Maximal Strength Training: The Effects on Intramuscular Economy and its Determinants

Introduction: Hip fractures predominantly occur in the geriatric population and results in increased physical inactivity and reduced independency, largely influenced by a downward spiral of ambulatory capacity, related to loss of skeletal muscle strength and postural stability. Thus, effective postoperative treatment, targeting improvements in muscle strength, is sought after. Materials & Methods: Twenty-one hip fracture patients (>65 yr) were randomized to 8 weeks of either conventional physiotherapy control group (CG), or leg press and hip abduction maximal strength training (MST) 3 times per week. MST was performed applying heavy loads (85-90% of 1 repetition maximum; 1RM) and 4-5 repetitions in 4 sets. Maximal strength (bi- and unilateral 1RM), postural stability (unipedal stance test; UPS), and DEXA-scan bone mineral content/ density (BMC/BMD) were measured before and after the 8-week rehabilitation. Results: Both MST and conventional physiotherapy improved bilateral leg press 1RM by 41 ± 27 kg and 29 ± 17 kg, respectively (both p < 0.01), while unilateral leg press 1RM only increased after MST (within group and between groups difference: both p < 0.05). MST also resulted in an increase in abduction 1RM in both the fractured (5 kg, 95%CI: 2-7; p < 0.01) and healthy limb (6 kg, 95%CI: 3-9; p < 0.01), while no such improvement was apparent in the CG (between groups difference: p < 0.01). Finally, MST improved UPS of the fractured limb (p < 0.05). No differences were observed in BMC or BMD following the 8 weeks. Discussion: Early postoperative MST improved lower extremities maximal muscle strength more than conventional physiotherapy and was accompanied by improvements in postural stability. Conclusion: Implementing MST in early rehabilitation after hip fracture surgery should be considered as a relevant treatment to curtail the downward spiral of reduced ambulatory capacity typical for this patient group, possibly reducing the risk of recuring falls and excess mortality. Trial Registration: https://clinicaltrials.gov/ct2/show/NCT03030092

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Účinnosť všeobecného a kombinovaného silového tréningu na zmeny rýchlostno-silových schopností mladých hokejistov

Studia sportiva ◽

10.5817/sts2012-2-5 ◽

2012 ◽

Vol 6 (2) ◽

pp. 46-53

Author(s):

Marián Vanderka ◽

Milan Kabát

Keyword(s):

Strength Training ◽

Performance Enhancement ◽

Training Group ◽

Ice Hockey ◽

Maximal Strength ◽

Specific Test ◽

Combined Training ◽

Standing Long Jump ◽

Test Parameters ◽

Long Jump

Purpose of this study was to compare effects of general strength training with combined maximal strength and plyometrics training. Twelve young ice hockey players were examined and intervened 4-week general strength training (EX1) at first and consequently 4-week, combined training (EX2). Combined training consisted of maximal strength workouts with 2-4 repetitions on 85-95% 1RM and subsequent application of plyometrics workouts with 6-10 repetitions. The training group performed 2 sessions per a week in 3 sets of exercises. The measurements were assessed before, between and after periods and consisted of specific test performed on ice and non-specific tests off ice. The results showed that in EX2 period SJ improved from 33,3 ± 2,89 cm to 34,35 ± 2,80 cm by 1,05 cm (3,2%; p<0,01); CMJ from 36,51 ± 4,39 cm to 37,84 ± 4,36 cm by 1,33 cm (3,6%; p<0,01). Also in EX1 period SJ was changed from 32,48 ± 3,65 cm to 33,3 ± 2,89 cm (p<0,05). Anaerobic alacticpower (AAV) changed significantly in EX1 period from 42,09 ± 4,48 W.kg-1 to 42,72 ± 4,61 W.kg-1 (p<0,01) afterwards in EX2 period to 43,78 ± 4,44 W.kg-1 (p<0,01). In jumping performances we measured in both periods significant improvements; standing long jump (SZM) in EX1 period from 246,25 ± 11,07 cm to 249,17 ± 10,32 cm (p<0,01) then in the end of EX2 period 253,58 ± 9,83 cm (p<0,01). Standing triple jump (3SK), agility run (10x5) and all specific test on ice were significant changes recorded only in EX2 period. 3SK from 722,42 ± 29,58 cm to 727,50 ± 30,64 cm; 10x5m from 17,00 ± 0,57 s to16,90 ± 0,57 s (p<0,01); on ice speed tests (1x36m) from 4,95 ± 0,10 s to 4,88 ± 0,09 s by 1,4% (p<0,01); (6x9m) from 13,73 ± 0,48 s to 13,63 ± 0,51 s by 0,8% (p<0,05); in speed endurance ice hockey skating test (Okr) form 14,79 ± 0,18 s to 14,67 ± 0,20 s o 0,8% (p<0,05). Skills ice hockey test parameters (Sla) did not changed significantly in EX1 neither in EX2 period. It could be concluded that both periods had effect on motor performance enhancement, but EX2 training period was more sufficient for improvement in speed-strength abilities especially in specific condition on ice.

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The Effect of Maximal Strength Training on Strength, Walking, and Balance in People with Multiple Sclerosis: A Pilot Study

Multiple Sclerosis International ◽

10.1155/2016/5235971 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Herb I. Karpatkin ◽

Evan T. Cohen ◽

Sarah Klein ◽

David Park ◽

Charles Wright ◽

...

Keyword(s):

Multiple Sclerosis ◽

Strength Training ◽

Berg Balance Scale ◽

Attendance Rate ◽

Maximal Strength ◽

Lower Extremity Strength ◽

6Mwt Distance ◽

Fatigue Severity ◽

Walking Balance ◽

6 Minute Walk Test

There is little literature examining the use of maximal strength training (MST) in people with multiple sclerosis (pwMS). This pretest-posttest study examined the effects of a MST program on strength, walking, balance, and fatigue in a sample of pwMS. Seven pwMS (median EDSS 3.0, IQR 1.5) participated in a MST program twice weekly for eight weeks. Strength was assessed with 1-repetition maximum (1RM) on each leg. Walking and balance were measured with the 6-Minute Walk Test (6MWT) and Berg Balance Scale (BBS), respectively. Fatigue was measured during each week of the program with the Fatigue Severity Scale (FSS). The program was well tolerated, with an attendance rate of 96.4%. Participants had significant improvements in right leg 1RM (t6=-6.032, P=0.001), left leg 1RM (t(6)=-5.388, P=0.002), 6MWT distance (t(6)=-2.572,P=0.042), and BBS score (Z=-2.371, P=0.018) after the MST intervention. There was no significant change in FSS scores (F(1,3.312)=2.411, P=0.092). Participants in the MST program experienced improved balance and walking without an increase in fatigue. This MST program may be utilized by rehabilitation clinicians to improve lower extremity strength, balance, and mobility in pwMS.

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