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Training breathing muscles could have longer lasting benefits than previously thought

The strength gains to the muscles from five weeks of inspiratory muscle training (a form of weight training to strengthen the muscles used to breathe) persist for five weeks after the training has stopped.

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Training the breathing muscles (primarily the diaphragm which plays a vital role in breathing) could have longer lasting benefits than previously thought. The strength gains to the muscles from five weeks of inspiratory muscle training (a form of weight training to strengthen the muscles used to breathe) persist for five weeks after the training has stopped, according to new research published in Experimental Physiology.

Stronger breathing muscles may improve the distribution of blood flow during exercise, which allows a person to undergo physical activity for longer periods before tiring and becoming less breathless. Enhancing breathing muscle function can potentially help people manage and slow down the progression of chronic obstructive pulmonary disease (COPD), a group of lung conditions including emphysema and bronchitis. The disease is the third leading cause of death worldwide1 but is helped with pulmonary rehabilitation which can include inspiratory muscle training. Healthcare needs and the frequency of hospital visits depends on a person’s symptoms and how regularly they worsen. For people with weak breathing muscles, the training may help relieve the symptoms.

Muscles can lose function or weaken over time with disuse, particularly the respiratory muscles which may weaken faster than the other muscles in the body. The researchers from University of Waterloo, Canada foundthat the breathing muscles remain stronger after an equal amount of time without training, in this case five weeks. By observing similar muscle gains between weight training of the breathing muscles with that of the tibialis anterior (the muscle that runs down the front of the shin) indicates that the respiratory muscles can be trained like other skeletal muscles.  

Paolo Dominelli, University of Waterloo, Canada, a researcher on the study, said, “Inspiratory muscle training can be beneficial to people with breathing difficulties and can be part of pulmonary rehabilitation. Knowing the time frame before muscle function loss occurs could help inform treatment programs, determining how frequently an individual would need to train and the length of the programme.”

Inspiratory muscle training also caused a positive change to the respiratory muscle metaboreflex, a process where the body restricts the blood flow to the limbs when the breathing muscles tire. Typically during exercise when the limb muscles are working hard, the respiratory metaboreflex prioritises blood flow to the breathing muscles to ensure breathing is maintained. As a result, heart rate and blood pressure rise. However, inspiratory muscle training reduces the metaboreflex, which lowers the heart rate and blood pressure. Reducing the metaboreflex may improves a person’s endurance during exercise, meaning they can workout for longer before reaching exhaustion. The researchers found that the effects on the metaboreflex were preserved after five weeks in the absence of training.

Paolo Dominelli said, “By showing that the strength of the breathing muscles persisted, along with the retained reductions in the respiratory metaboreflex after five weeks without training suggests that the training itself may not need to be continuous. We would need to carry out subsequent clinical trails to test the appropriate frequency and length of training required to evaluate how long the health benefits persist.”

A group of 16 young healthy adults were randomly assigned into either the control group (seven male, one female) or the experimental group (six male, two female). Over 10-weeks their respiratory muscle strength and muscle strength of their lower leg (via the ability to flex the ankle upwards) were tested in a laboratory, and their blood pressure and heart rate were measured at pre-training (zero weeks), post-training (five weeks) and post-detraining (10 weeks) while their respiratory muscles were working hard to elicit the metaboreflex.

Over five weeks the experimental group performed inspiratory muscle training twice a day for five days a week. This was then followed by five weeks of undergoing normal physical activity but no inspiratory muscle training (post-detraining). The control group did not take part in inspiratory muscle training. All participants engaged in regularly physical activity (approximately three days per week) throughout the 10-week study period.

Paolo Dominelli cautions, “Firstly, our study was done in young healthy individuals who are not limited by their respiratory muscles. Follow-up studies needs to be completed in those with lung disease such as COPD. Secondly, the main limitation of the study was the duration of the detraining (no training) period. It was only for five weeks, the same amount of time as the training, where we did not see any decreases in breathing muscle strength. Further studies should extend the detraining phase to see if the reduction in the metaboreflex still persists with decreases in muscle strength.”

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Maintaining a healthy heart may require regular doses of positivity

The findings of this study further point to the importance of attending to mental and behavioral health for cardiovascular disease prevention and cardiovascular health optimization.

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Positive psychology interventions such as mindfulness, gratitude journaling and optimism training can consistently improve blood pressure, inflammation markers and other cardiovascular disease risk factors within a matter of weeks, a recent study found. However, since these benefits are associated with lifestyle changes such as eating healthier and greater physical activity, the researchers suggested that ongoing reinforcements may be needed to stay on course long term.

Rosalba (Rose) Hernandez, a professor of social work at the University of Illinois Urbana-Champaign, led a team that analyzed the findings of 18 randomized controlled trials that used positive psychological and mindfulness interventions to enhance mental or physical health.

