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Spinal Cord. 2014 Jun;52(6):455-61. doi: 10.1038/sc.2014.58. Epub 2014 Apr 29.

Mountain time trial in handcycling: exercise intensity and predictors of race time in people with spinal cord injury.

Author information

1
1] Amsterdam Rehabilitation Research Center|Reade, Amsterdam, The Netherlands [2] University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Groningen, The Netherlands.
2
1] SCI unit, Rijndam Rehabilitation Center, Rotterdam, The Netherlands [2] Department of Rehabilitation Medicine, Erasmuc MC, Rotterdam, The Netherlands.
3
Amsterdam Rehabilitation Research Center|Reade, Amsterdam, The Netherlands.
4
SCI unit, Rijndam Rehabilitation Center, Rotterdam, The Netherlands.
5
Research and Development, Rehabilitation Center Heliomare, Wijk aan Zee, The Netherlands.

Abstract

STUDY DESIGN:

Cross-sectional analyses.

OBJECTIVES:

To analyze exercise intensity during a mountain time trial in handcycling and to determine predictors of race time.

SETTING:

Eight Dutch rehabilitation centers and Austrian mountain.

METHODS:

Forty participants with spinal cord injury (SCI; high lesion level (>T6): N=11; low lesion level (⩽T6): N=29) handcycled a 20.2-km mountain time trial. Heart rate (HR) was monitored in 17 (high: N=5, low: N=12) participants during the race to determine exercise intensity, expressed relative to the heart rate reserve (%HRR). Two weeks before the race all participants completed laboratory tests to measure anthropometrics and peak values for power output (POpeak), oxygen uptake (VO2peak) and HR.

RESULTS:

Mean race time was 4 h and 1 min (s.d.: 1 h and 24 min), with no difference in race time between lesion groups. Mean exercise intensity during the race was 70±7%HRR. Exercise was mainly (73% of the race time) at a vigorous intensity (60-89%HRR), with 29% of the total time in the 80-89%HRR zone. No clear differences were found in exercise intensities between lesion groups. The strongest predictors for better race times were higher mean %HRR during race (R(2)=57%), lower waist circumference (R(2)=39%), higher POpeak (R(2)=39%) and VO2peak (R(2)=32%).

CONCLUSION:

A 20-km mountain time trial in a handcycle is intensive. Faster race times were achieved by those with a lower waist circumference, greater fitness level and ability to perform at higher average exercise intensities during the race. Level of SCI was not significantly associated with race time.

PMID:
24777165
DOI:
10.1038/sc.2014.58
[Indexed for MEDLINE]

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