RunScribe Validation Research Study

timclarkValidation

Ground contact time during running is defined as the time elapsed between initial ground contact and toe off. The gold standard in measuring ground contact time during running is high speed video, where heel strike and toe off are manually digitised to find the time elapsed. This system is limited for reasons including the time consuming process of manual digitisation, … Read More

The Unescapable Fatigue Effect

timclarkAt the Races, Research

In an earlier article, I discussed the mechanics of how fatigue impacts pace during a marathon, but what happens to other metrics like ground contact time, flight ratio and impact characteristics?  We know these metrics are predictably affected by running speed in an unfatigued state.  As running speed increases, impact Gs, pronation, pronation velocity and flight time usually increase.  Contact time … Read More

Achieving Pace Consistency in Endurance Running

timclarkAt the Races, Research

Pace consistency is at the heart of a runner’s training and is important for endurance races like the marathon. Coaches help athletes find their rhythm early as to not burn energy. Achieving pace consistency seems simple, but mechanically our bodies make constant and subtle adjustments.  We know pace is a simple equation: Pace = Stride Length x Stride Rate. But … Read More

The Hot Topic of Cadence

timclarkLibrary

Running Physio highlights misunderstood aspects of running step rate (cadence) – and what can happen when you aim for 180 steps per minute.  

Rhythm & Stride Rate

timclarkTraining & Rehab, User Stories

Splits are all we have. They are like gold for the runner or coach, providing feedback on if the runner is too fast, too slow, or falling apart at the seams. But think about a race-car driver and their team. What if the mechanics only had access to the speedometer. They had no data on how the engine actually ran, … Read More

Deep Dive into the 2015 NYC Marathon

timclarkAt the Races

Motivation for running a marathon is varied and sometimes elusive. Each runner has a goal – to place, hit a PR or just finish standing up.  The NYC Marathon is the ultimate collection of motivations – every level of athlete doing whatever it takes to hit that goal. We wanted to capture those stories through the lens of running data. … Read More

The Impact of Pace on Mechanics

timclarkResearch, Training & Rehab

One of the most frequent questions we hear is “How do I compare to other runners.” Answering that question is more complicated than you’d think. For two runs or runners you’d like to objectively compare, it’s important that the pace and terrain are identical, otherwise you might as well be comparing apples to oranges. Our bodies naturally adapt, and your … Read More

The Finish (NYC 2015)

timclarkAt the Races, NYC2015-3

The finish is where you dig deep, give it everything you’ve got, knowing that it will be over soon. In Ellie’s case, we see the picture of an elite athlete who is holding on as hard as she can, in spite of a loss of efficiency (Flight Ratio started at 25% – and dropped down to nearly 15% toware the finish). … Read More

The Wall (NYC 2015)

timclarkAt the Races

The Wall is every runner’s torment.When will I hit it? Will I recover? How? Even an elite, consistent runner like Ellie, isn’t impervious to The Wall. At around mile 21 (35k), Ellie’s pace drops slightly as her Flight Ratio (an efficiency indicator) continues its slow downward trend (it’s fortunate that Ellie starts at elite levels!). But what is interesting is … Read More