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Reviews of published studies on current topics in sports
medicine. The full articles can be obtained from hospital
and medical school libraries. To order complete Sports Reports
online for these topics and more complete
our online form.
ASTHMA AND EXERCISE-INDUCED BRONCHOSPASM
Diagnosing Exercise-Induced Asthma and Related Symptoms:
Studies indicate that using a sole screening method (patient
survey, physical exam, positive bronchial provocation)
may not be sufficient to diagnose all athletes who experience
exercise-induced bronchospasms or related asthmatic symptoms
[2, 3]. In future investigations, researchers recommend
that
testing methods be carefully standardized, as a difference
in exercise intensity of as little as 10% has been shown
to affect the presence of bronchoconstrictive symptoms
in diagnosed asthmatic patients [1].
1. Carlsen K-H, Engh G, Mork M. Exercise-induced bronchoconstriction
depends on exercise load. Respiratory Medicine 2002:94:750-755.
A study with 20 asthmatic children (9-17 years old) sought
to determine the effect of exercise load on exercise-induced
bronchoconstriction. Subjects performed two treadmill tests
at 85% and 95% of maximum heart rate (calculated based
on age). Lung functions were measured prior to test and
during
a fifteen-minute recovery period afterwards, and children
also completed a self-evaluation of perceived exertion.
Results showed that although all subjects showed a decrease
in forced
expiratory volume (FEV1) of equal to or greater than 10%
of baseline after 95% exercise load, only 9 subjects (40%)
showed a similar decrease after 85% exercise load. This
indicates that testing at a greater exercise load induces
bronchoconstrictive
symptoms in asthmatic subjects with greater regularity
than at reduced exercise loads. Authors suggest that exercise
tests used to interpret exercise-induced bronchoconstriction
should be strictly standardized to avoid misdiagnosis.
ACUPUNCTURE AS THERAPY FOR CHRONIC PAIN
Numerous studies of acupuncture have revealed it to be
a viable and efficacious therapy for the treatment
of chronic pain. Subjects with chronic conditions such
as low back
pain,
neck pain, and tennis elbow have used acupuncture to
relieve pain intensity, improve sleep, and increase functionality
[1, 2, 3]. Some authors have demonstrated that the
effects
of acupuncture may be due to patient expectations [4]
or a more general placebo effect [6]. Others have shown
that
needling is important to the treatment, although the
effects of choosing specific points remain unclear [5].
However,
all the studies reviewed below conclude that, for whatever
reason, acupuncture can be an effective and safe supplemental
therapy for chronic pain management.
1. Carlsson CPO,
Sjslund BH. Acupuncture for chronic low pack pain: a
randomized placebo-controlled study with long-term
follow-up. The Clinical Journal of Pain 2001:17:4:296-305.
Fifty
subjects with chronic low-back pain were treated with acupuncture
therapy or active placebo
once a
week for a period
of eight weeks. During a follow-up period of
six months, subjects received two additional
treatments
and were
also assessed by an independent observer. Subjects
also kept
individual pain diaries that recorded analgesic
intake, pain intensity,
quality of sleep, and activity level. Results
showed that fourteen out of thirty-four subjects
receiving
acupuncture
reported improvement that lasted during the
entire six months, while only two out of fourteen control
subjects
reported
similar improvement. Specifically, acupuncture
patients reported significant decreases in
pain
intensity,
as well as improvements
in sleep, analgesic intake, and ability to
work by one to three months into the follow-up period.
Authors
conclude
that needle acupuncture appears to provide
long-term pain relief to some patients with chronic low
back pain.
TREATMENT ISSUES FOR ANTERIOR CRUCIATE
LIGAMENT (ACL) INJURIES
When a tear of the ACL has been
diagnosed in an athlete, several decisions need to be
addressed. The first
decision is whether to proceed with surgery
or attempt rehabilitation
without surgery. If the decision is made
to have surgical treatment, questions arise as
to the
best
type of surgery
for that individual, the long-term outlook
after surgery, and types of rehabilitation
after surgery.
The following
are the author’s summaries of recently
published medical studies that address
these questions. The complete articles
can be found at most hospital, medical
school, or university libraries. The summaries
are
presented for educational purposes
only and are not in any way a substitute
for medical evaluation and treatment.
PATELLAR
TENDON vs. HAMSTRING : The two most
common graft choices for ACL reconstruction
are to use the patient’s own hamstring
tendon or part of the patellar tendon to
replace the ACL. Here are
some
studies comparing
the two methods.
1. Mark D. Shaieb, Darryl M.
Kan, Spencer K. Chang, Jay
M. Marumoto, Allen B. Richardson.
A prospective
randomized
comparison
of patellar tendon versus semitendinosus
and
gracilis tendon autografts for anterior
cruciate ligament
reconstruction . The American Journal
of Sports Medicine, March-April
2002 v30 i2 p214(7).
A comparison of patellar
tendon versus hamstring tendon for ACL reconstruction.
Study was
on 70 patients, all
surgery performed by the same surgeon.
At two year follow-up, 97% of patients
with
patellar
tendon grafts and 100% of
patients with hamstring tendon grafts
rated the results as
good or excellent. No significant
differences between groups in terms of activity level
or physical findings. Patellar tendon
patients
had
higher likelihood
of patellar-femoral pain at six months
and longer follow-up (42% versus 20% in the hamstring
group). There were two graft failures
in each
group.
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