R and omized controlled trials found a positive correlation for SB with BMI , neck circumference , fat mass , HbA1C , cholesterol and insulin levels , cohort studies additionally for WC , leptin , C-peptide , ApoA1 and Low density lipoprotein and a negative correlation for HDL .
Most studied biomarkers associated with SB were of cardiovascular or metabolic origin .
OBJECTIVE Pathomechanisms of sedentary behaviour ( SB ) are unclear .
We conducted a systematic review to investigate the associations between SB and various biomarkers in older adults .
Minimal Intensity Physical Activity (Standing and Walking) of Longer Duration Improves Insulin Action and Plasma Lipids More than Shorter Periods of Moderate to Vigorous Exercise (Cycling) in Sedentary Subjects When Energy Expenditure Is Comparable
Background Epidemiological studies suggest that excessive sitting time is associated with increased health risk , independent of the performance of exercise . We hypothesized that a daily bout of exercise can not compensate the negative effects of inactivity during the rest of the day on insulin sensitivity and plasma lipids . Methodology /Principal Findings Eighteen healthy subjects , age 21±2 year , BMI 22.6±2.6 kgm−2 followed r and omly three physical activity regimes for four days . Participants were instructed to sit 14 hr/day ( sitting regime ) ; to sit 13 hr/day and to substitute 1 hr of sitting with vigorous exercise 1 hr ( exercise regime ) ; to substitute 6 hrs sitting with 4 hr walking and 2 hr st and ing ( minimal intensity physical activity ( PA ) regime ) . The sitting and exercise regime had comparable numbers of sitting hours ; the exercise and minimal intensity PA regime had the same daily energy expenditure . PA was assessed continuously by an activity monitor ( ActivPAL ) and a diary . Measurements of insulin sensitivity ( oral glucose tolerance test , OGTT ) and plasma lipids were performed in the fasting state , the morning after the 4 days of each regime . In the sitting regime , daily energy expenditure was about 500 kcal lower than in both other regimes . Area under the curve for insulin during OGTT was significantly lower after the minimal intensity PA regime compared to both sitting and exercise regimes 6727.3±4329.4 vs 7752.0±3014.4 and 8320.4±5383.7 mU•min/ml , respectively . Triglycerides , non-HDL cholesterol and apolipoprotein B plasma levels improved significantly in the minimal intensity PA regime compared to sitting and showed non-significant trends for improvement compared to exercise . Conclusions One hour of daily physical exercise can not compensate the negative effects of inactivity on insulin level and plasma lipids if the rest of the day is spent sitting . Reducing inactivity by increasing the time spent walking/st and ing is more effective than one hour of physical exercise , when energy expenditure is kept constant
R and omized controlled trials found a positive correlation for SB with BMI , neck circumference , fat mass , HbA1C , cholesterol and insulin levels , cohort studies additionally for WC , leptin , C-peptide , ApoA1 and Low density lipoprotein and a negative correlation for HDL .
Most studied biomarkers associated with SB were of cardiovascular or metabolic origin .
OBJECTIVE Pathomechanisms of sedentary behaviour ( SB ) are unclear .
We conducted a systematic review to investigate the associations between SB and various biomarkers in older adults .