The Relationship Between Cardiorespiratory and Accelerometer-Derived Measures in Trail Running and the Influence of Sensor Location

• Purpose: To examine the relationship between cardiorespiratory and accelerometer-derived measures of exercise during trailrunning and determine the influence of accelerometer location.Methods: Eight trail runners (7 males and 1 female; age 26 [5] y;maximal oxygen consumption [  ̇VO2] 70 [6] mL·kg−1·min−1) completed a 7-km trail run (elevation gain: 486 m), with concurrentmeasurements of  ̇VO2, heart rate, and accelerations recorded from 3 triaxial accelerometers attached at the upper spine, lowerspine, and pelvis. External exercise intensity was quantified from the accelerometers using PlayerLoad™ per minute andaccelerometry-derived average net force. External exercise volume was calculated using accumulated PlayerLoad and the product of average net force and duration (impulse). Internal intensity was calculated using heart rate and  ̇VO2-metrics; internal volume was calculated from total energy expenditure (work). All metrics were analyzed during both uphill (UH) and downhill(DH) sections of the trail run.Results: PlayerLoad and average net force were greater during DH compared with UH for all sensorlocations (P ≤ .004). For all accelerometer metrics, there was a sensor position × gradient interaction (F2,1429.003;P <.001). The upper spine was lower compared with both pelvis (P ≤ .003) and lower spine (P ≤ .002) for all accelerometermetrics during both UH and DH running. Relationships between accelerometer and cardiorespiratory measures during UH running ranged from moderate negative to moderate positive (r = −.31 to .41). Relationships were stronger during DH running where there was a nearly perfect correlation between work and impulse (r = .91; P < .001).Conclusions: Simultaneous monitoring of cardiorespiratory and accelerometer-derived measures during trail running is suggested because of the disparity between internal and external intensities during changes in gradient. Sensor positioning close to the center of mass isrecommended.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP  -- Hälsovetenskap -- Idrottsvetenskap (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Health Sciences -- Sport and Fitness Sciences (hsv//eng)

Keyword

athlete

hilly terrain

IMU

inertial measurement unit

undulating terrain

Publication and Content Type

ref (subject category)

art (subject category)