We investigated the biomechanical and physiological characteristics of walking on a sandy beach and in a forest. Ten healthy subjects (aged 50 - 69 years) with average aerobic exercise ability walked on the following three courses, each 100-m long: concrete road, sandy beach and forest road. Subjects walked 300 m along each course. Various biomechanical and physiological parameters were measured. Significant differences were found in the following biomechanical data (p < 0.05): walking speed (concrete > beach ≈ forest), step length (concrete > beach ≈ forest), cadence (forest < beach ≈ concrete), shock load to the knee at heel contact (beach < concrete ≈ forest) and its variability (concrete < beach ≈ forest), activity of the tibialis anterior at heel contact (concrete > beach ≈ forest), activity of the peroneus longus at heel contact (forest > concrete ≈ beach), and activity of the triceps surae just before swing phase (forest < concrete ≈ beach). In physiological data, heart rate was within the range for aerobic training. Heart rate and calorie consumption in the 300-m walk were lower for concrete than for the other courses. In all courses, rating of perceived exertion was lower than “somewhat hard” and maximal blood pressure was within a safe range. These biomechanical and physiological characteristics of walking on a sandy beach and in a forest were discussed in relation to health maintenance and promotion.
View full abstract