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Volume 11, Issue 5 (3-2013)

The purpose of this investigation was to consider the Fast-Skin swimsuit's effect
on the elite female swimmers’ performance. So, twelve elite swimmers swam 50
and 200 m and 400 m trials with and without Fast-Skin at approximately 80-
100% of maximal effort in four swimming styles. In 400 m freestyle swimming,
traditional swimsuit compared with shoulder-to-ankle (SA) and shoulder-to-knee
(SK) of Fast-Skin (to control intensity, blood lactate and heart-rate was
measured). Also the propelling force of subjects was measured with indirect
way. Results showed, there was significant reduction in records of 50 m front
crawl, backstroke and butterfly, while no significant differences observed in
breaststroke. In 200 m for four swimming styles, reduction records were
significant. Also, different significant effect seen using traditional swimsuit in
comparison with SA and SK. Fast-Skin provide significant increased in
propelling force of front crawl, backstroke and butterfly, but no significant
propelling force observed in breaststroke. Using SA especially in fast front crawl
and semi-endurance butterfly and SK in endurance freestyle are recommended

Sasan Naderi, Dr Fariborz Mohammadi Pour, Dr Mohammad Reza Amir Seifo Dini,
Volume 13, Issue 9 (4-2015)

The purpose of current study was to investigate the spatio-temporal gait parameters and knee varus angle
during walking at different speeds in young with knee varus. 18 subjects with varus deformity classified at
grade 3 of bowleg and 17 healthy subjects, volunteered to participate in this study. The following variables
include stance, swing, double support and cycle time, cadence, stride length, angle of varus at the heel
contact, midstance and toe off when walking on the treadmill at speeds of 80, 100 and 120 percent of
preferred walking speed, were measured from using the three-dimensional motion analysis system with six
optoelectronic cameras. The results of between-group tests showed that spatio-temporal gait parameters
in the varus group is similar to the normal group. Also varus angular variables in varus group, was indicate
higher values in comparison to the healthy group, but there were no significant differences. The results of
inter-group tests also showed the knee varus angle generally increases with increasing speed, that none of
the differences were not significant. According to the results, the increase in walking speed will caused to
increase knee varus angle. Therefore, walking with speed less than the normal walking speed, probably is
a suitable solution to reduce the loads exerted on the knee joint and prevention of premature osteoarthritis
in young with knee varus.

Mr Mojtaba Ashrostaghi, Dr Elham Shirzad,
Volume 13, Issue 10 (10-2015)

Take-off is the critical phase of the long jump event. The aim of this study was to explore the relationships
between different variables and success in take-off. 37 trials performed by 8 long jumper, participants in
fourth indoor Asian senior athletics championships held in Tehran, with personal best average of 7.68±0.28
meter were recorded at 300 Hz. Five speed-related, five technical and four strength-related variables as well
as an anthropometric variable were measured using motion analysis software. More gain in vertical velocity
and less loss of horizontal velocity are considered as two criteria of take-off success and their relationships
with other variables were determined through correlation and regression analysis. Significant level of 0.05
was set. Some variables of all four groups were significantly correlated with success criteria. These variables
along with some others were entered in regression equations. The results emphasized on dominant role of
the technique and approach velocity and represented the effect of anthropometric characteristics on success
in takeoff. Furthermore eccentric strength of knee extensors was shown as the main strength factor in this

R Shiri, H Nikbakht, M Gholami, Kh Ebrahim,
Volume 18, Issue 19 (7-2020)

Time under Tension of muscle is one of the variables of strength training that contributes to its adaptation. The present study was conducted the effects of six weeks of resistance training with the varying Time under Tension of muscle on VEGF and endosotene serum levels  in healthy young women. This study was conducted on 20 female students (22.65±2.03years) Subjects were randomly and equally assigned to two groups with a Time under Tension of 1s- 1s(Normal Speed Contraction) and 3s- 3s (slow Speed Contraction). The exercise load was the same in both groups and resistance training was done in a circular manner for six weeks, three days a week in eight stations. Blood samples were taken from the subjects to study  research variables before the training period and 48h after the last session of the training. Data were analyzed by covariance analysis at a significant level of P≤0.05. There was no significant difference between the serum levels of VEGF and endostein in both groups (P≥0.05). In the strength test, the  SSC group experienced increase power further. However, there was no difference between the two groups in indicators related to angiogenesis for six weeks and  most probably, for this indicator needed more training time, but  practice with more Time under Tension (3s- 3s) can lead to increase power further.

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