrosis and cancer. In summary, stretching can have beneficial effects on inflammation, pain, function and even the predisposition to certain types of cancer!
A few months ago Ural et al, from Yildirim Beyazit University Medical School in Ankara, published an interesting paper looking into the effects of acupuncture on carpal tunnel syndrome (CTS). Their work was published in Evidence-Based Complementary and Alternative Medicine.
CTS affects more women than men and has a prevalence of 1-5%. Causes include overuse of the hand, diabetes, rheumatoid arthritis, hypothyroidism and pregnancy. Symptoms can include pain numbness and tingling of the first 3-4 fingers, as well as weakness and wasting of the hand muscles supplied by the median nerve. Some of the commonly used treatments are rest, non-steroidal anti-inflammatory drugs, splinting, steroid inject injections, vitamin B6 supplementation, physiotherapy and eventually surgery. The cross-sectional area (CSA) of the median nerve has been found to increase in association with the severity of CTS. In fact, this increase in CSA is so reliable that it can be used to diagnose CTS or predict the need for surgery.
Ural et al recruited 27 female patients with mild to moderate CTS. On average, their symptoms had lasted about 1.5 years. They were randomised into an acupuncture group and a control group. Both groups wore a night wrist splint for 4 weeks. In addition to the night splint, the acupuncture group received 10 sessions of acupuncture over 4 weeks. Nine acupuncture points were used and the needles were retained for 25 minutes. Evaluations of hand function (DHI and DASH) and pain (VAS), electrophysiological tests and ultrasound measurements of CSA were taken before and after treatment.
The results showed that symptom severity, hand function and electromyographic measurements improved in both groups but improvements were significantly greater in the acupuncture group. In the acupuncture group, pain decreased by just under 50% (from 9/10 to less than 5/10), and hand function measurements improved by 15-22%. These are impressive results when we consider that they took place over a month and that patients had been symptomatic for 1.5 years prior to that. CSA of the median nerve was unchanged in the control group but significantly reduced in the acupuncture group (8% reduction). The authors believe that this is the first time the effect of acupuncture on median nerve CSA in patients with CTS has been demonstrated.
Ural et al conclude that “acupuncture improves not only clinical and electrophysiological findings but also morphological features in patients with CTS”, however “the relationship between change of CSA and electrophysiological changes was not correlated. The small sample size of our study may cause this result”. They suggest confirming the results in future studies with larger sample and long-term monitoring.
Last month Groessl et al., from the San Diego School of Medicine, published the results of their study examining the benefits of yoga on military veterans with chronic low back pain. Of the 150 participants in the study, 35% were unemployed or disabled and the mean back pain duration was 15 years. The mean age was 53 years. The group was generally thought to have “fewer resources, worse health, and more challenges attending yoga sessions than community samples studied previously”.
Hatha yoga classes, designed specifically for people with low back pain, were held twice a week for 12 weeks. They were led by an experienced certified instructor. Home practice (15-20 mins/day) was encouraged. The classes consisted of yoga postures, movement sequences, breathing exercises and brief meditation.
The veterans that completed the study had less disability and less pain. Although the decreases in pain were small, they happened in spite of reduced opioid use.
Yu et al recently published the results their study on the effects of acceptance and commitment therapy (ACT) in people with chronic pain. The article appeared in last month’s issue of Journal of Pain. ACT “is an empirically-based psychological intervention that uses acceptance and mindfulness strategies mixed in different ways with commitment and behavior-change strategies, to increase psychological flexibility. The objective of ACT is not elimination of difficult feelings; rather, it is to be present with what life brings us and to “move toward valued behavior”. Acceptance and commitment therapy invites people to open up to unpleasant feelings, and learn not to overreact to them, and not avoiding situations where they are invoked” (Wikipedia).
The study involved over 400 hundred adults referred to a pain management clinic. Treatment significantly improved pain acceptance, pain-related interference, work and social adjustment and depression. This was true immediately post-treatment as well as at a 9-month follow-up. ACT also changed something known as “self-as-context” (SAC). SAC can be described as “the you that is always there observing and experiencing and yet distinct from one’s thoughts, feelings, sensations, and memories” (Wikipedia). Of note was the fact that positive changes in “self-as-context” were associated with positive changes in outcomes.
It’s really interesting how acceptance and commitment therapy has incorporated Buddhist principles and techniques such as mindfulness, acceptance and the self. In fact, it seems that the use of Buddhist philosophy and principles are becoming more common within therapy nowadays.
A study by Whitlock et al from the University of California, published in this month’s Jama Internal Medicine, looked into the relationship between persistent pain, memory decline and dementia. Over 10,000 senior citizens (median age of 73 years) from the Health and Retirement Study were followed for 12 years.
At baseline, persistent pain affected 11% of participants and was linked with more restrictions in daily activities and more symptoms of depression. Those with persistent pain had a greater risk (9%) of having a more rapid memory decline than those without pain. They also had a smaller increase in risk (2%) of developing dementia. These changes significantly increased the chances of being unable to manage medications (16%) or finances (12%).
What’s the causal connection between chronic pain, memory decline and dementia? The authors believe the severity of pain can decrease attention capacity and impair memory consolidation. Additionally, pain leads to stress, and stress has been shown to promote cognitive decline, mainly through hypotrophy of the hippocampus. In my opinion, the disruption of sleep can also contribute to poor memory and a decline in cognitive ability because, as we know, sleep is involved in memory processing and consolidation.
Fortunately, physiotherapy, rehabilitation, relaxation and mindfulness meditation are effective at addressing chronic pain.
This month a fascinating report was published in Annals of the Rheumatic Diseases. It was a collaborative study between Tufts University (Boston) and the University of Manchester. Dai et al looked into the link between dietary fibre and knee osteoarthritis (OA). They used data from the Osteoarthritis Initiative (4796 participants) and the Framingham Offspring Osteoarthritis Study (1268 participants). The first group was followed for 4 years and the second group was reassessed after 9 years. The findings consistently showed that higher total fibre intake was related to a lower risk of symptoms of knee osteoarthritis (pain, stiffness, and swelling). It was unclear whether fibre had an effect on the result of knee x-rays.
The authors note that “there is increasing evidence suggesting that OA shares similar metabolic characteristics including obesity, dyslipidaemia and inflammation with cardiovascular diseases and diabetes”. Clinical trials have already shown the beneficial effect of dietary fibre on reducing body weight, blood pressure, blood sugar and in reducing circulating C reactive protein (a marker of inflammation). Increasing our intake of fibre can help improve musculoskeletal problems in addition to bettering our overall health. Fibre can be found in cereal grains, fruits, vegetables, nuts and legumes.