![]() The authors hypothesized that: a) natural cadence would decrease on an anti-gravity treadmill compared to a standard treadmill, b) natural cadence would decrease with increasing body weight support on the anti-gravity treadmill, and c) over ground running cadence would be maintained through 50% of bodyweight, after which time it would no longer be feasible to maintain, and a 10% increase in step rate would be maintained through 60% of body weight. The secondary purpose was to determine if natural and increased cadence is affected by amount of body weight support. The primary purpose of this study was to determine how natural running cadence is affected by running on an anti-gravity treadmill compared to a standard treadmill in a healthy, active population. To the authors’ knowledge, no previous studies have investigated the effect of anti-gravity treadmill in a non-runner population or while allowing participants to use a self-selected pace. Spatiotemporal data collection in the previously mentioned studies was completed with in- shoe plantar pressure sensors. 21 On the anti-gravity treadmill, ankle and knee kinematics were significantly altered during stance phase as compared to standard treadmill, and stance time significantly decreased when body weight was less than 80%. studied lower body kinematics in healthy male runners at three conditions equivalent to 60%, 70%, and 80% VO2 peak capacity. 18 Across all speed intervals, as body weight support increased, step frequency decreased and step length increased. measured step length and frequency at five standardized speeds and at four BW% conditions on the anti-gravity treadmill in elite or sub-elite male runners. Two studies have investigated the effect of anti-gravity treadmill on running cadence. published metabolic conversions for standard treadmill speeds compared to anti-gravity treadmill at 50% to 100% body weight support. determined that, in healthy subjects, the metabolic cost of running was less on an anti-gravity treadmill with body weight support as compared to a standard treadmill. 18ĭifferences have been documented in both level of exertion and running mechanics between standard treadmill and anti-gravity treadmill running. Anti-gravity treadmills provide a mode of aerobic exercise that impart reduced ground reaction forces and are utilized in the rehabilitation community as well as in the healthy population. When air pressure increases, an upward force offloads the weight of the runner and decreases the percentage of body weight (BW%) experienced upon foot impact. The user walks or runs on a treadmill belt surrounded by an enclosed, air-filled chamber. 17Īn anti-gravity treadmill allows users to walk or run in a reduced body weight environment. found a step rate 10% above natural cadence was effective in transitioning those with a heel strike running pattern at initial contact to a non-heel strike or less severe heel strike pattern, altering ground reaction forces. demonstrated that an increase of 5% above natural running cadence reduces hip and knee joint loading, which may correlate with injury prevention and treatment of overuse injuries. Previous research supports the use of step rate manipulation through increased cadence to alter running kinetics and kinematics. Running step rate, or cadence, is routinely assessed in running gait analysis. 13- 15 During a period of injury rehabilitation and potential reduction in running tolerance, runners often utilize cross-training modalities such as elliptical training or pool-related activities to supplement for or replace the aerobic benefits of running. 1- 12 The reported lower extremity injury rate ranges from 18% to 94%, with the greatest percentage of injuries being related to the knee. ![]() The recreational sport of running is associated with a high risk of overuse injury.
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