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The efficacy of interrupting prolonged sitting may be influenced by muscle activity patterns. This study examined the effects of interrupting prolonged sitting time with different muscle activity patterns on continuously monitored postprandial glycemic response. Eighteen overweight and obese men (21.0 ± 1.2 years; 28.8 ± 2.2 kg/m2) participated in this randomized four-arm crossover study, including uninterrupted sitting for 8.5 h (SIT) and interruptions in sitting with matched energy expenditure and duration but varying muscle activity: 30-min walking at 4 km/h (ONE), sitting with 3-min walking at 4 km/h (WALK) or squatting (SQUAT) every 45 min for 10 times. Net incremental area under the curve (netiAUC) for glucose was compared between conditions. Quadriceps, hamstring, and gluteal muscles electromyogram (EMG) patterns including averaged muscle EMG amplitude (aEMG) and EMG activity duration were used to predict the effects on glucose netiAUC. Compared with SIT (10.2 mmol/L/h [95%CI 6.3 to 11.7]), glucose netiAUC was lower during sitting interrupted with any countermeasure (ONE 9.2 mmol/L/h [8.0 to 10.4], WALK 7.9 mmol/L/h [6.4 to 9.3], and SQUAT 7.9 mmol/L/h [6.4 to 9.3], all p < 0.05). Furthermore, WALK and SQUAT resulted in a lower glucose netiAUC compared with ONE (both p < 0.05). Only increased aEMG in quadriceps (−0.383 mmol/L/h [−0.581 to −0.184], p < 0.001) and gluteal muscles (−0.322 mmol/L/h [−0.593 to −0.051], p = 0.022) was associated with a reduction in postprandial glycemic response. Collectively, short, frequent walking or squatting breaks effectively enhance glycemic control in overweight and obese men compared to a single bout of walking within prolonged sitting. These superior benefits seem to be associated with increased muscle activity intensity in the targeted muscle groups during frequent transitions from sitting to activity.
Результат:
Interrupting Prolonged Sitting for Glycemic Control
Objective:
Examine how different muscle activity patterns during interruptions of prolonged sitting affect postprandial glycemic response.
Participants:
Eighteen overweight and obese men, aged 21.0 ± 1.2 years, BMI 28.8 ± 2.2 kg/m².
Study Design:
Randomized four-arm crossover study:
1 Uninterrupted sitting for 8.5 hours (SIT)
2 30-minute continuous walking at 4 km/h (ONE)
3 Sitting with 3-minute walking at 4 km/h every 45 minutes, 10 times (WALK)
4 Sitting with 3-minute squatting every 45 minutes, 10 times (SQUAT)
Outcome Measure:
Net incremental area under the curve (netiAUC) for glucose.
Results:
• Glucose netiAUC:
• SIT: 10.2 mmol/L/h
• ONE: 9.2 mmol/L/h
• WALK: 7.9 mmol/L/h
• SQUAT: 7.9 mmol/L/h
Comparative Analysis:
• All interruptions (ONE, WALK, SQUAT) significantly reduced glucose netiAUC compared to SIT (p < 0.05).
• WALK and SQUAT had a greater reduction in glucose netiAUC compared to ONE (p < 0.05).
Muscle Activity Analysis:
• Increased average muscle EMG amplitude (aEMG) in quadriceps and gluteal muscles was associated with reduced postprandial glycemic response:
• Quadriceps: −0.383 mmol/L/h
• Gluteal muscles: −0.322 mmol/L/h
Conclusion:
Short, frequent walking or squatting breaks during prolonged sitting significantly enhance glycemic control in overweight and obese men, likely due to increased muscle activity intensity during these transitions.