Rehab Centers: Acute Response of High-Intensity and Traditional Resistance Exercise on Anaerobic Power.
Acute Response of High-Intensity and Traditional Resistance Exercise on Anaerobic Power.
Filed under: Rehab Centers
J Strength Cond Res. 2012 Dec 12;
Austad MA, Gay CR, Murray SR, Pettitt RW
ABSTRACT: Quantifying the maximal work capacity (W’) above the aerobic critical power (CP) has emerged as a method for estimating anaerobic work capacity. Slower cadence, lower-load resistance training (RT), colloquially referred to as High-intensity training (HIT), made up of slower cadence, lower-load resistance, is purported to be a better metabolic stressor than faster cadence, higher-load TR, but to date this belief has not been supported by research. We compared the acute effects of HIT and traditional RT bouts on average power within a 150-second time period (P150 s), CP and W’, as measured from a 3-minute all-out exercise test using cycling ergometry (3 MT). Eight recreationally active male subjects (mean ± SD: age 22 ± 2 years, body mass 85 kg ± 14 kg, and height 183 cm ± 9 cm) completed a baseline 3 MT, 10 repetition maximum testing on leg-press and leg-extension machines, and post-bout 3 MTs following a HIT (4:2 second cadence) or traditional RT bout (1:1 second cadence). Measurements of CP from the 3 MT were similar between the baseline, post-HIT (? = 0.96) and post-traditional RT bouts (? = 0.98). Neither HIT (269.2 ± 51.3 W) nor traditional RT (275.1 ± 51.3 W) evoked depreciations (P > 0.05) in P150 s from the baseline (275.1 ± 45.4 W). Moreover, estimates of W’ at the baseline (8.3 ± 3.2 kJ) were unaffected (P > 0.05) either by the HIT (7.6 ± 2.3 kJ) or the traditional RT (8.3 ± 1.3 kJ) bouts. These data indicate that the 4:2 cadence is insufficient to exhaust a person’s capacity for high-intensity work. Longer RT durations, either by slower cadences or by multiple sets, are necessary to evoke substantive declines on W’ and should be investigated.
HubMed – rehab
Quantitative Examination of Upper and Lower Extremity Muscle Activation during Common Shoulder Rehabilitation Exercises using the Bodyblade®
Filed under: Rehab Centers
J Strength Cond Res. 2012 Dec 12;
Oliver GD, Sola M, Dougherty C, Huddleston S
ABSTRACT: The kinetic chain approach to shoulder rehabilitation has become a standard of care within sports medicine. Attempting to incorporate the kinetic chain method of proximal stability for distal mobility requires a stable base of not only the lower extremity but also the upper extremity. Therefore it was the purpose of the current study was to quantify muscle activation of the upper and lower extremity during common shoulder rehabilitation exercises using the Bodyblade®. An observational descriptive study design was utilized. Thirty healthy collegiate graduate students (23.5 ± 1.34yr; 174.4 ± 11.0cm; 76.6 ± 16.9kg), regardless of gender, consented to participate. The independent variables were the two observational categories of exercise and muscle. The dependent variable was considered muscle activation as presented as percent maximum voluntary isometric contraction [%MVIC]. Results revealed moderate to moderately strong activation of both the musculature of the upper and lower extremity while performing the shoulder rehabilitation exercises. The findings of this study demonstrate that any of these exercises may be incorporated into a shoulder rehabilitation program. The muscle activations described in this study are beneficial in choosing appropriate exercises to perform during shoulder rehabilitation. Information from this study can be applied to the kinetic chain approach to shoulder rehabilitation where focus is on the movement pattern. The Bodyblade® is a unique rehabilitation tool because a variety of kinetic chain movement pattern exercises allow for scapular control via muscle activation about the hip and shoulder.
HubMed – rehab
The effects of eccentric exercise on muscle function and proprioception of individuals being overweight and underweight.
Filed under: Rehab Centers
J Strength Cond Res. 2012 Dec 12;
Paschalis V, Nikolaidis MG, Theodorou AA, Deli CK, Raso V, Jamurtas AZ, Giakas G, Koutedakis Y
ABSTRACT: The aim of the present study was to estimate the effect of being overweight or underweight on proprioception at rest, as well as after muscle damaging eccentric exercise. Twelve lean, twelve overweight and eight underweight females performed an eccentric exercise session using the knee extensor muscles of the dominant leg. Muscle damage indices and proprioception were assessed up to 3 days post exercise. The results indicated that proprioception at baseline of the lean individuals was superior to the other two groups. The overweight individuals exhibited smaller knee joint reaction angle to release than the lean group while the underweight individuals exhibited larger reaction angle to release than the lean group. After eccentric exercise proprioception was affected more in the overweight and the underweight groups than the lean group. The greater exercise induced muscle damage appeared in the overweight group and the deficient muscle mass of the underweight participants could explain in part the greater disturbances appeared in proprioception in these two groups than the lean counterparts. In conclusion, deviating from the normal body mass is associated with significant disturbances in the proprioception of the legs at rest as well as after participation in activities involving eccentric actions.
HubMed – rehab
Physiological determinants of the cycling time trial.
Filed under: Rehab Centers
J Strength Cond Res. 2012 Dec 12;
Støren O, Ulevåg K, Larsen MH, Støa EM, Helgerud J
ABSTRACT: The purpose of this study was to examine the physiological determinants of endurance cycling time trial performance in a heterogeneous group of competitive male road cyclists. 15 male cyclists who had all competed in cycling the preceding season were tested for the anthropometric variables height, body weight, leg length, ankle circumference and body fat percentage. They were also tested for maximal oxygen consumption (VO2max), lactate threshold (LT), metabolic cost of cycling (CC), peak power output and average power output during a 30s Wingate test, 1RM and peak power in half-squats, and a time trial test (TT) on an ergometer. Heart rate (HR) and cadence (RPM) were continuously measured during all cycle tests. Pearson Bivariate correlation tests and single linear regression tests were performed to obtain correlation coefficients (r), effect size (F), standard error of estimate (SEE) and 95% confidence interval (CI). The single variable that correlated best with TT performance was power output at LT (r=0.87, p<0.01). SEE was 7.5%. LT expressed in %VO2max did not correlate significantly with TT performance. An equation representing both aerobic and anaerobic endurance capacity TT (w) = 0.95((VO2max / CC)TT %VO2max)+ 0.05(Wingate average) correlated strongly with TT laboratory performance (r=0.93, p<0.01, SEE = 5.7%). None of the strength, power or anthropometric variables correlated significantly with TT laboratory performance. HubMed – rehab
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