10 research outputs found
Innovative Approaches in a Community Based Educational/Treatment Unit for Mentally Ill Adolescents
Relative importance of ocean currents and fronts in population structures of marine fish: a lesson from the cryptic lineages of the Hippocampus mohnikei complex
Strangulation of the Small Intestine Secondary to Meckel's Diverticulitis: Report of a Case in Old Age
Standardization of the behavioral and emotional rating scale: Factor structure, reliability, and criterion validity
Use of the public mental health system by children in foster care: Client characteristics and service use patterns
Privatized medicaid managed care in massachusetts: Disposition in child and adolescent mental health emergencies
Are there differences in performance, metabolism, and quadriceps muscle activity in black African and Caucasian athletes during brief intermittent and intense exercise?
The purpose of the present study was to determine
whether there are any differences in power output (PO) and/or
quadriceps muscle (Quad) activity between black African and
Caucasian football players during a force-velocity (fv) exercise
test, which consisted of performing maximal 6-s sprints against
an increasing load. Each subject started the test with a load of 2
kg and then recovered for 5 min before repeating the same test
with a load increased by 2 kg. When the pedal frequency did not
exceed 130 rev·min–1, the load was increased by only 1 kg.
Each subject attained the load corresponding to his maximal
power if an additional increase in load (+1 kg) induced a power
decrease. Nine black Africans (mean age 24.2 ± 3.3 years) and
nine Caucasians (24.7 ± 4.2 years) (matched for stature and
aerobic fitness) participated in the fv exercise test. During the
test, PO, blood lactate, and the quadriceps electromyography
(EMG) root mean square (Quad RMS) were assessed. Higher
blood lactate was observed in Caucasians than in black Africans
for POs over the load range from 4 kg up to the maximal power.
However, PO and Quad RMS values were similar in Caucasians
and black Africans. They also had similar lean leg volume (LLV)
and consequently produced similar PO/LLV and Quad RMS/LLV
values. Overall, our results suggest that Caucasians and black
Africans matched for stature, max, and training background
have similar PO and Quad RMS values, but different blood lactate
concentrations during brief, intermittent, intense exercise
performed on a cycloergometer