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Exercise can be Bad?

Posted on January 10, 2013 | No Comments on Exercise can be Bad?

A recent study suggested the use of personalized exercise programs, as it found out that at least a seven percent minority minority may have increased heart and diabetic risk factors from regular exercise.

Together with his colleagues, lead researcher Claude Bouchard, genetics and nutrition professor at Pennington Biomedical Research Center, USA, noted that public health guidelines suggest adults must do 150 minutes of moderate physical activities weekly, or 75 minutes of vigorous activities.

They also pointed out, however, that different people respond differently to exercise depending on cardio respiratory fitness, cardiometabolic and diabetes risk factors.

They analyzed six meticulous studies that looked at the effect of exercise in 1,687 adults. The said studies were the HERITAGE Family Study, the DREW Study, the INFLAME Study, and the STRRIDE Study, and Iwo cohorts from studies of the University of Maryland and the University of Jyvaskyla.

They examined how many of the participants had an adverse response to exercise, which they defined as “exercise-induced change that worsens risk factor beyond measurement error and expected day-to-day variation”.

Moreover, the researchers produced their own parameters for the said definition through measuring resting systolic blood pressure (SBP), fasting plasma HDL-cholesterol (HDL-C), triglycerides (TG) and insulin (FI) in over 60 people in three weeks.

Bouchard and his colleagues defined the following measures adverse response in these risk factors as: an additional 10 mm Hg or more for SR 0.42 mmol/L or more for TG, or 24 pmol/L or more for Fl or a decrease of 0.12 mmol/L or more for HDL-C.

Based on the results of the six studies, 8.4 percent of participants had an adverse change in Fl. The figure was 12.2 percent for SBP 10.4 percent for TG and 13.3 percent for HDL-C. Moreover, the proportion of participants who had adverse effects in two or more risk factors was 7 percent. Researchers noted that this subgroup must receive urgent attention.

Meanwhile, the researchers found no evidence for differences between gender and nationality. It was also pointed out that the adverse response wasere not explained by the health status of the participants, their age, amount of exercise they did, even the lack of improvement in cardio respiratory fitness. Also, there was no evidence that suggest drugs caused adverse responses.

The authors said that the adverse responses to regular exercise in cardiovascular and diabetes risk factors occur. Thus, identifying the predictors of such responses and the necessary prevention will provide them the foundation for personalized exercise prescription.

They added, “The challenge now is to investigate whether the baseline predictors of adverse responses can be identified to screen individuals so they can be offered alternative approaches to modifying cardiometabolic risk factors.”

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