Thursday-Abstracts

Official Journal of the American College of Sports Medicine
pain, and pain/effusion) with a week between each condition. A single injection of 5%
sodium chloride (1 mL) to the right infrapatellar fat pad and 0.9% sodium chloride (50
mL) to the suprapatellar pouch were administered to induce knee pain and effusion,
respectively. To induce pain/effusion, both injections were employed. No injection
was performed for the control. High-speed videography was used to measure lowerextremity
joint kinematics during walking. For each condition, subjects walked at three
time intervals: precondition (prior to injections), condition (3 minutes post injections),
and postcondition (30 min post injections). Functional linear models were utilized
to detect differences between groups. This analysis used all of the data during stance
phase, rather than discrete values.
rEsuLTs: The biggest changes were observed under the pain/effusion condition.
Compared to the precondition, subjects walked with more dorsiflexion (initial contact,
35-60% of stance phase, and toe off), more knee flexion (at initial contact and 30-90%
of stance phase), and less hip extension (37-82% of stance phase) in the involved side.
In the uninvolved side, subjects walked with more dorsiflexion (10-35% of stance
phase), knee flexion (3-20% and 50-70% of stance phase), and less hip abduction at toe
off. Subjects walked with more knee flexion (50-70% of stance phase) under isolated
knee pain condition while they walked with more knee flexion (45-80% of stance
phase) and more dorsiflexion at initial contact under isolated knee effusion condition.
CONCLusIONs: When a knee stimulus is combined with knee joint effusion it
appears to produce a summative effect on joint kinematics. Since knee joint effusion
is typically accompanied by pain, both variables should be aggressively managed in
acute and chronic stages of knee joint injury and rehabilitation in order to avoid plastic
changes to movement strategies.
1368 Board #2 May 30, 1:00 PM - 3:00 PM
Gait and speech are Interdependent in young healthy
adults
Tiphanie Raffegeau, Shirley Rietdyk, Jeffery M. Haddad, Jessica
Huber. Purdue University, West Lafayette, IN.
(No relationships reported)
Recent studies have demonstrated that gait involves executive function (EF). In healthy
adults, performing a concurrent task typically resulted in decreased performance of
the secondary task and reduced gait speed. Arbitrary tasks, typical to dual-task gait
research, such as counting backwards, may result in stronger associations between gait
and EF due to the novelty of the task and may not reflect typical behavior. Therefore,
it is important to extend the observations to common well-practiced tasks to fully
examine the relationship between gait and EF. Conversational speech relies on EF, and
people often talk while walking with a friend, providing an ideal concurrent task.
PurPOsE: To investigate the interdependence of gait and speech in young healthy
adults.
METhOds: 16 adults (9 males, 22±1.4 yrs) walked under two speech conditions,
talking and not talking. A topic was selected from a list and subjects spoke
extemporaneously for one minute. Gait and speech measures were recorded. Paired
t-tests were used to compare across conditions. Speech measures are currently being
analyzed, only gait measures are reported here
rEsuLTs: When speaking, gait speed decreased (1.44 ± .56 m/s to 1.36 ± .56 m/s,
(p