The effect of acute fatigue on reactive strength index in modern dancers (original) (raw)
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Upper-body muscular endurance in female university-level modern dancers: a pilot study
Physical demands vary among dance styles, and injury patterns differ accordingly. Modern dance tends to be high in upper-body demands, and university-level female modern dancers are suggested to be at high risk for upper-body injury. Low muscular endurance is a known injury risk factor. Whether modern dancers have different upper-body muscular endurance than non-dancers is unclear. Thus, the purpose of this study was to compare upper-body endurance in female university-level modern dancers (n = 17) and physically active non-dancers (n = 15), using the modified push-up test. Pearsoncorrelations examined relationships between anthropometrics and push-ups. Multiple regression analyses were used to determine whether anthropometrics and physical activity could predict push-up scores. One-way ANOVAs compared upper-body endurance (number of pushups) and physical activity between groups (p < 0.05). Except for height (r = -.37), no variables were related to push-ups. Neither anthropometrics nor physical activity were able to predict push-up scores (p = 0.25). Despite dancers being more active/day (3.6 ± 1.9 vs. 0.9 ± 0.4 hrs/day, p < 0.001), more times per week (5.4 ± 1.2 vs. 4.0 ± 1.8, p = 0.02), and having greater overall physical activity volumes (20.4 ± 11.4 vs. 3.3 ± 2.5 hrs/week, p < 0.001) than non-dancers, both groups had similar upper-body endurance (22.2 ± 8.6 vs. 19.9 ± 8.2, p = 0.44). A probable explanation for this similarity exists in the lack of physical activity beyond dance itself performed by the dancers; our preliminary work suggests that modern dance alone may not produce upper-body muscle endurance gains. Hence, it is suggested that modern dancers should engage in strength and conditioning training programs to enhance upper-body endurance.
100 Assessment of a novel fatigue protocol for contemporary dancers
Journal of Science and Medicine in Sport, 2005
Nine trained contemporary dancers performed a modality-specific, heart-rate-monitored, choreographed fatiguing dance protocol with an assumption of fatigue at volitional exhaustion (RPE 16). Postural stability was assessed as the variability of ground reaction forces and the centre of pressure during the performance of a flat-foot arabesque. Psychological response was assessed using self-reported fatigue, psychological distress (PD), and psychological well-being (PWB) (Subjective Exercise Experience Scale). After reaching RPE 16 in 15.7 ± 2.6 mins, heart rate decreased to the post-warm-up level within 64 ± 9 sec. Variability of ground reaction forces or the centre of pressure was not changed. There were no significant changes in fatigue, psychological distress, or psychological well-being. Within fatigue, there was a significant increase in the item tired (p = 0.04). As supported by the heart rate data and RPE, the protocol achieved an appropriate level of physical demand. No changes in the stability indices were observed, possibly attributed to the rapid recovery in heart rate. The expression of only tiredness suggests the use of a disassociative attentional style by the dancers. The project represents pilot work toward the validation of a monitoring process that supports dancer health and awareness training.
Journal of strength and conditioning research / National Strength & Conditioning Association, 2016
Stretching is used to increase joint range of motion, but the acute effects can decrease muscle strength. However, this may depend on the population or mode of stretching. The purpose of this study was to compare the acute effects of static vs. ballistic stretching on strength and muscular fatigue between ballet dancers and resistance trained women. Fifteen resistance trained women (age 23.8 ± 1.80 yrs, mass 67.47 ± 7.77 kg, ht 168.30 ± 5.53 cm) and 12 ballet dancers (age 22.8 ± 3.04 yrs, mass 58.67 ± 5.65 kg, ht 168.00 ± 7.69 cm) performed 5 days of testing. The first day was control (no stretching) while the other four days were static or ballistic stretching in a counterbalanced order. Range of motion (ROM), strength and fatigue tests were also performed. Both groups demonstrated a significant decrease in hamstrings strength after static (102.71 ± 2.67 Nm) and ballistic stretching (99.49 ± 2.61 Nm) compared to control (113.059 ± 3.25 Nm), with no changes in quadriceps strength. F...
Lower Limb and Trunk Biomechanics After Fatigue in Competitive Female Irish Dancers
Journal of Athletic Training
Context: Because of the increasing popularity of participation in Irish dance, the incidence of lower limb injuries is high among this competitive population. Objective: To investigate the effects of fatigue on the peak lower limb and trunk angles as well as the peak lower limb joint forces and moments of competitive female Irish dancers during the performance of a dance-specific single-limb landing. Design: Cross-sectional study. Setting: Laboratory. Patients or Other Participants: Fourteen healthy, female, competitive Irish dancers (age = 19.4 ± 3.7 years, height = 165.3 ± 5.9 cm, mass = 57.9 ± 8.2 kg). Intervention(s): Participants performed an Irish dance–specific leap before and after a dance-specific fatigue protocol. During each landing movement, 3-dimensional lower limb kinematics (250 Hz) and ground reaction forces (1000 Hz) were collected. Paired t tests were performed to determine the differences (P ≤ .05) in lower limb and trunk biomechanics prefatigue and postfati...
