Article

OBJECTIVE: To examine whether runners recovering from a lower body
musculoskeletal injury have different metabolic, cardiopulmonary, and gait
responses compared with healthy runners.
DESIGN: Cross-sectional study. SETTING:
Research laboratory at an academic institution. METHODS: Healthy runners (n = 50)
were compared with runners who were recently injured but had returned to running
(n = 50). Both groups were participating in similar cross-training modalities
such as swimming, weight training, biking, and yoga. Running gait was analyzed on
a treadmill using 3-dimensional motion capture, and metabolic and cardiopulmonary
measures were captured simultaneously with a portable metabolic analyzer. MAIN
OUTCOME MEASURES: Rate of oxygen consumption, heart rate, ventilation,
carbohydrate and fat oxidation values, gait temporospatial parameters and range
of motion measures (ROM) in the sagittal plane, energy expenditure, and vertical
displacement of the body's center of gravity (COG). RESULTS: The self-selected
running speed was different between the injured and healthy runners (9.7 +/- 1.1
km/h and 10.6 +/- 1.1 km/h, respectively; P = .038). No significant group
differences were noted in any metabolic or cardiopulmonary variable while running
at the self-selected or standard speed (13.6 km/h). The vertical displacement of
the COG was less in the injured group (8.4 +/- 1.4 cm and 8.9 +/- 1.4,
respectively; P = .044). ROM about the right ankle in the sagittal plane at the
self-selected running speed during the gait cycle was less in the injured runners
compared with the healthy runners (P < .05). CONCLUSIONS: Runners with a recent
lower body injury who have returned to running have similar cardiopulmonary and
metabolic responses to running as healthy runners at the self-selected and
standard speeds; this finding may be due in part to participation in
cross-training modes that preserve cardiopulmonary and metabolic adaptations.
Injured runners may conserve motion by minimizing COG displacement and ankle
joint ROM during a gait cycle.
CI - Copyright (c) 2015 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.
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Langue : ANGLAIS