Key result
Walking at 9 km/h for 10 minutes or 6 km/h for 20 minutes significantly increased the ratio of wavelet amplitudes of microvascular mechanisms compared with 3 km/h (P < .05).
Why the study?
Physical activity is recommended to prevent diabetes complications, but no study had evaluated how microvascular control mechanisms respond to different walking intensities in people with and without diabetes.
Do different walking speeds and durations alter plantar microvascular regulations in healthy people?
Do different walking speeds and durations alter plantar microvascular regulations in healthy people?
p-value: p=< .05
Different walking speeds and durations cause distinct plantar microvascular regulations in healthy individuals, which may inform exercise prescriptions for preventing diabetic foot ulcers.
May inform speed-specific walking prescriptions for plantar perfusion; leaves open translation to diabetic foot ulcer prevention.
Physical activity has been recommended by the American Diabetes Association (ADA) as a preventive intervention of diabetes complications. However, there is no study investigating how microvascular control mechanism respond to different walking intensities in people with and without diabetes. The purpose of this study was to assess microvascular control mechanism of the plantar foot in response to various walking speeds and durations in 12 healthy people using spectral analysis of skin blood flow (SBF) oscillations. A 3×2 factorial design, including 3 speeds (3, 6, and 9 km/h) and 2 durations (10 and 20 minutes), was used in this study. Plantar SBF was measured using laser Doppler flowmetry over the first metatarsal head. Borg Rating of Perceived Exertion (RPE) scale and heart rate maximum were used to assess the walking intensity. Wavelet analysis was used to quantify regulations of metabolic (0.0095-0.02 Hz), neurogenic (0.02-0.05 Hz), myogenic (0.05-0.15 Hz), respiratory (0.15-0.4 Hz), and cardiac (0.4-2 Hz) controls. For 10-minute walking, walking at 9 km/h significantly increased the ratio of wavelet amplitudes of metabolic, neurogenic, myogenic, respiratory, and cardiac mechanisms compared with 3 km/h ( P < .05). For 20-minute walking, walking at 6 km/h significantly increased the ratio of wavelet amplitudes of metabolic, myogenic, respiratory, and cardiac compared with 3 km/h ( P < .05). RPE showed a significant interaction between the speed and duration factors ( P < .01). This is the first study demonstrating that different walking speeds and durations caused different plantar microvascular regulations.
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Wu et al. (2020) studied Healthy (n=12). Walking at different speeds and durations vs. Walking at 3 km/h was evaluated on Ratio of wavelet amplitudes of metabolic, neurogenic, myogenic, respiratory, and cardiac mechanisms (p=< .05). Walking at 9 km/h for 10 minutes or 6 km/h for 20 minutes significantly increased the ratio of wavelet amplitudes of microvascular mechanisms compared with 3 km/h (P < .05).
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