Rate of Fatigue of Explosive Force of Lower Extremities of Artistic Gymnasts
Acta Facultatis Educationis Physicae Universitatis Comenianae
Summary The aim of our work was to find out the level of explosive force of lower extremities and the rate of muscular fatigue of lower extremities of artistic female gymnasts. The research file consisted of 8 female competitors of B category (year of birth: 2010.5 ± 1.20, physical height 148 ± 10 cm, body weight 36.25 ± 5.44 kg, BMI 16,46 ± 0,68 kg/m2). In our ex post facto research, which took place in gymnastic club PAVLO Trencin, we used measuring device FiTRO Jumper that has been placed on floor exercise. In input and output measurement we found out the parameters of jumps by two standardized tests. The female probands had 2 attempts (IO: 2´) in each motoric test we recorded the better attempt on the tables. We measured the height of upward leap (V.V.) [cm] in vertical jump with countermovement (VVsPP) without swing work of arms. In 10s test of repeated upward leaps without the aid of arms we measured power in active phase of take-off (Pmax) in [W.kg−1] and fatigue index (I.U.)...
Determination of Vertical Jump as a Measure of Neuromuscular Readiness and Fatigue
Journal of strength and conditioning research, 2017
Coaches closely monitor training loads and periodize sessions throughout the season to create optimal adaptations at the proper time. However, only monitoring training loads ignores the innate physiological stress each athlete feels individually. Vertical jump (VJ) is widely used as a measure of lower body power, and has been used in post-match studies to demonstrate fatigue levels. However, no pre-training monitoring via VJ performance has been previously studied. Therefore, the purpose of this study was to determine the sensitivity of VJ as a measure of readiness and fatigue on a daily sessional basis. Ten healthy resistance trained males (mass= 91.60 kg± 13.24 kg; height= 179.70 cm± 9.23 cm; age= 25.40 yrs± 1.51 yrs) and seven females (mass= 65.36 kg± 12.29 kg; height= 162.36± 5.75 cm; age= 25.00 yrs± 2.71 yrs) volunteered to participate. VJ and BRUNEL Mood Assessment (BAM) were measured four times: pre-workout one, post-workout one, pre-workout two, and post-workout two. Workout...
International Journal of Sports Science & Coaching
The purpose of this study was to evaluate the acute effects of static-stretching (SS) session with (intermittent) and without (continuous) rest intervals between sets on the bounce drop jump performance, with the same volume and intensity. The experimental protocol consisted of (1) a brief warm-up using sub-maximal jumps; (2) a preSS evaluation (passive ankle ROM and three trials of maximal single-leg jumping task for each lower limb); (3) ankle plantar flexors SS protocol (intermittent or continuous) was used only for a single-lower limb; (4) immediate post-SS evaluation (passive ankle ROM and three trials of maximal single-leg jumping task for the stretched lower limb). Then, subjects rest for 30 minutes and the topics 3-4 were repeated with the other lower limb and stretching protocol. The intensity used for both stretching protocols was between 70-90% of the point of discomfort. There were significant decrease in jumping height performance for both stretching protocols: continuo...
2013
The purpose of this study was to examine the effect of fatigue on peak vertical ground reaction force and lower extremity kinematics during single-leg landing in dancers and non-dancers. Subjects (n=20) were divided into two groups; Dance group (n=10) and Control group (n=10). Subjects performed single-leg drop landing from a 30 cm platform before and after fatigue protocol. Before fatigue protocol, dancers showed significant longer time between initial contact and the maximum ground reaction force achieved compared with the controls. After fatigue protocol, there was significant increase in peak ground reaction force during landing for both dancers and controls. Both groups also showed significant increase in hip and knee flexion after fatigue protocol.
Effects of fatigue on kinetic and kinematic variables during a 60-second repeated jumps test
International journal of sports physiology and performance, 2010
The aim of this study was to investigate the effects of a maximal repeated-jumps task on force production, muscle activation and kinematics, and to determine if changes in performance were dependent on gender. Eleven male and nine female athletes performed continuous countermovement jumps for 60 s on a force platform while muscle activation was assessed using surface electromyography. Performances were videotaped and digitized (60 Hz). Data were averaged across three jumps in 10-s intervals from the initial jump to the final 10 s of the test. No interaction between time and gender was evident for any variable; therefore, all results represent data collapsed across gender. Preactivation magnitude decreased across time periods for anterior tibialis (AT, P < .001), gastrocnemius (GAS, P < .001) and biceps femoris (BF, P = .03), but not for vastus lateralis (VL, P = .16). Muscle activation during ground contact did not change across time for BF; however, VL, G, and AT showed signi...