The programs that the team reviewed included individual methods — such as structured telephone sessions, journaling with brief check-ins and digital platforms such as apps and text messaging — and interactive in-person group sessions, as well as hybrid formats that blended these with online tools and virtual meetings. Most of the programs consisted of weekly sessions and at-home activities that reinforced the skills taught, with the majority of programs lasting from six to 12 weeks, the team found.

In general, the programs included 50-200 adults with elevated cardiovascular risk factors such as uncontrolled hypertension, heart failure or other conditions. Typically, the participants were in their late 50s to mid-60s, and women comprised 35-55% of the samples across those studies that reported their participants’ gender, according to the researchers.

“In hypertension and postacute coronary syndrome cohorts, mindfulness-based programs delivered over an eight-week period reduced systolic blood pressure and lowered inflammatory markers such as high-sensitivity C-reactive protein and fibrinogen,” said Hernandez, who is a Fellow of the American Heart Association. “A 12-week spirituality-based digital intervention achieved one of the largest reductions — reducing systolic blood pressure measured with a standard cuff by 7.6 points, and central systolic pressure — which is measured in the aorta as it leaves the heart — by 4.1 points.”

In prior research on positive psychology interventions, scientists seldom defined the dose that was needed to obtain the beneficial effects, Hernandez said. She and the team members sought to clarify the frequency and duration that was most likely to improve individuals’ cardiovascular health.

Programs that had more frequent contact with their participants yielded the most consistent physiological benefits, underscoring the opportunity to embed positive psychological strategies into long-term cardiovascular care, Hernandez said.

The team found that the strongest behavioral improvements were achieved by an eight-week program delivered over WhatsApp that combined weekly sessions with daily microtasks, motivating participants to engage in greater physical activity, eat a healthier diet and take their medication as prescribed. A program that included motivational interviewing succeeded in increasing cardiac patients’ levels of physical activity by 1,800 steps a day and their medication adherence, while the mindfulness programs improved participants’ activity levels and diets only, according to the study.

“The therapeutic dose that was most consistently linked with improvements in blood pressure, inflammation and endothelial function was daily practice reinforced by weekly sessions over eight to 12-week periods,” Hernandez said. “Therapeutic dosing typically involved high-frequency dosing over this time period to obtain short-term physiologic benefits, while ongoing less-intensive contact may be needed to sustain behavioral change.”

Published in the journal Cardiology Clinics, the study was co-written by University of South Florida social work professor Soonhyung Kwon; Alyssa M. Vela, a professor of surgery and of psychiatry and behavioral sciences at Northwestern University Feinberg School of Medicine; and Katharine S. Edwards, a professor of cardiovascular medicine and of psychiatry and behavioral medicine at Stanford Medicine.

“The findings of this study further point to the importance of attending to mental and behavioral health for cardiovascular disease prevention and cardiovascular health optimization,” Vela said. “This speaks to the need for routine screening and integration of cardiac behavioral medicine to allow for access to important interventions.”

The current study adds to a growing body of research linking psychological well-being — including traits such as optimism, positive affect and gratitude — with cardioprotective benefits.

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Heart disease risk may start in the womb, study finds

Young adults whose mothers had high blood pressure during pregnancy — either pregnancy-associated hypertension, pre-eclampsia or eclampsia — had more signs of early arterial injury, higher blood pressure, higher body mass index and higher blood sugar than peers.

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A child’s future heart health may be partially shaped before they are born, reports a new Northwestern Medicine study that found pregnancy complications are linked to poorer cardiovascular health in offspring more than 20 years later.

The study found that young adults whose mothers had high blood pressure during pregnancy — either pregnancy-associated hypertension, pre-eclampsia or eclampsia — had more signs of early arterial injury, higher blood pressure, higher body mass index and higher blood sugar than peers.

The authors said the study adds to growing evidence that cardiovascular risk may be transmitted across generations through a combination of biological, environmental and behavioral factors.

“That means we must make sure people maintain good health from childhood into young adulthood, so that if or when someone becomes a parent, they pass on the best opportunity for good health to their children,” said study senior author Dr. Nilay Shah, assistant professor of medicine in the division of cardiology at Northwestern University Feinberg School of Medicine.

How the study was conducted

Shah and colleagues evaluated nearly 1,350 mother-child pairs from the Future of Families and Child Well-Being Study, which enrolled mothers and children at birth between 1998 and 2000 across 20 U.S. cities. The children were then followed into adulthood.

Using delivery hospitalization records, the Northwestern scientists first identified whether mothers experienced pregnancy complications, including high blood pressure during pregnancy, gestational diabetes (high blood sugar during pregnancy) or preterm birth (before 37 weeks of pregnancy).

The three pregnancy complications are on the rise, and affect almost one in four pregnancies in the U.S.

The research team then analyzed cardiovascular health of offspring at age 22, using blood pressure measurements, blood testing, body mass index assessments and carotid artery ultrasounds to look for signs of artery injury.

Finally, the scientists compared participants with and without exposure to each pregnancy complication and adjusted for factors like income, education, difference in birth weight and smoking during pregnancy.

