REFERENT BODY WEIGHT VALUES IN OVER GROUND WALKING, OVER GROUND JOGGING, TREADMILL JOGGING, AND ELLIPTICAL EXERCISE
Background In order to make reliable clinical decisions in relation to when injured or surgically operated athletes may return to daily functional and weight-bearing sporting activities, there is a need to establish referent average weight-bearing values in common sporting activities.
Objectives To evaluate average percentage body weight (APBW) values and weight-bearing distribution percentages (WBDP) between sports activities in a referent adult population, and to suggest clinical implications.
Design Original research study.
Setting Lerner Sports Center, Hebrew University, Mount Scopus, Jerusalem, Israel.
Participants 75 asymptomatic volunteers, mean age=33.5(19–72) years SD=15.1, mean weight (kg)=70.7 (43–113) SD=14.1.
Interventions 4 tests were conducted: 1. Overground walking (OGW) over a 20m distance, 2. Overground jogging (OGJ) over a 20m distance, 3.Treadmill jogging (TJ) at a constant speed of 8.5 km/hr for a 15-second interval and 4. Elliptical exercise (EE) for a 20 second period at a resistance and incline level of 10, and a steady pace within the range of 70–95 steps/min.
Main outcome measure The Smartstep™ weight-bearing gait analysis system.
Results The APBW value on the entire foot in OGW was 112% (SD=15.57), in OGJ, 201% (SD=31.24, in TJ, 175% (SD=25.48) and in EE, 73% (SD=13.8). Regarding WBDP, the swing phase in OGJ and TJ was significantly longer than the stance phase (P<.05).
Conclusions EE significantly reduces weight-bearing as compared to other common functional and sporting activities. This information is also useful from a repetitive loading standpoint (to prevent overuse injury) or for exercise recommendations for those at greater risk for exacerbating chronic joint pathology.