Key findings

At around age 22, participants whose mothers had high blood pressure during pregnancy had:

  • Higher body mass index (+2.8 BMI points)
  • Higher diastolic blood pressure (+2.3 mm Hg)
  • Higher blood sugar levels (+0.2% HbA1c)
  • Thicker artery walls (~0.02 mm)

While the difference in artery wall thickness may seem small, the study authors said it corresponds to roughly three to five years of additional vascular aging. That means arteries looked older and less healthy than expected, which raises the risk of future heart disease.

Other pregnancy complications also showed some long-term effect:

  • Exposure to gestational diabetes was linked to worse blood pressure and some evidence of artery thickening
  • Being born preterm was associated with higher blood sugar levels

‘Most heart disease is preventable’

With pregnancy complications on the rise in the U.S., Shah said the study provides compelling evidence that improving health before and during pregnancy could help reduce heart disease risk in the next generation.

“There is evidence that both parents’ health at the time of conception and during pregnancy influences a child’s health,” he said. “So, promoting health from an early age, like exercising regularly, eating healthfully, never smoking and getting enough sleep, is not just meant for an individual, but doing so may help future generations be healthier, too.”

Shah also emphasizes that risk is not destiny.

“The good news is that most heart disease is preventable,” he said. “If you experienced high blood pressure or high blood sugar during pregnancy, or your child was born early, it does not absolutely mean that your child will have worse health as adults. But I would encourage you to pay attention now to your child’s health behaviors.

“What children learn in childhood sets the stage for their health across their lives. If you are wondering whether your children’s behaviors are healthy, or are considering making a change, please speak with your child’s pediatrician for advice and guidance.”

Other Northwestern co-authors include Emily Lam, Abigail Gauen, Dr. Sadiya Khan, Alexa Freedman and Norrina Allen.

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Viagra could hold key to halting Peyronie’s disease

Combining two widely prescribed drug classes could provide the first effective treatment for early-stage Peyronie’s disease.

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Combining two widely prescribed drug classes could provide the first effective treatment for early-stage Peyronie’s disease, according to a study published in The Journal of Sexual Medicine.

Peyronie’s disease (PD) is caused by the development of fibrotic scar tissue within the penis, leading to pain, curvature, sexual dysfunction and, in many cases, significant psychological distress. It affects an estimated 10 per cent of men during their lifetime, but despite its prevalence, treatment options are limited, particularly in the early phase of the condition.

The study, carried out by Anglia Ruskin University (ARU) and University College London Hospital (UCLH), found that combining phosphodiesterase type 5 (PDE5) inhibitors such as sildenafil (Viagra) and tadalafil (Cialis) with selective oestrogen receptor modulators (SERMs), including tamoxifen, may slow or even stop disease progression when given early.

The clinical study, carried out by Professor David Ralph of UCLH, evaluated outcomes in 133 men diagnosed with acute Peyronie’s disease who were treated with the drug combination for three months. Their results were compared with a smaller group of patients receiving standard care, which included giving vitamin E or no treatment at all. Standard care did not include surgery.

The study found 43 per cent of patients on the combination experienced an improvement in penile curvature, almost three times higher than in the standard‑care group (15 per cent).

At the start of treatment, 65 per cent of patients in the combination group reported pain during erections. After three months, that figure had fallen to just 1.5 per cent. By comparison, pain prevalence in the standard‑care group fell from 50 per cent to 27 per cent.

The clinical findings build on earlier laboratory work led by Professor Selim Cellek at ARU’s Fibrosis Research Group. Over the course of several years, Professor Cellek’s team screened 1,953 FDA‑approved drugs to identify compounds capable of blocking the transformation of fibroblasts into myofibroblasts, the key cells responsible for fibrosis. PDE5 inhibitors and SERMs emerged as particularly effective, and when used together demonstrated an effect greater than either drug alone.

Currently, there are no approved oral therapies proven to prevent early disease progression, forcing patients in the acute phase to wait until the condition stabilises before they can be offered treatments including injections or surgery.

Professor Cellek said: “Positive findings from this pilot clinical study validate our drug‑screening approach in the lab. It shows how repurposing well‑known medicines can accelerate progress in areas of unmet clinical need.

“Because both PDE5 inhibitors and SERMs are already widely used in clinical practice and have established safety profiles, the approach could be readily adoptable if confirmed in larger studies.

“These results suggest that early intervention targeting fibrosis could change how we treat Peyronie’s disease. Repurposing existing drugs may allow us to move from managing symptoms to modifying the disease itself.”

Professor David Ralph, Professor of Urology at UCLH, said: “This paper confirms the basic science research with regards to halting the progression of Peyronie’s disease. In previous papers we have noted that tamoxifen and PDE5 inhibitors inhibit the transformation of fibroblasts into myofibroblasts and therefore contraction of the plaque.

“This has now been put into clinical practice where this paper shows that when tamoxifen and a PDE5 inhibitor are combined, there is statistically less progression of the disease and improvement in curvature compared to the control arm. This is where from bench to clinical practice prevails and hopefully now a prospective clinical trial can be initiated.”

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